Learning by Doing: CISCO Certified Network ... - SCN Research

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PAP (Password Authentication Protocol) uses passwords that are sent in clear text during a two-way handshake process (how secure is that? What is the point?) Basically a remote user requests a connection <strong>by</strong> sending a username and password request (one part of the two-way handshake) the device to be accessed then processes the information and either accepts or rejects the username and password (the other part of the two-way handshake). PAP only requests username and passwords once. CHAP (Challenge Handshaking Authentication Protocol) is similar to PAP except the username and passwords are encrypted (much better), a three-way handshake is used, and periodically CHAP re-requests usernames and passwords for authentication. With CHAP a remote user requests a connection (one part of the three-way handshake), the device to be accessed then requests a username and password (the second part of the three-way handshake), the remote user responds with the username and password (still the second part of the three-way handshake), and the device to be accessed then accepts or rejects the username and password (the third part). You will configure and “see” each of these in this lab. Step-By-Step Instructions: 1. Set up the lab and cable it as shown. Use EIGRP as your routing protocol. Use the same autonomous number for each network. Use PPP for encapsulation on the serial lines. 2. Ping from the router prompt of Terminus to Leftist and then to Urvile. It should work jiffy spiffy-like. Do a trace route between them to verify connectivity. 3. Now that we know everything works lets look at the default state of PPP (without any user names or passwords): terminus#debug ppp tasks Then disconnect the serial line for about 10 seconds and then re-connect it. You will see the LCP task negotiation and the line come back up. You should see something like: terminus# debug ppp tasks (line is disconnected) 00:52:38: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down 00:52:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down (line is reconnected) 00:52:49: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up 00:52:49: Se0/0: AAA_PER_USER LCP_UP (0x81483B3C) id 0 (0s.) queued 1/1/1 00:52:49: Se0/0: AAA_PER_USER LCP_UP (0x81483B3C) id 0 (0s.) busy/0 started 1/1/1 00:52:49: Se0/0: AAA_PER_USER LCP_UP (0x81483B3C) id 0 (0s.) busy/0 done in 0 s. 0/0/1 00:52:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up 377
Let’s look at what is happening here <strong>by</strong> “cleaning up our debug” a bit: terminus# debug ppp tasks (line is disconnected) Line protocol on Interface Serial0/0, changed state to down (line is reconnected) Interface Serial0/0, changed state to up AAA_PER_USER LCP_UP AAA_PER_USER LCP_UP AAA_PER_USER LCP_UP Line protocol on Interface Serial0/0, changed state to up We can see that when our line is disconnected no “task” packets are communicated over the ppp line. But we do have LCP task packets being communicated when the line comes back “up.” Remember our PPP five step process: line is reconnected, LCP is negotiated, any username/passwords are verified, NCP is negotiated, line comes up and communication takes place, and the session is terminated. With the debug tasks we can only see LCP packets. Next we can look at the actual negotiation steps with debug. Be sure to turn off all debugging so we get a “clear” debug ppp negotiation. You should see: terminus#undebug ppp tasks PPP background processing debugging is off terminus#debug ppp negotiation PPP protocol negotiation debugging is on (line is disconnected) 00:54:27: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down 00:54:27: Se0/0 IPCP: State is Closed 00:54:27: Se0/0 CDPCP: State is Closed 00:54:27: Se0/0 PPP: Phase is TERMINATING 00:54:27: Se0/0 LCP: State is Closed 00:54:27: Se0/0 PPP: Phase is DOWN 00:54:27: Se0/0 IPCP: Remove route to 200.200.200.2 00:54:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down (line is reconnected) 00:54:36: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up 00:54:36: Se0/0 PPP: Treating connection as a dedicated line 00:54:36: Se0/0 PPP: Phase is ESTABLISHING, Active Open 00:54:36: Se0/0 LCP: O CONFREQ [Closed] id 3 len 10 00:54:36: Se0/0 LCP: MagicNumber 0x04158C08 (0x050604158C08) 00:54:36: Se0/0 LCP: I CONFREQ [REQsent] id 4 len 10 00:54:36: Se0/0 LCP: MagicNumber 0x01C88BB2 (0x050601C88BB2) 00:54:36: Se0/0 LCP: O CONFACK [REQsent] id 4 len 10 00:54:36: Se0/0 LCP: MagicNumber 0x01C88BB2 (0x050601C88BB2) 00:54:36: Se0/0 LCP: I CONFACK [ACKsent] id 3 len 10 00:54:36: Se0/0 LCP: MagicNumber 0x04158C08 (0x050604158C08) 00:54:36: Se0/0 LCP: State is Open 00:54:36: Se0/0 PPP: Phase is UP 378
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Learning by Doing: CISCO Certified
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About the Author Matthew Basham is
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Acknowledgements Preface Table of C
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Basic Access Control Lists 342 Exte
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Searching CISCO for CCNA Test infor
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Figure 5—Scroll down to CCNA exam
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Objective: This lab is designed to
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g. If you really have some time to
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C:\ |___CDDROM\ |___MY_Documents\ |
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Sometimes we do not always know or
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find format keyb label mode more nl
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WINREP.EXE WINFILE.EXE WINHELP.EXE
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pause copy c:\temp\matt.txt c:\temp
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Cool Windows 95/98 Utilities KRNL38
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Changing TCP/IP Settings on Your Co
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Gateway Tab Figure 4—Putting in a
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Paper Lab: ICONS for Computer Diagr
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CISCO Net Ranger—CISCO security d
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Laptop—ditto. File server—Used
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Firewall—Network Address Translat
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Paper Lab: Proper Cable for the Pro
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Rollover (ro): Used for connecting
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Change hubs to switches: 38
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Add in a web access: DSU/CSU WWW 40
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4. Click on the file and print shar
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Figure 7—Selecting the options fo
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You should see something like this:
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purpose. Check your documentation.
