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Figure 2.2. The IP header. • Version—This field defines which IP version created the datagram so that all parties involved with handling the datagram know its proper formatting. IPv4 is the current standard. This field will become more and more significant as IPv6 begins to be implemented in the next few years. The field is 4 bits in size. • IHL—The Internet Header Length (IHL) field describes the total length of the IP datagram header. The field has a maximum size of 4 bits. • ToS—The Type of Service (ToS) field is an 8-bit field that provides the capability to define the preferred service treatment. The ToS field might not be used by every hardware or software platform. • Total Length—This field describes the total size of the datagram, including both the IP header and the ULP data. The size of the field is 16 bits, which is expressed in octets (8 bits). There is no limitation on maximum or minimum datagram size. The size is limited by the specifications of the Layer 2 transport medium (Ethernet, for example). • Identification—This value tells the destination host what part of the data fragment is contained in the datagram data payload. The ULP or IP can generate the value. The ID field is 16 bits long. • Flags—This 3-bit field indicates whether fragmentation is permitted. If the "Don't Fragment" flag is on, fragmentation is not possible. If the "More Fragment" flag is on, fragmentation is used in conjunction with the packet ID to determine how to reassemble the datagram fragments. • Fragment Offset—This field is used to determine what part of the fragmented data contained in the datagram is being carried relative to the original nonfragmented datagram. The first datagram fragment and a complete nonfragmented datagram have this set to off (zero). The maximum size for this field is 13 bits. • TTL—The Time to Live (TTL) field is IP's way of destroying undeliverable data. A datagram has a maximum life span of 4.25 minutes, after which the packet is discarded. When the datagram is sent, the hop counter is set to 255. This number is decreased by 1 for each router that handles the datagram. This field is 8 bits long.
• Protocol—This field provides information about the data contained in the data portion of the datagram. The field is 16 bits long. • Header Checksum—This field contains the checksum for the IP datagram header. It is recomputed at each route point to accommodate for the decrement to the TTL field. The recomputation allows the IP header information to be validated as correct. Datagrams that fail the checksum are discarded. The field is 16 bits long. • Source Address—This field contains the address of the host that originated the datagram. The field is 32 bits long. • Destination Address—This field contains the address of the host to which the datagram is to be delivered. The field is 32 bits long. • Options—This field is optional and has no specified size. It is used for both defined special options and as a means for making modifications to the IP header for testing and development purposes. • Padding—This field is used to add any additional bits that may be needed to make the header meet an adequate size for transmission. IP Datagram Fragmentation IP fragmentation provides the capability for IP datagrams to be sent across various types of networks that have different limitations on the size of their transport frames. Because the IP datagram is appended to an ULP message, the size of an IP datagram varies. Different transmission media have different message size limitations; in order to deliver an IP datagram over these different types, IP needs the ability to fragment a large ULP protocol message into smaller pieces that can be accommodated by the Layer 2 transmission medium. Layer 2 protocols transmit Layer 3 data in frames. Each Layer 2 protocol (Ethernet, FDDI. X.25, Frame Relay, and so on) has specifications for the size of the frames it can support. This value is known as the Maximum Transmission Unit (MTU). The MTU is expressed in bytes, and, along with the Layer 3 data, must also contain the needed data required for the frame to be processed correctly. Because modern networks are made up of network segments of varying speeds, IP's capability to fragment itself into different MTUs is an important necessity. In order to ensure this variability, IP provides mechanisms for managing fragmentation and reassembly. Fragmentation is performed by the gateway that needs to route the datagram over interfaces with incompatible MTUs. The gateway first fragments the original datagram into datagram fragments. These fragments are then delivered to the destination host where they are reassembled. Because IP provides no facility to guarantee datagram delivery or the order in which they are delivered, the destination host must cache the datagrams until all the fragments arrive, and then reassemble them.
