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 to 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 18-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 16-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 16-1. "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section	Questions Covered in This Section
Building a Network Using Internal BGP	1
Understanding iBGP Network Requirements	24
Designing and Configuring a Scalable iBGP Network	57
Verifying the iBGP Configuration	89
Controlling BGP Traffic	1012
Connecting to the Internet with BGP	13
Determining the BGP Path by Tuning the Attributes	1416
Redistribution Between IGP and BGP	1718

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:	How does the router determine whether it has received an iBGP or an eBGP update? The router is configured to iBGP or eBGP; it cannot determine between the two. The iBGP updates are not propagated; a received update must be from eBGP. The router sees whether the received update has routes in the IGP routing table. The router checks the autonomous system number in the open message that was sent.
2:	Which of the following is true of iBGP neighbors? iBGP does not require neighbors to be physically adjacent. iBGP requires the neighbors to be physically adjacent. iBGP neighbors must share the same IP subnet address. iBGP neighbors must be used on a broadcast medium.
3:	When is it possible to turn off the default synchronization? When confederations are used When route reflectors are configured When the iBGP neighbors are fully meshed When all the routers in the autonomous system are running iBGP
4:	Why is it necessary to have a fully meshed iBGP network? No updates are propagated by other clients . It is not possible to redistribute between the IGP and BGP. To prevent routing loops . BGP treats routing within the autonomous system as if it were an NBMA network.
5:	Which of the following is true of route reflectors? Route reflectors disallow the forwarding of attributes. Route reflectors prevent the need for a fully meshed eBGP network. Route reflectors are used to reflect routes to all neighbors. Route reflectors forward routing updates to neighbors or within the autonomous system.
6:	Which of the following is true of a route reflector client? A client is a router that sends updates to the route reflector to be forwarded to other clients. A client is a router that receives updates from a route reflector. A client is a router that is configured and acts as a stub router. A client is a router that receives routes from an IGP.
7:	Select the statement that is true. The routing table for IP contains the selected BGP path and the attributes. BGP uses the command clear ip bgp * to clear the IP routing table. By default, BGP does not store prefixes before policy application. BGP sends incremental updates every 15 minutes.
8:	Which of the following fields are shown in the show ip bgp neighbors command? Neighbors The prefixes associated with each neighbor State of the BGP connections The last time a message was read from a neighbor
9:	What command is used to display the route reflector clients? show ip ibgp neighbors show ip bgp neighbor show ip bgp route show ip route reflector
10:	Which of the following filtering techniques can be used to filter on prefixes? AS_Path lists Distribute lists Access lists Prefix lists
11:	When using a prefix list, what is the match criterion used? The first match The attribute name The match between ge and le All matches
12:	Which command is used to configure a prefix list? ip bgp prefix list ip prefix-list access-list (200-299) bgp prefix list (200-299)
13:	What are the most common forms of multihoming? ISPs send default routes into the autonomous system. Complete routing tables are sent into the IGP. Default and some selected routes are sent by the ISP into the autonomous system. All routes known by ISP are sent into the autonomous system.
14:	In the command show ip bgp , the origin field is placed at the end of each line in the table. It can be which of the following values? Entry originated from IGP and was advertised with a network router configuration command. Entry originated from an EGP. Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP. The IP address of the originating router.
15:	Which command shows the local preference and weight attribute values? show bgp attributes show ip bgp show ip bgp path show ip bgp attributes
16:	Give the command that would change the weight attribute for the path to the next hop 192.10.5.3. set weight 192.10.5.3 48 neighbor 192.10.5.3 weight 48 set attribute weight 48 ip bgp neighbor 192.10.0.0 remote-as 300 weight 48
17:	Which are the ways to advertise routes into BGP? They are automatically redistributed The network command Redistribute static routes Redistribute dynamically learned routes from the IGP
18:	What is the concern when advertising routes from BGP into an IGP? BGP will receive too many routes and increase the size of the Internet routing tables. Private addresses will be propagated into the Internet. Routing loops will occur. The IGP will be overwhelmed.

The answers to the "Do I Know This Already?" 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 :

• 9 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.

• 1014 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."

• 15 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.