Qa

The questions and scenarios in this book are designed to be challenging and 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, mastering these questions will help you 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. For more practice with exam-like question formats, use the exam engine on the CD-ROM.

1. In ATM interface configurations, what is the first usable VCI available for user-defined virtual circuits?

2. What is the purpose of the dsl operating-mode auto command?

3. What purpose does the LLC header serve in the LLC encapsulated technique for PPPoA?

4. Consider a situation in which you want each routed protocol to use a different virtual circuit for transport across the network. Which encapsulation would allow this, and what might be accomplished by such a configuration?

5. In the following example, what is the IP address assigned to the provider-facing interface?

interface Ethernet0/0 ip address 172.16.0.1 255.255.0.0 ip nat inside

interface ATM0/0 no ip address dsl operating-mode auto

interface ATM0/0.1 multipoint class-int ppp-default pvc 8/35

interface virtual-template1 encapsulation ppp ip address negotiated ip nat outside

vc-class atm ppp-default encapsulation aal5snap protocol ppp virtual-template1 ubr 256

6. List one alternative to the use of a static default route.

7. Is there a time when a router using a dynamic routing protocol might also benefit from a static default route? If so, when?

8. If a source address does not match a defined access list for a NAT definition, what is the result?

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