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Now along the column headings we se
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Let’s try another one: 223. Start
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Then, using a different color marke
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Let me just walk through one more
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2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 128
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For example, lets convert the binar
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To convert a large hexadecimal numb
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Network Data Link Physical Provides
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Encapsulation As we move down the O
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Session Transport Network Data Link
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Objective: To be able to learn more
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There are all kinds of other topolo
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Supplemental Lab or Challenge Activ
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The Start of Frame Delimiter (SOF)
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The Control (con) is 1 byte long an
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The Options (Opt) field can vary in
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only one port at a time. The hub al
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1 3 5 7 Workstation Workstation Wor
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Supplemental Labs or Challenge Acti
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9. Collision Domains: ____________
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Paper Lab: Subnetting Objective: To
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12. Routers pass packets between __
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2. Which of the following dotted no
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18. Select the IP address for the s
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12. What is the decimal to binary c
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4. How many possible subnets can be
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16. How would the host field be exp
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Subnet masking 1. How would the sub
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Whole enchilada problems 1. Which o
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Objective: To learn how to design n
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Subnetting Example: John’s Brewho
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Intermediate DOS Lab: Troubleshooti
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7. We know we have good connections
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DHCP Lab Objective: To learn about
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5. Notice how our address may diffe
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Free Protocol Inspector Objective:
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Objective: To learn how to use a pr
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Notice how we have three frames wit
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5. Type cd pub to change to the pub
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Protocols and the OSI Model Objecti
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DECnet Suite OSI Model 7 Protocol 6
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Layer 2 Technologies: LAN’s OSI M
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Supplemental Labs or Challenge Acti
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Once you click “connect” you sh
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Fun Ports to Surf with Telnet To op
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6. Make sure you have the following
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(Step 1) Configure a connection on
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. Double-click on “dial-up networ
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Step-By-Step Instructions: 1. You a
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Figure 5d—Isn’t that nice? 4. C
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Your Modem and You Objective: This
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AT&F load factory defaults and sett
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Part 2: Basic Routing I 154
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More importantly to you right now i
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Ethernet Console AUX Power Power Po
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Objective: To become familiar with
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9. Write down what you see on the w
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outer#terminal history size 5 17. U
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Other modes you may use include: co
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Objectives: To more fully understan
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So let’s look at a boot sequence
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Step-by-Step Instructions: 1. Hook
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NVRAM Flash RAM/DRAM ROM CPU Serial
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Basic Router Configuration Objectiv
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8. Once you have determined that yo
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Basic Rip Objectives: To learn abou
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It’s ok if you see it, but you pr
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Gateway of last resort is not set C
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Step-by-Step Instructions: 1. Troub
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Input queue: 0/75/0 (size/max/drops
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1 192.168.30.2 16 msec 16 msec * Ra
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5. Finally, do not forget about tho
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Loopback Interfaces Objectives: To
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2. We can use a loopback interface
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C:\WINDOWS\Desktop>ping 22.22.22.22
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Basic RIP with Protocol Inspector O
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5. Wait two minutes. Remember, you
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Router Telnet Lab Objective: To lea
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william#debug telnet Incoming Telne
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Addressing: Routers Hostnames Phibe
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On Optik you should see: optik#debu
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Scenario 3: Hostnames Phiber Optik
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5. Setup the workstations with IP a
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RIP metrics and the Limitations of
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Interface Send Recv Key-chain Ether
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Step-by-Step Instructions: 1. Cable
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Subnetting with DHCP Objectives: To
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Objective: To learn how to implemen
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So What Have I Learned Here? In thi
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Workstations A B IP 161.20.2.2 161.
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Now let’s explore some of the oth
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Overcoming Problems with Routing Lo
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RIP Version 2 and Redistribution wi
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9. Use your knowledge of debug comm
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Prompt Command Shortcut Description
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Design a network using VLSM and the
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Troubleshooting scenarios for Part
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Switch Maintenance Objective: In th
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Remember how we just put in a passw
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Just click on “yes” to clear th
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Step-By-Step Instructions: 1. You s
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Figure 2—STP showing cost of 10.
