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Concentrate on the tables in this chapter, which summarize the information relating to all the...

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05.35700737 CH04 Page 122 Wednesday, February 17, 1999 3:15 PM



122



Chapter 4: Understanding LANs and LAN Switching



How to Best Use This Chapter

By taking the following steps, you can make better use of your study time:









Take the “Do I Know This Already?” quiz and write down your answers. Studies show

retention is significantly increased through writing facts and concepts down, even if you

never look at the information again!







Figure 4-1 helps guide you to the next step in preparation for this topic area on the CCNA

exam.



How to Use This Chapter

Do I know this already? Quiz



Application

Presentation



Medium score



Session

Transport



Data Link



Review Chapter

using charts and

Network

tables

Data Link



Physical



Physical



Read Chapter

Network



High score

Host B

Application

High

scorePresentation

want Session

more

review Transport

Skip

NetworkChapter

Data Link

NA2603q3



Low score

Host A



Physical



Router 1

End-of-chapter

exercises



Next Chapter



NA260401



Figure 4-1



Keep your notes and answers for all your work with this book in one place for easy

reference.



05.35700737 CH04 Page 123 Wednesday, February 17, 1999 3:15 PM



“Do I Know This Already?” Quiz



123



“Do I Know This Already?” Quiz

1. Name two benefits of LAN segmentation using transparent bridges.



_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

2. What settings are examined by a bridge or switch to determine which bridge or switch



should be elected as root of the spanning tree?

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

3. Assume a building has 100 devices that are attached to the same Ethernet. These devices



are migrated to two different shared Ethernet segments, each with 50 devices. The two

segments are connected to a Cisco LAN switch to allow communication between the two

sets of users. List two benefits that would be derived for a typical user.

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

4. Name the two methods of internal switching on typical switches today. Which provides



less latency for an individual frame?

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

5. Describe how a transparent bridge decides whether it should forward a frame and how it



chooses the interface out of which to forward the frame.

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

6. Describe the benefits of the Spanning-Tree Protocol as used by transparent bridges and



switches.

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________



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124



Chapter 4: Understanding LANs and LAN Switching



7. Does a bridge/switch examine just the incoming frame’s source MAC address, destination



MAC address, or both? Why?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

8. When a bridge or switch using the Spanning-Tree Protocol first initializes, who does it



claim should be the root of the tree?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

9. Define the difference between broadcast and multicast MAC addresses.



______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

10. Define the term broadcast domain.



______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

11. Explain the function of the loopback and collision detection features of an Ethernet NIC



in relation to half-duplex and full-duplex operation.

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________

12. Name the three interface states that the Spanning-Tree Protocol uses, other than



forwarding. Which of these states is transitory?

______________________________________________________________________

______________________________________________________________________

______________________________________________________________________



05.35700737 CH04 Page 125 Wednesday, February 17, 1999 3:15 PM



“Do I Know This Already?” Quiz



125



You can find the answers to the “Do I Know This Already?” quiz in Appendix B on page 555.

Review the answers, grade your quiz, and choose an appropriate next step in this chapter based

on the suggestions in the “How to Best Use this Chapter” topic earlier in this chapter. Your

choices for the next step are as follows:









5 or fewer correct—Read this chapter.







9 or more correct—If you want more review on these topics, skip to the exercises at the

end of this chapter. If you do not want more review on these topics, skip this chapter.



6, 7, or 8 correct—Review this chapter, looking at the charts and diagrams that

summarize most of the concepts and facts in this chapter.



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