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

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Overcoming Problems with Routing Loops Objective: To understand the problems routing loops can cause in a network and how to overcome those problems. Tools and Materials: (3) PC/workstations (3) Routers (3) Switches (6) Straight-through cables (3) DCE serial cable (3) DTE serial cable (3) rollover cables Lab Diagram: Addressing: Workstation “A” Workstation “B” Workstation “C” Routers Hostnames Prophet Knight Lightning E0 172.16.1.1/16 172.16.2.1/16 172.16.3.1/16 S0 10.1.1.1/24 (DCE) 10.2.1.1/24 (DCE) 10.3.1.2/24 (DTE) S1 10.3.1.1/24 (DTE) 10.1.1.2/24 (DTE) 10.2.1.2/24 (DTE) Workstations a b IP 172.16.1.2/16 172.16.2.2/16 172.16.3.2/16 SM 255.255.0.0 255.255.0.0 255.255.0.0 GW 172.16.1.1 172.16.2.1 172.16.3.1 Step-by-Step Instructions: 1. Cable the lab as shown except for the serial line between Prophet and Lightning. 2. Complete the basic router setup on each router. 3. Configure the interfaces on each router. 4. Configure the routing protocol and advertise the router’s networks. 235
5. Setup the workstations with IP address, subnet masks, and gateways addresses. You will need to reboot the workstations. If they ask for a password for network connectivity just put anything in and you should see a message something like “no domain server is available, you may not have some networking functions.” It’s ok if you see it, but you probably will not be able to ping outside of your workstation without seeing that error message. 6. Test connectivity from workstation A to workstation C. 7. Turn on debug ip rip on each router. 8. Now let’s add in that other serial line between Prophet and Lightning. This will create a routing loop in our network. By default CISCO routers are prepared for routing loops. To create a problem with a routing loop use this command: prophet(config)#interface s0/0 prophet(config-if)#no ip split-horizon 9. You should see lots of debug messages about routing loops now. To stop those routing loop problems type “ip split-horizon” again on the serial interface or just disconnect that serial line. This problem is known as “counting to infinity.” Supplemental Lab or Challenge Activity: 1. You can also solve the problem of routing loops by changing the metrics for the routing protocol. Having just completed the lab on RIP metrics, try this lab again changing the metrics for RIP from 16 hops to 3 and see what happens. 2. Define and differentiate between split-horizon, poison reverse update and count to infinity. More than likely you will see a question about these on your test. So What Have I Learned Here? In this lab you learned that problems with routing loops are automatically taken care of by the ip split-horizon command in your router. Why did we bother learning about it? Well no network is pure and chances are you will have routers from other vendors in your network. No all of them automatically eliminate routing loop problems so you need to be aware of them. Guest Router Name Derivation In September 1998 a hacker known as “Prophet” (Robert Riggs) cracked the BellSouth network and downloaded copies of operating manuals to his own computer and copied them to a BBS. He also sent them to another hacker “Knight Lightning” (Craig Neidorf) who published the information in his underground electronic magazine “Phrack.” Prophet pled guilty to wire fraud. Knight Lightning fought his case because he had only taken a copy of the document and “didn’t hurt anything.” It turned out the document was also available for sale from Bellsouth, but Knight Lightning was still left with a six-figure legal bill for a document he could have purchased legally for $13.00 and Prophet has a criminal record. 236
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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
Page 192 and 193: Gateway of last resort is not set C
Page 194 and 195: Supplemental Lab or Challenge Activ
Page 196 and 197: Step-by-Step Instructions: 1. Troub
Page 198 and 199: Input queue: 0/75/0 (size/max/drops
Page 200 and 201: 1 192.168.30.2 16 msec 16 msec * Ra
Page 202 and 203: 5. Finally, do not forget about tho
Page 204 and 205: Loopback Interfaces Objectives: To
Page 206 and 207: 2. We can use a loopback interface
Page 208 and 209: C:\WINDOWS\Desktop>ping 22.22.22.22
Page 210 and 211: Basic RIP with Protocol Inspector O
Page 212 and 213: 5. Wait two minutes. Remember, you
Page 214 and 215: Router Telnet Lab Objective: To lea
Page 216 and 217: william#debug telnet Incoming Telne
Page 218 and 219: Addressing: Routers Hostnames Phibe
Page 220 and 221: On Optik you should see: optik#debu
Page 222 and 223: Scenario 3: Hostnames Phiber Optik
Page 224 and 225: 5. Setup the workstations with IP a
Page 226 and 227: RIP metrics and the Limitations of
Page 228 and 229: Interface Send Recv Key-chain Ether
Page 230 and 231: Step-by-Step Instructions: 1. Cable
Page 232 and 233: Subnetting with DHCP Objectives: To
Page 234 and 235: Objective: To learn how to implemen
Page 236 and 237: So What Have I Learned Here? In thi
Page 238 and 239: Workstations A B IP 161.20.2.2 161.
