Exam Prep Questions

Question 1	Which one of the following statements is false concerning route reflectors? A. Route reflectors change the BGP split horizon rule by letting the route reflector propagate routes learned by IBGP to other IBGP peers. B. A route reflector cluster is the grouping of the route reflector and its clients . C. Route reflectors do not have to be in a full mesh configuration with IBGP. D. When a route reflector gets an update from a client, it sends it to all non-client peers except the route originator.
A1:	Answer C is correct. The route reflectors must be fully meshed with IBGP to ensure that all routes learned will be sent throughout the AS. Answers A, B, and D are all accurate statements concerning route reflectors.
Question 2	Which one of the following terms describes a unit containing a route reflector and the configured route reflector clients? A. Area B. Connection C. Cluster D. Confederation
A2:	Answer C is correct. This combination of a route reflector and its client peers is called a cluster. Answer A is incorrect because an area is a logical grouping of network segments and their connected devices. Answer B is incorrect because a connection is merely a link between two network devices. Answer D is incorrect because a confederation is a BGP configuration in which a single AS is divided into multiple logical ASs that run Exterior BGP (EBGP) between them.
Question 3	Which of the following commands generates the following table output? BGP table version is 583644, local router ID is 172.16.157.32 Status codes: s suppressed, d damped, h history, * valid, > best, i internal Origin codes: I IGP, e EGP, ? incomplete Network Next Hop Metric LocPref Weight Path A. show ip bgp B. show ip prefix-list C. show ip protocols D. debug ip bgp neighbors
A3:	Answer A is correct. In this BGP routing table generated by show ip bgp , the first column displays the status of each stored route based on the codes in the legend above the table. Even though BGP can store several routes to the same destination, a BGP router has only one best, or preferred, route. The optimal path for each route is specified by a > symbol in the first status column. Answer B is incorrect because the show ip prefix-list command displays all information on all prefix lists. Answer C is incorrect because show ip protocols displays all IP protocol information on the Cisco router. Answer D is incorrect because debug ip bgp neighbors outputs the detailed BGP neighbor status.
Question 4	You have 20 peers in your IBGP network. How many TCP peer sessions do you need if you do not implement route reflectors? A. 380 B. 190 C. 100 D. 20
A4:	Answer B is correct. The answer is derived from the formula n(n “1) ·2, where n is the number of IBGP peer routers; therefore, the answer is 190. Answers A, C, and D are incorrect because the calculations are wrong.
Question 5	Which one of the following sets of commands is the proper syntax to configure a route reflector client? A. RouterA(config)# neighbor 172.16.1.2 as-remote 65410 RouterA(config)# neighbor 172.16.1.2 route-reflector-client B. RouterA(config)# neighbor 172.16.1.2 remote-as 65410 RouterA(config)# neighbor 172.16.1.2 route-reflector-client C. RouterA(config-router)# neighbor 172.16.1.2 as-remote 65410 RouterA(config-router)# 172.16.1.2 route-reflector-client D. RouterA(config-router)# neighbor 172.16.1.2 remote-as 65410 RouterA(config-router)# neighbor 172.16.1.2 route-reflector-client
A5:	Answer D is correct. In router configuration mode, the neighbor remote-as syntax is used to create the peer relationship and the neighbor route-reflector-client command generates the peer relationship. Answer A is incorrect because it is not in router configuration mode and the command is not as-remote . Answer B is incorrect because although the syntax is perfect, the configuration mode is wrong. Answer C is incorrect because it is not as-remote and the neighbor command is missing from the second line.
Question 6	Which keyword needs to follow the show ip bgp command to display detailed information on TCP and BGP peer connections? A. peer- group B. summary C. neighbors D. community
A6:	Answer C is correct. The neighbors keyword shows detailed information on TCP and BGP neighbor connections. Answer A is incorrect because the peer-group keyword displays information on peer groups. Answer B is incorrect because the summary keyword shows a synopsis of BGP neighbor status. Answer D is incorrect because the community keyword displays routes matching the communities.
Question 7	Which of the following statements identifies a benefit of prefix lists over access lists? (Choose all that apply.) A. Prefix lists are not as processor- intensive as access lists because they are quicker loading and better at performing lookups of large lists. B. The rules of prefix lists are somewhat different from access lists, including the lack of an implicit deny statement at the end of the list. C. Prefix lists are more flexible than access lists because they enable you to add and delete individual lines and perform incremental changes. D. Prefix lists are generally more user -friendly than the typical access list.
A7:	Answers A, C, and D are correct and represent benefits of prefix lists over access lists. Answer B is incorrect because the functionality of prefix lists are similar to access lists yet enhanced. Prefix lists do indeed have an implicit deny statement at the end of the list.
Question 8	You would like to reset the hit count that is displayed for a particular prefix list whenever the show ip prefix-list detail command is run. Which one of the following commands would you run? A. ip clear prefix-list B. clear prefix-list C. clear ip prefix list D. clear ip prefix-list
A8:	Answer D is correct. The clear ip prefix-list command can be used to clear and reset the hit count that is displayed for a particular prefix list whenever the show ip prefix-list [detail summary] prefix-list- name is run. The full syntax is clear ip prefix-list prefix-list-name . Answer A is incorrect because the keyword ip comes after the clear command. Answer B is incorrect because the keyword ip is missing. Answer C is incorrect because the hyphen is missing between prefix and list .
Question 9	Which one of the following is not a common method for configuring multiple connections to the ISPs (multihoming)? A. All ISPs pass only a few selected routes to your AS. B. All ISPs pass only default routes to your AS. C. All ISPs pass default routes and selected routes to your AS. D. All ISPs pass all routes to your AS.
A9:	Answer A is correct. Building an environment where all the ISPs pass only a few selected routes to the AS is not a typically used multihoming method. There are basically three common ways to configure multiple connections to the ISPs. One method entails all ISPs passing only default routes to your AS. A second method is to have all ISPs pass default routes and selected routes to your AS (for example, certain high-traffic customers). Thirdly, all ISPs can pass all routes to your AS.
Question 10	Which of the following are primary methods that an AS uses to inject route information into BGP? (Choose all that apply.) A. Using the network command. B. Redistributing static routes to the null 0 interface. C. Redistributing dynamic routes into BGP. D. Using the aggregate-address router configuration command.
A10:	Answers A, B, and C are correct. An AS uses three primary methods to inject route information into BGP: using the network command, redistributing static routes to null 0, and redistributing dynamic routes into BGP. Answer D is incorrect because the aggregate-address router configuration command is the preferred method for advertising a summary route.