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QUESTION 71 You are a trainee technician at Cisco Highway. Your instructor shows you the following router configuration: router bgp 65000 neighbor 172.16.1.1 remote-as 65000 neighbor 10.1.1.2 remote-as 64550 network 192.168.1.192 mask 255.255.255.224 Your instructor wants to know which of the following statements is true if interfaces 192.168.1.193 172.16.1.1 and 10.1.1.2 are active. What would your reply be? (Choose all that apply.)
A. Router A is in autonomous system 64550
B. Router A advertises network 192.168.1.192/27
C. Router A forms an iBGP relationship with neighbor 10.1.1.2
D. Router A forms and eBGP relationship with neighbor 172.16.1.1 Answer: B Explanation:
Router A is in AS 65000 as indicated on line 1. Line 2 specifies 172.16.1.1 as a neighbor and belonging to the same AS (iBGP peer). Line 3 specifies 10.1.1.2 as a neighbor and belonging to a different AS (eBGP peer). Line 4 specifies that 192.168.1.192/27 be advertised Chapter: 2
QUESTION 72 In which instance is it appropriate to use BGP?
A. If there is single connection to the Internet
B. If you have limited understanding of route filtering
C. If there is a low-bandwidth connection between autonomous systems
D. If route selection to routes outside of your autonomous system is not a concern
E. If an autonomous system allows packets to transit through it to reach other autonomous systems Answer: E Explanation: This is the only reason listed that would require you to run BGP. If you are serving as a transit AS for other downstream AS's, then you must run BGP so that all paths are known into the downstream AS's. Chapter: 2
QUESTION 73 You are a trainee technician at Cisco Highway. Your instructor shows you the following router configuration on Router CK1: router bgp 65000 network 10.0.0.0 neighbor 172.17.1.1 remote-as 65000 Your instructor wants to know what type of relationship is neighbor 172.17.1.1 to Router CK1. What would your reply be? (Choose all that apply.)
A. a peer router running iBGP
B. a peer router running eBGP
C. a community member running iBGP
D. a peer group member running iBGP
E. a peer group member running eBGP Answer: A Explanation: Line 1 specifies that Router A belongs to AS 65000 and the neighbor statement on line 3 indicates that the neighbor is also a member of AS 65000. Therefore, these routers are considered to be iBGP peers. Chapter: 2
QUESTION 74 Which two statements are true about BGP peering? (Choose two.)
A. Periodic keepalives are used to verify connectivity
B. Incremental keepalives are used to verify connectivity
C. It provides a "best effort" connection between two BGP providers
D. It provides a reliable connection between two BGP providers Answer: A, D Explanation: BGP uses periodic keepalives to maintain connectivity. The interval can be changed to suit your needs (fast failover). Each neighbor sessions runs over TCP (port 179) and ensures reliable delivery of routing information. Chapter: 2
QUESTION 75 You are a trainee technician at Cisco Highway. Your instructor shows you the following router configuration: interface serial 0 ip address 172.16.1.1 255.255.255.0 ! interface ethernet 0 ip address 10.1.1.1 255.255.255.0 ! router rip network 10.0.0.0 ! ip route 0.0.0.0 0.0.0.0 serial0 ! Your instructor wants to know which of the following statements is true. What would your reply be?
A. RIP updates are sent and received on interface serial 0 of the router
B. A default route is sent to neighbors on interface serial 0 of the router
C. A default route is sent to neighbors on interface ethernet 0 of the router
D. RIP updates are sent and received on interfaces serial 0 and ethernet 0 of the router Answer: D Explanation: RIP is a true classful routing protocol. One of the problems with classful routing protocols is that periodic routing updates are sent out all active interfaces on every router. Even if the router is not running RIP, it will still receive broadcast RIP packets. RIPv2 is a classless routing protocol and instead of using broadcast updates it sends multicast packets to a multicast address of 224.0.0.9. Chapter: 2
QUESTION 76 When using BGP policy-based routing, which two statements are true? (Choose two.)
A. Policy routing cannot be used to modify the AS-path
B. Policy routing can be used to alter the final destination of the IP packet
C. Policy routing allows traffic to be directed based on the source address
D. Policy routing can influence which router will be used as the next-hop router for a given packet Answer: C, D Explanation: Answers A and B are false. With the use of route maps, BGP AS paths may be lengthened by adding fictitious AS numbers. This technique is called AS path pre-pending. The final destination of a packet cannot be altered by a routing protocol or a routing protocol policy. Chapter: 2 QUESTION 77 When should BGP synchronization be unnecessary?
A. when only the edge routers in the AS will be running BGP
B. when traffic from a different AS passes through an AS to a third AS
C. when traffic from a different AS will not pass through an AS to a third AS
D. when sending and receiving of external BGP updates is controlled by using a number of different filtering methods Answer: C Explanation: All of the other items require BGP synchronization. When traffic from a different AS passes through an AS to a third AS, BGP will not advertise the route until all routers within the AS have learned of the of the route through IGP. Chapter: 2
QUESTION 78 Identify two statements regarding BGP peer groups from the choices below? (Choose all that apply.)
A. The peer group name is passed to other routers in the peer group during routing updates.
B. A peer group is a group of BGP neighbors with different update policies.
C. The peer group name is only local to the router on which it is configured.
D. A peer group allows options that affect outbound updates to be overridden.
E. BGP configurations can be placed on one peer group router and the configuration is applied to all members of the peer group. Answer: C, E Explanation: A BGP peer group is a group of routers that share similar configurations. Every configuration line supplied to a peer group definition is applied to each peer group member. A peer group name may be specified, but it is not passed to any other router; the name is local only to the router it is configured on. Chapter: 2
QUESTION 79 With regard to BGP attributes, which of the following statements are true? (Choose all that apply.)
A. Med is an optional attribute
B. Origin is an optional attribute
C. Next-hop is an optional attribute
D. Local Preference is an optional attribute
E. AS-Path is a well-known mandatory attribute
F. Community is a well-known mandatory attribute Answer: A, D, E Explanation: MED is an optional attribute ORIGIN is a well-known mandatory attribute NEXT_HOP is a well-known mandatory attribute LOCAL_PREF is a well-known discretionary attribute AS_PATH is a well-known mandatory attribute COMMUNITY is an optional attribute Chapter: 2
QUESTION 80 With regard to the network command on a BGP router, which of the following statements is true?
A. The local route matching the network command can be learned dynamically
B. The local route matching the network command are blocked from the BGP routing table
C. The route to a neighbor autonomous system must have the correct MED applied to be installed into BGPs routing table
D. The specified network is identified as a transit AS and traffic must pass through this AS to reach its final destination. Answer: A Explanation: The network command only specifies which networks are to be advertised by BGP. This can be learned from static routes, other routing protocols, or directly connected interfaces. Chapter: 2
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