Do I Know This Already? Quiz

   

"Do I Know This Already?" Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide what parts of this chapter to use. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now.

The 12-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you to determine how to spend your limited study time.

Table 6-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 6-1. "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section	Questions Covered in This Section
Understanding OSPF Fundamentals	13
OSPF Features	46
OSPF Operation in a Single Area	79
OSPF Network Topologies	1012

NOTE

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 this question wrong for purposes of the self-assessment. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might provide you with a false sense of security.

1:	What is a neighbor in OSPF? A neighbor is a router in the same area. A neighbor is a router in the same classful network. A neighbor is a router on a multiaccess link, with an adjacency with a DR. A neighbor is another router with the same network address.
2:	What is an adjacency in OSPF? An adjacency is when another router has received an LSA from another area. The areas are adjacent. An adjacency is the state that two neighbors can achieve after they have synchronized their OSPF databases. An adjacent router is one that is sent a hello packet. Routers connected across a WAN but not directly connected, for example Frame Relay, are considered adjacent to each other.
3:	What is a designated router? The router responsible for maintaining the SPF tree for a totally stubby area The router responsible for summarizing routes to another areas A router responsible for making adjacencies with all routers on a multiaccess link and maintaining those adjacencies The router responsible for forwarding all the traffic across the global Internet
4:	How often, by default, does OSPF send out hello packets on a broadcast multiaccess link? By default, OSPF sends out hello packets every 30 seconds on a broadcast network. By default, OSPF sends out hello packets every 40 seconds on a broadcast network. By default, OSPF sends out hello packets every 3.3 seconds on a broadcast network. By default, OSPF sends out hello packets every 10 seconds on a broadcast network.
5:	If a router has an OSPF priority set to 0, what does this indicate ? A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority. A router with the OSPF priority set to 0 is one that will switch OSPF packets before it does anything else. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a designated nor a BDR. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR.
6:	When a router sends an LSA on a multiaccess link, to what is it sent? Designated router Designated router and the BDR To all routers on the link; all routers maintain adjacencies, but it is only the DR that updates the rest of the network DR who updates the BDR every 3.3 minutes
7:	What does it mean when an interface shows that it is in the init state? That an interface is coming online, determining the IP address and OSPF parameters That a router coming online is waiting for a hello from a neighbor That this is an point-to-multipoint interface and is waiting to connect to the WAN cloud Seen only on broadcast links, it shows that the election of the DR is in progress
8:	If the network is stable and sees no changes, how often will it send LSAs? Why are these updates sent out periodically? Every 30 minutes by default. This is to ensure the integrity of the topological databases. Every 30 seconds by default. This is to ensure that the network is fully connected. Never, there is no need if the network is stable. Whenever an LSA is received, this means there is a problem on the network that needs to be flooded through the network.
9:	In learning a new route, what will OSPF do if a received LSA is not found in the topological database? The LSA is flooded immediately out of all the OSPF interfaces, except the interface from which the LSA was received. The LSA is dropped and a message is sent to the transmitting router. The LSA is placed in the topological database and an acknowledgement is sent to the transmitting router. The sequence numbers are checked, and if the LSA is valid, it is entered into the topology database.
10:	What does NBMA stand for? Nonbroadcast multiadjacencies. Nonbroadcast multiaccess. Nonbreachable multidigest. Nonbackup multiarea .
11:	Which of the following best describes a virtual link? A dial-on-demand link that appears to the routing tables of OSPF as if it is always present, but is raised when needed A connection to another autonomous system that simulates one autonomous system A virtual connection to a remote area that does not have any connections to the backbone (Area 0) Point-to-point and point-to-multipoint link across an NBMA cloud
12:	RFC 2328 describes the operation of OSPF in two modes across an NBMA cloud. What are they? Point-to-point and broadcast operation Nonbroadcast multiaccess and broadcast operation Point-to-point and point-to-multipoint operation Nonbroadcast multiaccess and point-to-multipoint operation

The answers to this quiz are found in Appendix A, "Answers to Chapter 'Do I Know This Already?' Quizzes and Q&A Sections." The suggested choices for your next step are as follows :

• 6 or less overall score Read the entire chapter. This includes the "Foundation Topics" and "Foundation Summary" sections, the "Q&A" section, and the "Scenarios" at the end of the chapter.

• 79 overall score Begin with the "Foundation Summary" section, and then go to the "Q&A" section and the "Scenarios" at the end of the chapter. If you have trouble with these exercises, read the appropriate sections in "Foundation Topics."

• 10 or more overall score If you want more review on these topics, skip to the "Foundation Summary" section, and then go to the "Q&A" section and the "Scenarios" at the end of the chapter. Otherwise, move to the next chapter.