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

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8. Now let’s try the show access lists again: gates#sh access-list Extended IP access list 138 deny icmp host 192.168.1.2 192.168.3.0 0.0.0.255 (14 matches) permit icmp any any (4 matches) gates# Aha! With extended ACL’s we can see the number of matches (or attempts) to get through our little router “mini-firewall.” We can even see from who it comes and how many times an attempt was made. Hmmm…almost like a protocol inspector. The debug ip packet details will show similar results. 9. Let’s add another ACL to stop 192.168.3.2 from telnetting to 172.16.1.1. But first let’s try to telnet to be certain it works. If it works you should see: 10. Now let’s create the extended ACL: gates(config)#access-list 150 deny tcp host 192.168.3.2 any eq 23 gates(config)#access-list 150 permit tcp any any 11. And apply it to the interface: gates(config)#int e0/1 gates(config-if)#ip access-group 150 in 12. Now telnet should work on 192.168.3.3 but not on 192.168.3.2. You will see this type of message if telnet is not working: 349
Supplemental Lab or Challenge Activity: 1. Design a network using 3 or more routers using a different routing protocol than RIPv2. Vary the IP address classes. Deny telnet access to everyone. 2. Go out to <strong>CISCO</strong> and find out other port numbers for extended ACL’s. 3. Try using a protocol inspector to capture packets. So What Have I Learned Here? In this lab you learned how to implement a standard ACL in a simple network. You also learned about the basic show and debug commands for use with ACL’s. Finally you got a refresher in basic networking with Microsoft. In the next lab you will work with extended ACL’s. Guest Router Name Gates…if you haven’t guessed it <strong>by</strong> now…Bill Gates is one of the founders of Microsoft—the world’s largest computer software empire. Microsoft is one of the most hated targets of hackers because of the closed source code. On the other hand they say Apple’s are almost un-hackable…mainly because hackers do not use Apples, do not care about Apples, and never really will as long as Microsoft is around. TNT had a good biography on Bill Gates with Anthony M. Hall as Bill Gates. See it if you get the chance. 350
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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
Page 306 and 307: Redistribution of IGRP and RIP Obje
Page 308 and 309: 3. Now we can see how this affects
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Page 312 and 313: Gateway of last resort is not set I
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Page 316 and 317: 7. Notice the reachable/not reachab
Page 318 and 319: Supplemental Lab or Challenge Activ
Page 320 and 321: (VLSM/CIDR). OSPF on a wider scale
Page 322 and 323: wash# leung#sh ip ospf Routing Proc
Page 324 and 325: Border Gateway Protocol (BGP) Objec
Page 326 and 327: 3. Let’s add in the BGP. It too u
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Page 334 and 335: gibson#ping ipx 0000.1234.1111 % Un
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 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 384 and 385: PAP (Password Authentication Protoc
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
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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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