Page 240 and 241: Now let’s explore some of the oth
Page 244 and 245: RIP Version 2 and Redistribution wi
Page 246 and 247: 9. Use your knowledge of debug comm
Page 248 and 249: Prompt Command Shortcut Description
Page 250 and 251: Design a network using VLSM and the
Page 252 and 253: Troubleshooting scenarios for Part
Page 254 and 255: Switch Maintenance Objective: In th
Page 256 and 257: Remember how we just put in a passw
Page 258 and 259: Just click on “yes” to clear th
Page 260 and 261: Step-By-Step Instructions: 1. You s
Page 262 and 263: Figure 2—STP showing cost of 10.
Page 264 and 265: Intermediate STP Objective: To be a
Page 266 and 267: connection to the root switch. That
Page 268 and 269: 8. Change the cost of port 7 back t
Page 270 and 271: 4. Now we need to assign ports to t
Page 272 and 273: c. Click on [A] for add a VLAN (thi
Page 274 and 275: Mixing it up: VLAN’s with STP Obj
Page 276 and 277: Subnetting Example: ABC Packaging O
Page 278 and 279: 4. Stop the capture. You should see
Page 280 and 281: Part 3 Command Review Objective: To
Page 282 and 283: Whole Enchilada/Crazy Insano Lab #1
Page 288 and 289: Paper Lab: CISCO Three-Layer Hierar
Page 290 and 291: 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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gibson#ping ipx 0000.1234.1111 % Un
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gibson#debug ipx sap ? activity IPX
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IPX Lab Diagram: network 100 enc SA
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7. Now let’s try that ping IPX ag
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Objective: To learn how to create w
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Paper Lab: Access Control Lists Obj
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Now we just need to do the second s
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Now let’s try to “free-hand”
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4. Make four text files and put one
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10. Try the shortcut to the 192.168
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Objective: To implement an extended
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8. Now let’s try the show access
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Objective: To implement a named acc
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actually build a mini-protocol insp
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Log Buffer (4096 bytes): 00:27:14:
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Firewall Basics using Reflexive ACL
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7. Even though that ACL works let
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Prompt Command Shortcut Description
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Whole Enchilada/Crazy Insano Lab #2
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Registering for Your CCNA Exam Obje
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3. Configure the router to receive
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Point-to-Point Protocol (PPP) Objec
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MTU 1500 bytes, BW 128 Kbit, DLY 20
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So what have I learned here? In thi
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PAP (Password Authentication Protoc
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00:54:36: Se0/0 IPCP: O CONFREQ [Cl
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4. Let’s turn off debugging. Use
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20. 01:24:46: Se0/1 LCP: MagicNumbe
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“real-world” scenario. Undo all
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Remote Access DUN with PPP Encapsul
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lord(config)#ipx routing 0000.BBBB.
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Setting up a Router to be a Frame R
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Objective: To learn how to set up a
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turner#sh frame-relay pvc PVC Stati
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Step-By-Step Instructions: 1. Cable
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Fully-Meshed Frame Relay with 3 Rou
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Shadow 16 17 18 18 Diekman 17 16 Kn
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interface connections for #16 and #
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Frame Relay Operation and Troublesh
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network we will see all but our own
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7. Wrong ip address/mask Here I jus
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outer#sh frame map Serial0/0 (up):
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3. Configure the ISDN interface on
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Challenge Lab or Supplemental Activ
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3. Configure the ISDN interface on
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00:21:08: %LINEPROTO-5-UPDOWN: Line
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Data Link Layer Two things happen h
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00:13:27: %LINEPROTO-5-UPDOWN: Line
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In line 1 we see our Q931 requestin
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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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