Tag: 642-661 bgp pdf

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Exam A
QUESTION 1
Exhibit: Certkiller router#show ip route Codes: C – connected, S – static, I – IGRP, R – RIP, M – mobile, B – BGP D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2 E1 – OSPF external type 1, E2 – OSPF external type 2, EEGP i – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, * -candidate default U – per-user static route, o – ODR T – traffic engineered route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 2 subnets B 172.16.10.0 [20/0] via 10.1.1.100, 00:00:24 B 172.16.11.0 [20/0] via 10.1.1.100, 00:00:24 172.26.0.0/28 is subnetted, 3 subnets B 172.26.1.48 [200/0] via 192.168.1.50, 00:00:31 B 172.26.1.32 [200/0] via 192.168.1.50, 00:00:31 B
172.26.1.16 [200/0] via 192.168.1.50, 00:00:31 10.0.0.0/8 is variable subnetted, 2 subnets, 2 masks B 10.0.0/8 [20/0] via 10.1.1.100, 00:00:24 C 10.1.1.0/24 is directly connected, Serial3 192.168.1.0/28 is subnetted, 3 subnets C 192.168.1.32 is directly connected, Serial1 C 192.168.1.48 is directly connected, Serial2 C 192.168.1.16 is directly connected, Serial0 192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks B 192.168.2.64/28 [20/0] via 10.1.1.100,
00:00:26
Based on the show ip route output in the exhibit, how can you tell if a BGP route is learned via IBGP or EBGP?

A.
By the Metric

B.
By the Next Hop

C.
By the Admin Distance

D.
By the code “B” or “B Ex”
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: admin distance. Distance of EBGP is 20, Distance of IBGP is 200.
QUESTION 2
What is the range of values from which an ISP can assign a private AS number?
A. 32768 to 65535
B. 64512 to 65535
C. 65101 to 65535
D. 65001 to 65535
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: An autonomous system (AS) is a collection of networks under a single technical administration. Some other definitions refer to a collection of routers or IP prefixes, but in the end they all mean the same entity. The important principle is the technical administration, which means sharing the same routing protocol and routing policy. Legal and administrative ownership of the routers does not matter in terms of autonomous systems. Autonomous systems are identified by AS numbers, 16-bit unsigned quantities ranging from 1 to 65535. Public AS numbers are assigned by Internet registries. For customers that need AS numbers to run BGP in their private networks, a range of private AS numbers (64512 – 65535) has been reserved. Reference: Configuring BGP on Cisco Routers volume 1 p.2-4
QUESTION 3
Network topology exhibit

What can prevent the corresponding BGP session from being successfully established?

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Exam A
QUESTION 1
What is the range of values from which an ISP can assign a private AS number?
A. 32768 to 65535
B. 64512 to 65535
C. 65101 to 65535
D. 65001 to 65535
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: An autonomous system (AS) is a collection of networks under a single technical administration. Some other definitions refer to a collection of routers or IP prefixes, but in the end they all mean the same entity. The important principle is the technical administration, which means sharing the same routing protocol and routing policy. Legal and administrative ownership of the routers does not matter in terms of autonomous systems. Autonomous systems are identified by AS numbers, 16-bit unsigned quantities ranging from 1 to 65535. Public AS numbers are assigned by Internet registries. For customers that need AS numbers to run BGP in their private networks, a range of private AS numbers (64512 – 65535) has been reserved. Reference: Configuring BGP on Cisco Routers volume 1 p.2-4
QUESTION 2
Network topology exhibit

What can prevent the corresponding BGP session from being successfully established?
A. Certkiller 2 and Certkiller 5 cannot establish the IBGP session because Certkiller 2 and Certkiller 5 are not directly connected.
B. Certkiller 1 and Certkiller 2 establish the EBGP session if the BGP holddown timers between the two EBGP neighbors are different.
C. Certkiller 2 and Certkiller 5 cannot establish the IBGP session using the loopback0 interface if the EBGP-multihop value is set to the default value.
D. Certkiller 1 and Certkiller 2 cannot establish the EBGP session using the loopback0 interface if the EBGP-multihop value is set to the default value.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 3
Exhibit:

How should the EBGP session between R1 and R2 be established to enable load balancing? (Choose three)
A. Use the maximum-paths2 option.

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