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 "Foundation Topics" portion of the chapter, helps you to determine how to spend your limited study time.

Table 8-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 8-1. "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section	Questions Covered in This Section
The Purpose of Using OSPF in a Multiple Area Network	13
The Features of Multiple Area OSPF	46
The Operation of OSPF Across Multiple Areas	79
Design Considerations in Multiple Area OSPF	1012

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 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:	When using OSPF, which of the following is a problem with large routing tables? The routing table is sent out every 30 seconds, which will cause congestion. As the routing table increases in size , the longer each lookup becomes. The memory requirements on the router also increase. The process will time out before a path to the destination is found. Fast switching cannot be used if the routing table exceeds a certain size.
2:	Why does the frequency of the SPF algorithm increase with the size of the area? Each router will have more neighbors, and synchronizing the databases takes priority. The topology databases will subdivide after a certain size, requiring multiple SPF calculations. As the area size increases, each recalculation will also take longer, which might result in errors, requiring the algorithm to rerun. The larger the network, the greater the probability of a network change and, thus, a recalculation of the entire area.
3:	Multiple areas are one of the main features of OSPF. Which of the following statements explain why this feature is such an important enhancement on earlier routing protocols? It is easier to implement security. All computation is kept within the area, with minimum communication between the areas, allowing the network to scale to larger sizes. The network domain, when divided into areas allows for the use of both IANA classful addressing and private addressing. The use of multiple areas allows for the use of prioritization.
4:	What is an internal router? An OSPF process running on a multilayer switch. When multiple OSPF processes are run on the same router, the internal router is responsible for managing the processes. A router responsible for maintaining a current and accurate database of every subnet within the area. All interfaces on this router are within the same area. A router running OSPF with no external links to another autonomous system.
5:	What is the purpose of an ABR? A router responsible for connecting to outside the autonomous system A router responsible for connecting two or more areas A logical group of nodes forming a backbone that connects other areas A group of routers running OSPF with no external links
6:	What do the initials ASBR represent? Authority Subnet Boundary Router Autonomous System Border Router Automatic Summarization Boundary Router Autonomous System Boundary Router
7:	How are routes that are generated within an area propagated throughout the area? Type 3 and 4 LSAs In the summary LSA sent out every 30 minutes In the Hello packet between neighbors Type 1 and 2 LSAs
8:	Which of the following conditions must be met before any LSAs can be flooded out of all the interfaces? The interface is in a state of exchange or full adjacency . The interface is not connected to a totally stubby area. The LSA was not received through the interface. The interface is connected to a totally stubby area.
9:	Which of the following OSPF characteristics affect how the routing table is created? Whether there are multiple areas in the domain Whether MD-5 security has been configured The type of area in which the router is located Whether there are communications outside the autonomous system
10:	Which is the best design for OSPF? Hierarchical with summarization Tiered Flat with summarization Elliptical
11:	Why does the type of area determine the number of routers that can be placed in the area? Each LSA packet type has a fixed header, limiting the number of paths that can be listed. The area type determines the number of LSAs and how often and how much CPU and memory each SPF computation requires. Stub areas are not summarized, requiring additional resources. The backbone area requires fewer resources because it simply sends summarized path information into other areas, which does not require the SPF algorithm to be run.
12:	Which of the following must be observed when creating a virtual link? Both routers must share a common area. Both routers must share the same subnet address. One of the routers must be connected to area 0. Both routers must share the same process ID.

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.