Appendix D. Answers to Review Questions
Answers to Chapter 1 Review Questions
1 What is the current version of EGP?
Answer: The current version of EGP is 2.
2 What is an EGP interior neighbor? An EGP exterior neighbor?
Answer: An EGP gateway’s neighbor is interior if it is within the same AS. An exterior neighbor is in a different AS.
3 What is the primary difference between an EGP stub gateway and an EGP core gateway?
Answer: Stub gateways can advertise only networks that are interior to their own AS. Core gateways can advertise both interior and exterior networks.
4 Why does EGP use the concept of a core, or backbone, AS?
Answer: EGP has no mechanisms for detecting loops. Therefore, a loop-free topology must be engineered physically so that ...