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Intermediate STP Objective: To be a
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connection to the root switch. That
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8. Change the cost of port 7 back t
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4. Now we need to assign ports to t
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c. Click on [A] for add a VLAN (thi
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Mixing it up: VLAN’s with STP Obj
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Subnetting Example: ABC Packaging O
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4. Stop the capture. You should see
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Part 3 Command Review Objective: To
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Whole Enchilada/Crazy Insano Lab #1
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Paper Lab: CISCO Three-Layer Hierar
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Protocol Deathmatch: RIP versus RIP
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company and control access between
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Step-By-Step Instructions: 1. Set u
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Guest Router Name Derivation In 199
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Workstations A B IP 200.150.100.2 2
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I 202.150.100.0/24 [100/8576] via 2
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Here we can see the entry for netwo
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Redistribution of IGRP and RIP Obje
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3. Now we can see how this affects
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dennis(config)#router rip dennis(co
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Gateway of last resort is not set I
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to add the extra metrics statements
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7. Notice the reachable/not reachab
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(VLSM/CIDR). OSPF on a wider scale
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wash# leung#sh ip ospf Routing Proc
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Border Gateway Protocol (BGP) Objec
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3. Let’s add in the BGP. It too u
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BGP table version is 24, local rout
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What time interval for each protoco
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Basic IP/IPX with Dynamic Routing O
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Page 336 and 337: gibson#debug ipx sap ? activity IPX
Page 338 and 339: IPX Lab Diagram: network 100 enc SA
Page 340 and 341: 7. Now let’s try that ping IPX ag
Page 342 and 343: Objective: To learn how to create w
Page 344 and 345: Paper Lab: Access Control Lists Obj
Page 346 and 347: Now we just need to do the second s
Page 348 and 349: Now let’s try to “free-hand”
Page 350 and 351: 4. Make four text files and put one
Page 352 and 353: 10. Try the shortcut to the 192.168
Page 354 and 355: Objective: To implement an extended
Page 356 and 357: 8. Now let’s try the show access
Page 358 and 359: Objective: To implement a named acc
Page 360 and 361: Supplemental Lab or Challenge Activ
Page 362 and 363: actually build a mini-protocol insp
Page 364 and 365: Log Buffer (4096 bytes): 00:27:14:
Page 366 and 367: Firewall Basics using Reflexive ACL
Page 368 and 369: 7. Even though that ACL works let
Page 370 and 371: Prompt Command Shortcut Description
Page 372 and 373: Whole Enchilada/Crazy Insano Lab #2
Page 374 and 375: Registering for Your CCNA Exam Obje
Page 376 and 377: 3. Configure the router to receive
Page 378 and 379: Point-to-Point Protocol (PPP) Objec
Page 380 and 381: MTU 1500 bytes, BW 128 Kbit, DLY 20
Page 382 and 383: So what have I learned here? In thi
Page 386 and 387: 00:54:36: Se0/0 IPCP: O CONFREQ [Cl
Page 388 and 389: 4. Let’s turn off debugging. Use
Page 390 and 391: 20. 01:24:46: Se0/1 LCP: MagicNumbe
Page 392 and 393: “real-world” scenario. Undo all
Page 394 and 395: Remote Access DUN with PPP Encapsul
Page 396 and 397: lord(config)#ipx routing 0000.BBBB.
Page 398 and 399: Setting up a Router to be a Frame R
Page 400 and 401: Objective: To learn how to set up a
Page 402 and 403: turner#sh frame-relay pvc PVC Stati
Page 404 and 405: Step-By-Step Instructions: 1. Cable
Page 406 and 407: Fully-Meshed Frame Relay with 3 Rou
Page 408 and 409: Shadow 16 17 18 18 Diekman 17 16 Kn
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Page 412 and 413: Frame Relay Operation and Troublesh
Page 414 and 415: network we will see all but our own
Page 416 and 417: 7. Wrong ip address/mask Here I jus
Page 418 and 419: outer#sh frame map Serial0/0 (up):
Page 420 and 421: 3. Configure the ISDN interface on
Page 422 and 423: Challenge Lab or Supplemental Activ
Page 424 and 425: 3. Configure the ISDN interface on
Page 426 and 427: 00:21:08: %LINEPROTO-5-UPDOWN: Line
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Type escape sequence to abort. Send
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36. IPCP: Install route to 192.168.
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Last C/I to ISDN transceiver: AI:Ac
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kissane#sh controller bri BRI unit
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05:04:35: BR0/0:2 DDR: disconnectin
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Type escape sequence to abort. Send
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Sending 5, 100-byte ICMP Echos to 1
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kissane#debug ppp nego PPP protocol
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kissane#debug ppp nego PPP protocol
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06:47:25: BR0/0:1 PPP: Treating con
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Step-By-Step Instructions: 1. Confi
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7. Try to ping the loopback. You sh
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Frame Relay with ISDN Backup Object
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So what have I learned here? In thi
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Prompt Command Shortcut Description
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Coming In the Next Version of the T
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Did you like this book? There’s m
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