CCNA Cisco Certified Network Associate Study Guide - FTP Server

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86 Chapter 2 � Switching Technologies Some switches can be configured to perform cut-through switching on a per-port basis until a user-defined error threshold is reached. At that point, they automatically change over to store-and-forward mode so they will stop forwarding the errors. When the error rate on the port falls below the threshold, the port automatically changes back to cut-through mode. FragmentFree (Modified Cut-Through) Summary FragmentFree is a modified form of cut-through switching, in which the switch waits for the collision window (64 bytes) to pass before forwarding. If a packet has an error, it almost always occurs within the first 64 bytes. FragmentFree mode provides better error checking than the cut-through mode with practically no increase in latency. This is the default switching method for the 1900 switches. The information presented in this chapter was designed to give you the background in layer-2 switching that you need before continuing with the rest of this book. Specifically, we covered the following information: � Layer-2 switching and how switches differ from bridges � Address learning and how the MAC address filter table was built � Forward/filtering decisions that layer-2 switches make and how they make them � Loop avoidance and the problems caused when loop avoidance schemes are not used in the network � Spanning-Tree Protocol and how it prevents loops � LAN switch types used on <strong>Cisco</strong> routers and how they differ
Key Terms Summary 87 Before taking the exam, be sure you’re familiar with the following terms: address learning Bridge Protocol Data Units (BPDUs) cut-through frame switching designated port FragmentFree nondesignated port root bridge Spanning-Tree Protocol (STP) store-and-forward packet switching
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CCNA Cisco Certified Network Associ
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Associate Publisher: Neil Edde Cont
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This book is dedicated to all the C
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Introduction Welcome to the excitin
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Introduction xxv installing, managi
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Introduction xxvii but you still ha
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Introduction xxix To meet the CCNP
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Introduction xxxi through!) Also, b
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CCDPs must also demonstrate profici
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Introduction xxxv answering the rev
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Introduction xxxvii don’t need to
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Introduction xxxix questions and un
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Assessment Questions Assessment Que
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Assessment Questions xliii 9. Which
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Assessment Questions xlv 17. What i
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Assessment Questions xlvii 23. Whic
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Assessment Questions xlix 31. What
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Assessment Questions li 39. What ar
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Assessment Questions liii 47. Which
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Answers to the Assessment Questions
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Chapter 1 Internetworking THE CCNA
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Internetworking Models Internetwork
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The OSI Reference Model FIGURE 1.1
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FIGURE 1.3 Layer functions The OSI
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The OSI Reference Model 9 JPEG The
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The OSI Reference Model 11 Connecti
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The OSI Reference Model 13 answer t
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The OSI Reference Model 15 before s
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The OSI Reference Model 17 The rout
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The OSI Reference Model 19 For a ho
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Ethernet Networking 21 The Physical
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Ethernet Networking 23 Ethernet is
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FIGURE 1.11 802.3 and Ethernet fram
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802.2 and SNAP FIGURE 1.12 802.2 an
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Ethernet Networking 29 You can iden
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FIGURE 1.13 Data encapsulation Data
Page 77 and 78: The Cisco Three-Layer Hierarchical
Page 79 and 80: The Core Layer The Cisco Three-Laye
Page 81 and 82: Assembling and Cabling Cisco Device
Page 89 and 90: 6-3 7-2 8-1 Selecting Cisco Product
Page 91 and 92: FIGURE 1.20 Cisco hub products Cisc
Page 93 and 94: Cisco Switches Selecting Cisco Prod
Page 95 and 96: Summary Key Terms Summary 51 This c
Page 97 and 98: Written Labs In this section, you w
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Page 113 and 114: Chapter 2 Switching Technologies TH
Page 115 and 116: Layer-2 Switching 73 switches are f
Page 117 and 118: Layer-2 Switching 75 switch now has
Page 119 and 120: Loop Avoidance FIGURE 2.2 Broadcast
Page 121 and 122: Spanning-Tree Protocol (STP) Spanni
Page 123 and 124: Spanning-Tree Protocol (STP) 81 802
Page 125 and 126: Spanning-Tree Protocol (STP) 83 If
Page 127: FIGURE 2.6 Different switching mode
Page 131 and 132: Review Questions 1. Which LAN switc
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Page 135 and 136: 15. What is the default LAN switch
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138 Chapter 3 � Internet Protocol
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Answers to the Written Lab 167 8. S
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Answers to Review Questions 169 12.
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In this chapter, you will be introd
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174 Chapter 4 � Configuration and
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Routing This chapter will discuss t
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238 Chapter 5 � IP Routing In our
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240 Chapter 5 � IP Routing router
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242 Chapter 5 � IP Routing Figure
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244 Chapter 5 � IP Routing 2501A(
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246 Chapter 5 � IP Routing 2501C(
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248 Chapter 5 � IP Routing 2621A
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252 Chapter 5 � IP Routing 2501C(
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254 Chapter 5 � IP Routing To con
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256 Chapter 5 � IP Routing exampl
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258 Chapter 5 � IP Routing Howeve
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260 Chapter 5 � IP Routing Routin
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262 Chapter 5 � IP Routing When a
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266 Chapter 5 � IP Routing It is
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268 Chapter 5 � IP Routing RIP ha
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270 Chapter 5 � IP Routing varian
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272 Chapter 5 � IP Routing 2501B
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274 Chapter 5 � IP Routing The fo
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276 Chapter 5 � IP Routing The Sh
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278 Chapter 5 � IP Routing The De
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280 Chapter 5 � IP Routing 07:13:
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282 Chapter 5 � IP Routing Comman
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284 Chapter 5 � IP Routing Writte
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286 Chapter 5 � IP Routing 2621(c
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288 Chapter 5 � IP Routing 2. Aft
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290 Chapter 5 � IP Routing weight
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292 Chapter 5 � IP Routing 5. Wha
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294 Chapter 5 � IP Routing 13. Wh
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296 Chapter 5 � IP Routing Answer
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298 Chapter 5 � IP Routing 13. C.
