CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home

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--- output omitted --- 23:23:05: ISDN BR0/0 Q921: User RX UAf sapi=0 tei=75 Router#sh isdn status Global ISDN Switchtype = basic-net3 ISDN BRI0/0 interface dsl 0, interface ISDN Switchtype = basic-net3 Layer 1 Status: ACTIVE Layer 2 Status: TEI = 75, Ces = 1, SAPI = 0, State = TEI_ASSIGNED Layer 3 Status: 0 Active Layer 3 Call(s) Active dsl 0 CCBs = 0 The Free Channel Mask: 0x80000003 Total Allocated ISDN CCBs = 0 IDREQ Identity Request transmitted from the router to the ISDN switch requesting a Terminal Endpoint Identifier (TEI). All IDREQ messages have an AI value of 127 which indicates that the ISDN switch can assign any available TEI value. IDASSN Identity Assigned message with the TEI value of 75 assigned by ISDN switch is received from the ISDN switch. SABMEp Request the connection to be in Multiple Frame Established state. SABME Asynchronous Balanced Mode Extended. UAf Unnumbered Acknowledgment (UA) of the SABME message. The ISDN Layer 2 is now in Multiple Frame Established state. - An operational and functioning ISDN circuit (Multiple Frame Established) should have periodic exchanges of RRp sapi = 0 and RRf sapi = 0 messages between the router and ISDN switch. The interval between Receiver Ready poll (RRp) and Receiver Ready final (RRf) messages is usually 10 or 30 seconds. Note: TX -> indicates that a message is generated by the router while RX
Troubleshooting ISDN Layer 3 - Only proceed to this section after ISDN Layers 1 and 2 on both ends of a circuit are verified OK. - ISDN call failures could be due to any of the following: i) Dial-on-Demand Routing (DDR) related issues. ii) ISDN Layer 1, 2, or 3 problems. iii) Point-to-Point Protocol (PPP), including authentication, Link Control Protocol (LCP), or IP Control Protocol (IPCP) related issues. - Figure A6-28 illustrates common Q.931 transactions during a successful ISDN call setup. Calling Party Called Party TE ISDN Switch ISDN Network ISDN Switch TE Time Dial Setup Call Proceeding Connect Connect ACK Data Transfer Figure A6-28: ISDN Call Setup Sequence - Pay attention to the direction of the output messages from the debug isdn q931 privileged command. The TX -> indicates that a message is generated by the router while the RX
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CCNA Complete Guide 2nd Edition Yap
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CCNA Complete Guide 2nd Edition Cop
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Upper Layers Lower Layers Applicati
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Cisco Hierarchical Model - Defined
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Header Length (4) Source Port (16)
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- Socket is a communication channel
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- The length of an IP address is 32
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- The following section discusses s
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- Below lists the 2 sublayers in th
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- Each switch port does not share t
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- Below lists the switch internal p
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Physical Layer - The physical layer
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- Another way to reduce emissions i
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Figure 3-7: Single-Mode and Multimo
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Wireless AP Switch Figure 3-8: 802.
