QA

Q&A

The questions and scenarios in this book are more difficult than what you should experience on the actual exam. The questions do not attempt to cover more breadth or depth than the exam; however, they are designed to make sure that you know the answer. Rather than allowing you to derive the answers from clues hidden inside the questions themselves, the questions challenge your understanding and recall of the subject. Hopefully, these questions will help limit the number of exam questions on which you narrow your choices to two options and then guess.

You can find the answers to these questions in Appendix A.

1.

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

___ Layer 1	A. IP address
___ Layer 2	B. UDP/TCP port
___ Layer 3	C. None
___ Layer 4	D. MAC address

2.

What is multilayer switching (MLS)?

3.

Fill in the blanks in the following statement:

In the 20/80 rule of networking, 20 percent of the traffic on a segment usually stays ______, while 80 percent travels ________________.

4.

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

5.

What is a broadcast domain, and where does it exist in a switched LAN?

6.

What is a VLAN, and why is it used?

7.

At what OSI layers do devices in the distribution layer usually operate?

8.

What is network segmentation? When is it necessary, and how is it done in a campus network design?

9.

Is it possible to use Layer 2 switches in the distribution layer rather than Layer 3 switches? If so, what are the limitations?