Take the quiz (either here or use the PTP software) if you want to use the score to help you decide how much time to spend on this chapter. Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes,” found at the end of the book, includes both the answers and explanations. You can also find answers in the PTP testing software.
Table 12-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping Caution
The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark that question as wrong for purposes of the self-assessment.
Giving yourself credit for an answer you incorrectly guess skews your self-assessment results and might provide you with a false sense of security.
a. To measure the delay across a link
b. To find the location of a cable failure
c. The measure the jitter across a link
d. To find the location of a buried cable
a. An owner’s grant to some outside party to use a piece of land
b. A provider’s right to bury cables under the ocean
c. When cars get out of the way of a train
d. The right to dig up a cable that’s already been buried
3. What are two common ways to run cables over long distances? (Choose two.)
a. Send data through a satellite link
b. Bury the cables in trenches
c. Attach the cables to poles
d. Carry them in large, specially designed ships
4. What are four common last-mile network technologies?
a. FWA, GPON, DOCSIS, metro fiber
b. Wi-Fi, GPON, Ethernet, DOCSIS
c. FWA, Ethernet, DOCSIS, Optical SC
d. FWA, Optical SC, DOCSIS, metro fiber
5. Why is the last mile often the hardest to provide?
a. Because physically running cable through the last mile is more difficult than other places
b. Because the cost of building the infrastructure must be paid for by a small set of users
c. Because providers cannot use wireless connectivity for the last mile
d. Because providers cannot use Ethernet for the last mile
6. What is a point of presence?
a. A provider’s local office space for sales and maintenance
b. A local government office where rights-of-way can be purchased
c. A local provider facility where circuits are terminated
d. The customer’s property
7. Why would a provider agree to settlement-free peering?
a. To offer service to a charitable organization
b. Bidirectional traffic between the providers will be roughly equal
c. To offer service to another provider
d. To offer service at an Internet exchange point (IXP)
8. What are the primary advantages of a ring topology? (Choosetwo.)
a. You can build a large network using only two ports per router.
b. Ring topologies converge more quickly than hub-and-spoke topologies.
c. Rings are two-connected.
d. Rings can continue forwarding traffic even with two link or node failures.