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Understanding the Network A Practic
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IOS Authentication and Accounting S
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About the Reviewers These reviewers
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Tell Us What You Think As the reade
Page 10 and 11: mostly dealt with interconnecting m
Page 12 and 13: • A short introduction to SNMP Ap
Page 14 and 15: In theory, a computer network can o
Page 16 and 17: Coaxial cable has a single solid co
Page 18 and 19: • Radio transmission—It is achi
Page 20 and 21: • Baseband transmission applies t
Page 22 and 23: Ring Topology Figure 1.3. The bus t
Page 24 and 25: Packets and frames are often used a
Page 26 and 27: Asynchronous transmission involves
Page 28 and 29: Figure 1.6. Collision handling unde
Page 30 and 31: In a ring topology, a token is pass
Page 32 and 33: Repeaters The repeater was introduc
Page 34 and 35: the network. If your 50-node networ
Page 36 and 37: Figure 1.12. A collection of nodes
Page 38 and 39: their destination, type, and conten
Page 40 and 41: shop, you are using Novell's Direct
Page 42 and 43: Figure 1.14. The OSI and Internet r
Page 44 and 45: Layer 7: Application This layer pro
Page 46 and 47: end-to-end, sequenced data delivery
Page 48 and 49: outer, the delivery path might be d
Page 50 and 51: and network transport is a very imp
Page 52 and 53: Figure 1.16. The "bottom up" commun
Page 54 and 55: Chapter 2. The Networker's Guide to
Page 56 and 57: Internet Society, a nonprofit organ
Page 58 and 59: • First, it performs translations
Page 62 and 63: To assist in the reassembly process
Page 64 and 65: Figure 2.3. IP address classes comp
Page 66 and 67: taking the natural mask of the addr
Page 68 and 69: Classful Subnetting Examples The im
Page 70 and 71: 21 2,000 8,000 255.255.248.0 22 1,0
Page 72 and 73: classful-based address space model.
Page 74 and 75: Table 2.6. Classless Network Addres
Page 76 and 77: NOTE Because CIDR is used for addre
Page 78 and 79: will connect in the future, it is b
Page 80 and 81: Routers are also called intermediat
Page 82 and 83: IP datagrams for which the local ho
Page 84 and 85: 1. The Layer 3 to Layer 2 address m
Page 86 and 87: 3. Router B—Router B receives the
Page 88 and 89: connected networks. Figure 2.11 ill
Page 90 and 91: Figure 2.12. A simple regional (ISP
Page 92 and 93: gw1, gw2, gw4 3 gw1, gw3, gw4 3 gw1
Page 94 and 95: Dynamic routing might not be requir
Page 96 and 97: The transport layer as a whole repr
Page 98 and 99: window to reflect changes in the pa
Page 100 and 101: The TCP Header The TCP header provi
Page 102 and 103: 53 DNS (Domain Name Service) 67 BOO
Page 104 and 105: SNMP Simple Network Management Prot
Page 106 and 107: uses both TCP and UDP for service d
Page 108 and 109: RFC 974 Mail routing and the domain
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Figure 3.1. Physical versus logical
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Figure 3.2. The AppleTalk protocol
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AppleTalk Address Resolution Protoc
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of 400 microseconds, in addition to
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Along with the SAP, there is a 5-by
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delivery is a best-effort delivery
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• DDP checksum (long header only)
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eachable within the internetwork. T
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information from the router's other
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AppleTalk Update Based Routing Prot
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• type is the service classificat
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application layers. AppleTalk has n
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Figure 3.10. ZIP message formats. E
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Printer Access Protocol Printer Acc
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Figure 3.11. Novell (IPX) protocol
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The other nodes on the network that
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Figure 3.13. IPX datagram format.