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Virtual LANs A Virtual Local Area N
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302 Chapter 6 � Virtual LANs (VLA
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Answers to Review Questions Answers
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Chapter 7 Managing a Cisco Internet
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The Internal Components of a Cisco
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Managing Configuration Registers 32
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Backing Up and Restoring the Cisco
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Using Cisco Discovery Protocol 345
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Using Telnet Using Telnet 351 Encap
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Using Telnet 353 Remember that the
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Checking Telnet Connections Using T
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Resolving Hostnames 357 This output
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Resolving Hostnames 359 To verify t
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Resolving Hostnames 361 it doesn’
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apollo Apollo echo appletalk Applet
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Key Terms Summary 365 Next, you lea
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Command Description Summary 367 no
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Written Lab Write in the answers to
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Hands-on Labs 371 flash tftp. This
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Lab 7.5: Using Telnet Hands-on Labs
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Hands-on Labs 375 4. Test your host
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Review Questions 377 5. Which memor
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13. What does the command cdp timer
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382 Chapter 7 � Managing a Cisco
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384 Chapter 7 � Managing a Cisco
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Most network administrators have, a
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388 Chapter 8 � Configuring Novel
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Answer to Review Questions Answer t
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Chapter 9 Managing Traffic with Acc
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Access Lists 441 interface. Applyin
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Access Lists 443 IP extended acces
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Access Lists 445 Now, that was the
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Access Lists 447 On the Acme router
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Access Lists 449 Once you choose th
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discard Discard (9) domain Domain N
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IPX Access Lists 453 LAN. However,
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IPX Access Lists 455 The access lis
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Router(config)#access-list 1010 per
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Key Terms Summary 459 � How to co
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Written Lab In this section, write
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Hands-on Labs 463 3. Choose an acce
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Hands-on Labs 465 5. Add the source
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Hands-on Labs 467 3. Configure an a
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Review Questions 469 4. Which of th
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Review Questions 471 10. Which of t
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Review Questions 473 18. Which acce
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Answers to Review Questions Answers
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Chapter 10 Wide Area Networking Pro
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Wide Area Networks 479 Demarcation
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High-Level Data-Link Control Protoc
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Point-to-Point Protocol (PPP) Point
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Point-to-Point Protocol (PPP) 485 A
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Point-to-Point Protocol (PPP) 487 I
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Frame Relay 489 Frame Relay provide
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Frame Relay 491 7. The CO receives
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Local Management Interface (LMI) Fr
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Frame Relay 495 out the same interf
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appletalk protocol eigrp no appleta
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Here’s an example using the Frame
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Frame Relay 501 really might need.
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Frame Relay 503 To see information
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Integrated Services Digital Network
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FIGURE 10.7 ISDN BRI reference poin
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Integrated Services Digital Network
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Dial-on-Demand Routing (DDR) 511 Th
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Dial-on-Demand Routing (DDR) 513 Th
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Optional Commands Dial-on-Demand Ro
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Summary Sho ip route Shows all rout
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Commands in This Chapter Command De
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Command Description Summary 521 sho
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Written Lab 523 13. Write the comma
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Hands-on Labs 525 3. To change the
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Hands-on Labs 527 In my seminars I
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FIGURE 10.10 ISDN lab E0 172.16.30.
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8. Configure the dialer information
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Review Questions 533 5. Regarding F
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13. Which command will list all con
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(The answers to the questions begin
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11. Config t Int bri0 Dialer string
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Answers to Review Questions 541 14.
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544 Appendix A � Practice Exam Qu
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546 Appendix A � Practice Exam 8.
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548 Appendix A � Practice Exam 18
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560 Appendix A � Practice Exam An
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The CCNA courseware for the new CCN
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570 Appendix B � Configuring the
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634 Appendix C � Commands in This
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650 Glossary A&B bit signaling Used
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652 Glossary address learning Used
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654 Glossary anycast An ATM address
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656 Glossary ATM Asynchronous Trans
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658 Glossary auxiliary port The con
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660 Glossary bridge A device for co
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662 Glossary CBR Constant Bit Rate:
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664 Glossary circuit switching Used
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666 Glossary configuration register
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668 Glossary crankback In ATM, a co
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670 Glossary DDP Datagram Delivery
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672 Glossary DSR Data Set Ready: Wh
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674 Glossary ELAN Emulated LAN: An
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676 Glossary failure domain The reg
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678 Glossary FragmentFree LAN switc
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680 Glossary helper address The uni
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682 Glossary IGP Interior Gateway P
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684 Glossary IP multicast A techniq
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686 Glossary learning bridge A brid
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688 Glossary MAC Media Access Contr
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690 Glossary MLP Multilink PPP: A t
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692 Glossary NetBEUI NetBIOS Extend
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694 Glossary NT1 network terminatio
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696 Glossary packet switch A physic
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698 Glossary poison reverse updates
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700 Glossary PVP tunneling permanen
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702 Glossary route poisoning Used b
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704 Glossary server Hardware and so
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706 Glossary span A full-duplex dig
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708 Glossary SR/TLB source-route tr
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710 Glossary subinterface One of ma
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712 Glossary TE terminal equipment:
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714 Glossary TRIP Token Ring Interf
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716 Glossary WAN wide area network:
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