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Testking CCIP 642-661

Configuring BGP on Cisco Routers Exam

Exam Number: 642-661
Associated Certifications: CCIP
Duration: 90 minutes (50-60 questions)
Available Languages: English
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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” Answer: C
Explanation: admin distance. Distance of EBGP is 20, Distance of IBGP is 200.

TK

642-661

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
Answer: B 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?

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.

TK

642-661

Answer: D

QUESTION 4:

Exhibit:

How should the EBGP session between R1 and R2 be established to enable load balancing? (Choose three)

A. Use the maximum-paths 2 option. B. Use the ebgp-multihop 2 option.
C. Use static routes on R1 and R2 to reach the other router’s loopback.
D. Establish a single EBGP session using the loopback0 interface IP address on R1 and R2.
E. Establish twp EBGP sessions using both the S0 and S1 interface IP address on R1 and R2. Answer: B, C, D
Explanation:
1. B R1 – R2 requires a EBGP ebgp-multihop of 2.
2. C Requires two static routes going to each other router loopback interface
3. D A BGP session of course is required. Only a single connection is required. Use the loopback is what allows things to work even during a failure
Wrong Answer
1. A This is not required because there is only on EBGP path. Would need two if static routes were not define and were going between different routers
2. E Not an efficient way of doing things requires double the tables and bandwidth for updates

QUESTION 5:

Which two statements are true about an EBGP session or an IBGP session? (Choose two.)

A. IBGP uses AS-Path to detect routing information loops within the AS.
B. EBGP routes have a default Admin Distance of 20 and IBGP routes have a default
Admin Distance of 200.
C. No BGP attributes are changed in EBGP updates except for the next-hop attribute if next-hop-self is configured.
D. Routes learned from an EBGP peer not advertised to another EBGP peer to prevent routing information loops.
Exam 642-661: Configuring BGP on Cisco Routers (BGP)

Related Certifications: CCIP

Number of Questions: 50-60

Duration: 90 minutes

Exam Topics Include:

BGP Overview, Including Session Establishment and Configuration
Route Selection Using Policy Controls
Route Selection Using Attributes
Classification and Marking
Customer-to-Provider Connectivity with BGP
BGP Transit Autonomous System
BGP Route Reflectors
Advanced BGP Configuration
Scaling IGP and BGP in Service Provider Networks
The 642-661 Border Gateway Protocol exam is a qualifying exam for the CCIP certification. The BGP exam assesses a candidate’s understanding of the theory of BGP, ability to configure BGP on Cisco IOS routers, and skills with troubleshooting on BGP. As a routing protocol, BGP is one of the underlying foundations of the Internet and is in prevalent in both ISP and customer networks.

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