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the cumulative information gleaned
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• Hop Count is the number of rout
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Upper Layer Protocols IPX is used t
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Msg.Add.Name Adds a unique name to
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Related RFCs RFC 1001 RFC 1002 RFC
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service enhancement or replacement
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Figure 4.1. The LLC interfaces in r
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it does not provide for error recov
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and smooth pattern flow enables MTL
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cabling, backbone length 800m Categ
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combination of light refraction and
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NOTE Cladding is the glass "shell"
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Ethernet The original Ethernet prot
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UTP telephone cabling infrastructur
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Since the introduction of the IEEE
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In the event that two Ethernet end-
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The 802.3 frame type used in Figure
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• Frame check sequence (4 bytes)
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• Physical layer signaling (PLS)
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cable segment length (for coaxial s
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transmission medium using BNC (Brit
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Figure 4.12. A basic 3-cable 10Base
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Figure 4.14. 10Base-T hub-to-hub in
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Figure 4.16. 10Base-T in a consulta
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• Support for full-duplex operati
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mechanisms, in terms of encoding an
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etween different PHY encoding imple
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100Base Ethernet) is based on the p
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The Gigabit PHY The Gigabit PHY con
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CSMA/CD is sensitive to operating r
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The main advantage of using FDR ove
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have to transmit against the priori
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• Ring timing maintenance—The A
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check the lobe cable. If the lobe t
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Token Ring addresses are expressed
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• Report Active Monitor Error (RA
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they first join the ring or in the
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Figure 4.22. The IBM type 1 MIC con
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FDDI Work on the Fiber Distributed
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However, all this comes at a cost,
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Figure 4.25. FDDI MAC data frame an
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topologies needed for the transmiss
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Chapter 5. WAN Internetworking Tech
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Placing a Call The functional model
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LATAs to provide local exchange ser
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The PSTN was originally designed fo
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sampling rate is 8,000 times per se
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Figure 5.1. A multiplexer from a lo
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Table 5.1. The American (DS) and In
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The M24/D4 frame standard is the ba
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contains consecutive ones and zeros
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• Line loopback/line build-out (L
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process. The T3 multiplexer adds st
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committee. The committee provided t
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The photonic layer defines the elec
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such as T1/E1, FDDI, and others. Th
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SS7 signaling components are connec
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SCCP operates as an OSI-RM Layer 3.
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WAN point-to-point links. It can be
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Figure 5.11. The ISDN protocol refe
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• The R interface acts as a point
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• Flag—This is an 8-bit (011111
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terminals attached to the ISDN swit
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X.25 networks are comprised of four
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Frame Relay, like the ISDN effort i
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• Flag—This functions as a fram
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Figure 5.17. the B-ISDN reference m
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environments is implemented using A
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endpoints. A Virtual Path Link (VPL
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ATM endpoints. The user adaptation
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1. The ATM end-device issues a setu
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Data-Link Framing Point-to-point de
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PPP PPP can provide multiprotocol d
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PPP Framing There are three HDLC fr
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• The HDLC and PPP data-link prot
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Chapter 6. Network Switches In this
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Figure 6.1. Partial and full mesh m
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protocol. Figure 6.3 illustrates th
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All hosts can see the traffic that
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To get a better understanding of th
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Figure 6.5. A bridged LAN with span
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support a path discovery method. So
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or performance limitations, network
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network data encryption, WAN reacha
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The Impact of Switching on Traditio
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• Switch backplane—Also referre
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Switch Port Flow Control In full-du
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In the event that the primary trunk
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Figure 6.9. Layer 2 collision domai
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Figure 6.10. Multiport repeaters an
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Figure 6.11. Distributed and collap
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utilization performance. To calcula
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Ideally, the goal of all switch and
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Cut-through uses the same technolog
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VLANs A switch that supports VLAN p
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MAC Address-Based VLANs Another com
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Figure 6.13. Switches running indep
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The configuration layer uses the Ge
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Layer 2 infrastructures to operate
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need. This method not only allocate
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transmitting and receiving. Without
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ATM-specific applications would be
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ATM private-class switches are comp
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Because both the VPI and VCI are us
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environment. The goal is to have La
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Broadcast and Unknown Server The Br
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Figure 6.15. An LEC and its VCC rel
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ATM hosts are accomplished by estab
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• VLANs • Full-duplex switch po
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Chapter 7. Introduction to Cisco Ro
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The 4000 series routers come in a t
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series routers, this partition can
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need to crimp the CAT 5 strands fol
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Use the cable set to build the cabl
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Step 2. This command specifies whic
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AppleTalk FDDI IPX Token Ring VINES
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The IOS Command Line and Configurat
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disconnect Disconnect an existing n
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changes (user to privileged, for ex
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• Router(config)#hostname test-ro
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or • On 7x00 only, use: • •
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Null Null interface Tunnel Tunnel i
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Router(config)#ip rou? route routin
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Ctrl+P, up arrow Previous command i
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mop Copy from a MOP server (not ava
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Now let's see what is on the PCMCIA
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When copying any file, unless no pr
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Ethernet LANs with a dedicated T1 c
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Compiled Fri 03-Apr-98 07:00 by rna
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172.16.2.0 /25 172.16.2.128 /26 or
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Ridge-GW(config)# ip route 0.0.0.0
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In addition to their native protoco
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D - EIGRP, EX - EIGRP external, O -
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Configuring Dumb Terminal Service T
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Ctrl+Shift+6+X suspends a session).