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- Below lists the common IOS CLI er
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RT1#show running-config interface F
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- Cisco IOS treats a mistyped comma
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- Below describes the STP convergen
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- Refer back to Figure 5-1B, assume
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- A switch running RSTP only need 6
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Port Security Configuration - Port
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SW2# 00:25:00: STP: VLAN0001 new ro
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- Both protocols utilize a 12-bit V
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Layer 4 Switching (Content Switchin
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- VTP Pruning provides a way to pre
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VLAN Trunking Protocol Configuratio
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- VLAN information will not be prop
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- Private IP addresses are non-rout
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- Some materials calculate the numb
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Cisco Discovery Protocol (CDP) c250
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- CDP is enabled by default. The no
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Troubleshooting IP - Internet Contr
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- Firstly, PC1 purposely sends out
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- Below describes the operation of
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Maximum Hop Count Hop count metric
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- Invalid Timer specifies how long
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- Initial configuration on RT2: Rou
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- Static Routing configuration on R
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- RIPv1 and IGRP are classful routi
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- IGRP configuration on RT2: RT2(co
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MISC IP Routing Commands - The pass
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- OSPF uses a reliable protocol to
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- OSPF areas break up a network so
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- EIGRP uses the same formula as us
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- Autosummarization EIGRP supports
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- OSPF Single-Area configuration on
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- The show ip ospf database EXEC co
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OSPF Multiarea Configuration Area 1
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- Below lists the different termino
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- Verify the EIGRP configuration on
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- When a link to a neighbor fails,
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- Below shows the beauty of VLSM. B
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- RT1 and RT3 are summarizing route
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- RIPv1 and IGRP perform autosummar
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RT1#sh ip route Gateway of last res
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MTU and Fragmentation - Maximum Tra
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- Figure 17-1 shows the usage of CI
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- Static NAT performs one-to-one ma
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172.16.1.1 172.16.1.2 172.16.1.3 17
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- Below shows the IP NAT debugging
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- The access list indicates whether
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- Access Control List (ACL) is the
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- Below lists some other usages of
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- Standard IP Access Lists configur
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RT2#sh access-lists example01 Exten
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WAN Network RT1 CSU/DSU CSU/DSU RT2
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Remote Access Technologies - Remote
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Digital Subscriber Lines (DSL) - DS
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Point-to-Point Serial Links (Leased
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- Comparisons between synchronous a
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- PPP Encapsulation configuration o
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- The function of the username {rem
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- 3 LMI protocol options are availa
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- Comparisons between Frame Relay L
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RT1 RT2 RT3 Figure 23-7A: RT1 with
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- IETF Frame Relay encapsulation ty
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RT1 Frame Relay RT2 DLCI 101 Frame
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- The interface serialx.y point-to-
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- Frame Relay Multipoint Subinterfa
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- Rate Shifting or Adaptive Rate Se
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- By operating in the 5GHz radio ba
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- Every packet from every access po
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Virtual Interface (mandatory) Servi
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Wireless Security - Organizations t
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Wireless Management - WLANs require
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Cisco Wireless LAN Configuration -
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- ISDN offers very fast call setup
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- ISDN was designed to reuse the ex
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- ISDN PRIs are often being used fo
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- Routing protocols are unable to l
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DDR Step 4: Determining when to ter
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- The show interfaces bri{num:0 | 1
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DDR Dialer Profiles Configuration -
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- Note: IP addresses are configured
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- Below show the routing tables on
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- The configuration above defines 2
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cisco Systems, Inc. 170 West Tasman
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Catalyst Switch IOS Upgrade Procedu
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Catalyst Switch IOS Upgrade Procedu
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Cisco Router Password Recovery Proc
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Catalyst Switch Password Recovery P
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Switch> Switch>en Switch#rename con
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- The 3 possible Frame Relay PVC st
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Constructing a Compound Frame Relay
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8. Once the frame is completed, it
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Decimal Hex Binary Decimal Hex Bina
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MISC Basic Networking Notes - The m
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MISC Data Link Layer Notes - Ethern
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- The 5-4-3 repeater deployment rul
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Ethernet Autonegotiation and Duplex
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The TCP Connection States timeout s
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- Q: How does a client application
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- Urgent Data Pointer (16 bits) ind
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TCP Selective Acknowledgment (SACK)
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- Local Proxy ARP is used when ther
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Spanning Tree Protocol Port ID - Wh
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The Problem of Router-on-a-Stick Co
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Page 287 and 288: - Below configure the username and
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Page 291 and 292: - Figure A6-20 shows the frame form
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Page 299 and 300: - IPsec-based VPN is comprised of 2
Page 301 and 302: - IPsec supports the following 3 ty
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Page 305 and 306: - The authentication pre-share ISAK
Page 307 and 308: Troubleshooting ISDN E1/T1 Physical
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