CCNP Self-Study: CCNP BCMSN Official Exam Certification Guide, Fourth Edition

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

Chapter 1

“Do I Know This Already?”

1.	c
2.	e
3.	d
4.	d
5.	a
6.	c
7.	b
8.	c
9.	c
10.	c
11.	d
12.	c

Q&A

1.	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
2.	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.
3.	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
4.	What is a collision domain, and where does it exist in a switched ...