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cornpops|Printer on Cisco termserve
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Concord-GW(config-if)#flowcontrol h
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The AUX port configuration for Ridg
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outer and enter the break sequence
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Setting the conf-reg Value in ROM M
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• Register setting 0x2010—Confi
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8. 9. Router#configure terminal 10.
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Router#config t Enter configuration
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-#- ED --type----crc--- -seek--nlen
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to xmodem or TFTP (2600 only) an IO
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Mountain Standard Time (MST) -7 Pac
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eference time is BB0FC7AA.95E93186
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in production for a little while. T
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use debug mode often. When using th
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uucp UNIX-to-UNIX copy system IOS a
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Log Management Logs are useless unl
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IOS Authentication and Accounting I
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hostnames (which can be corrected w
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$telnet 192.160.56.5 Trying 192.160
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In this example, the authentication
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makes it easier to configure, becau
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define what authentication type sho
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Caution should be taken when using
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pairs (similar to those used to cre
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• Using rommon and disaster recov
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In the following section, we review
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Deciding to Use a Routing Protocol
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Now, here is the qualifier: Not eve
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If RIP was the routing protocol for
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Distance Vector Protocols All routi
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space) based on a power of 2. Class
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address space), but you would run i
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destination address that falls with
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the different IP address spaces int
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Weaknesses of Static Routing Static
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Today, RIP is considered by some to
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RIP 192.124.32.0 /24 192.124.35.1 3
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All routers on the network keep tra
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RIP's Value Today RIP is old, it's
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• Better reliability—OSPF route
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Figure 8.10. Single- and multi-area
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• Internal routers—These router
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to the backbone. In Figure 8.13, al
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Figure 8.14. OSPF router designatio
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oundary routers. They describe netw
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outer's point of view. The path con
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Autonomous Systems and Exterior Rou
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Figure 8.16. The IGP to ERP handoff
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Figure 8.17. The BGP finite state m
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EGPs have been increasing in popula
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Chapter 9. Advanced Cisco Router Co
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specified ACL number range. Table 9
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default, all traffic is denied. Onl
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asbr-a2#config t Enter configuratio
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trying to build ACLs with the comma
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trace Multicast trace IGMP log Log
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Tftp Trivial File Transfer Protocol
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access-list 100 permit tcp any 172.
