Appendix A. Answers to Chapter ‘Do I Know This Already?’ Quizzes and Q&A Sections

Chapter 1

“Do I Know This Already?”



For each layer of the OSI model, match the forwarding criteria used by a switch:

C Layer 1

A. IP address

D Layer 2

B. UDP/TCP port

A Layer 3

C. None

B Layer 4

D. MAC address


What is multilayer switching (MLS)?

Answer: MLS forwards traffic using information from Layer 2, Layer 3, and Layer 4—all in hardware at wire speed.


Fill in the blanks in the following statement:

In the 20/80 rule of networking, 20% of the traffic on a segment usually stays ______, whereas 80% travels________________.

Answer: Local, travels across the network


What is a collision domain, and where does it exist in a switched ...

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