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Table 9.5. AppleTalk ACL Filtering
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Figure 9.1. The AnyCo corporate App
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One word of caution: If you plan to
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You can also log hits on ports by a
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Table 9.8. Route-Map Operators for
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exists, a group identifier (which c
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hegel# With this configuration, bec
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NAT is commonly used in a fashion s
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The [prefix-length] or [netmask] se
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NAT's Shortcomings Although NAT is
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NOTE Administrators beware: Tunneli
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connects, the active key informatio
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encapsulation, framing, and line si
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asbr-a2(config-if)#ip address 172.1
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problem if you are provisioning ISD
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22:41:34: %LINK-3-UPDOWN: Interface
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POP mail request is made. Now let's
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leibniz(config-if)#backup interface
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When the primary link fails, the BR
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1.544Mbps. The actual transport lin
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the cost-effective and bandwidth-ef
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interface configuration subcommand
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it is possible to exchange packets
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interface serial0.2 point-to-point
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Figure 9.6. A multipoint FR example
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2. ATM encapsulation must be enable
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are commonly used in large-scale cl
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persephone(config)#interface atm 3/
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• The creation and application of
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Chapter 10. Configuring IP Routing
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After you have a list of requiremen
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Control commands: Displaying
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not active, it is quite common for
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Incoming update filter list for all
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When changing any IP routing behavi
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asbr-a1(config-if)#^Z asbr-a1# When
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For asbr-a2 to reach all the testne
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192.168.160.0/30 is subnetted, 1 su
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order to maintain computability wit
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Configuring Dynamic IGP and EGP IP
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passive-interface s1 By enabling th
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asbr-a1(config-router)#network 12.0
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To verify that the adjusted route m
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The command is a general routing p
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EIGRP, as I'm sure you have guessed
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No matter how the announcement entr
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Incoming update filter list for all
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is adjustable using the router con
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• IOS also supports various debu
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outers: • Backbone Routers—Thes
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process. The router would construct
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e1/1 192.168.9.0 fe0/0 192.168.0.0
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An alternative to this is to use th
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C 192.168.191.0/24 is directly conn
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Link State Age Interval is 00:20:00
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C 192.168.191.0/24 is directly conn
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to asbr-a1 was a remote office that
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interface Serial1 ip address 192.16
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which to exchange OSPF messages. Th
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OSPF Monitoring Commands Throughout
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• • • NOTE • will display
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Figure 10.4. AURP tunnel interfaces
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appletalk glean-packets hostname as
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For many users, the usefulness of B
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internal/Internet access router whe
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externally destined traffic arrives
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Routers asbr-a1/a2 and asbr-b1/b2 a
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BGP Reflectors An alternative to ha
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network 192.168.0.0 mask 255.255.25
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dynamic routing protocols are used
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Figure 10.8. An example network run
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Controlling Redistribution In some
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hostname ABR-a57 ! access-list 1 pe
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access-list 2 deny 10.0.1.0 access-
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Keep in mind that route-maps, li
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Chapter 11. Network Troubleshooting
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However, the most valuable tool of
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• Description of primary function
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of cable fault, different CSFSs are
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For Windows Systems, check out the
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command. On a Windows NT system, us
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#Do not change these variables logf
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# If any of the hosts fail to respo
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upgrade. So, when the time comes to
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throughput over time, instead of si
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protocol is the most prone to perfo
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NOTE When looking at network broadc
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NOTE Another common network error n
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and the physical ring segment that
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tolerances the frames, timing shift
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practical terms, this means that at
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etransmissions, however, usually ha
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4. Don't get lost in the big pictur
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• Link and services monitoring, n
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eports on network utilization, avai
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o Bandwidth utilization rates o Rat
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and improved management capabilitie
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After the supported SNMP version is
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Table 11.3. ASN.1 Keywords Used wit
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application-wide tags, which are us
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TestSequence ::= SEQUENCE { example
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The MIB-2 and RMON-MIB modules are
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iso.identfied-orgnaization.dod.inte
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accepted values are getRequest, get
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Spectrum is available in both UNIX
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Figure 11.8. Windows NT 4.0 SNMP Ag
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To access any of the NT SNMP agent
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The installation of the SNMP agent
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Figure 11.13. The Windows 95/98 Sel
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Figure 11.15. Locating the Windows
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Figure 11.17. The SNMP configuratio
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2. Scroll to Network Connectivity o
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sysLocation information, go to the
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example that just implements the ba
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protocol, service, and application
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RFC 1089 RFC 1147 RFC 1155 RFC 1157
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Appendix A. Binary Conversion Table
show all

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