CCIP Configuring BGP on Cisco Routers (BGP) : 642-661 Exam
642-661 BGP
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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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The 642-661 BGP exam is a qualifying exam for the CCIP certification. The 642-661 BGP exam tests material covered under the Configuring BGP on Cisco Routers (BGP) v 3.1 course. 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 new-world technologies.
Exam Topics
The following information provides general guidelines for the content likely to be included on the BGP exam. However, other related topics may also appear on any specific delivery of the exam.
BGP Overview
Introduction to BGP
Given a network scenario, identify appropriate BGP usage and its limitations
BGP Session Establishment
Given a typical BGP network scenario, describe the concept of BGP neighbors and the neighbor session establishment procedures
BGP Route Processing
Given a diagram of an operational BGP network, describe interdomain route processing, route propagation and BGP path selection
Basic BGP Configuration
Given a network consisting of multiple domains, successfully configure BGP
Monitoring and Troubleshooting BGP
Given a configured BGP network, verify proper operation and perform the steps necessary to correct basic BGP configuration errors
Route Selection Using Policy Controls
Multi-Homed BGP Networks
Given a customer scenario where connections to multiple ISPs must be supported, describe the need for influencing BGP route selection
AS-Path Filters
Given a customer scenario where connections to multiple ISPs must be supported, successfully configure BGP to influence route selection using AS path filters
Prefix-List Filters
Given a customer scenario where connections to multiple ISPs must be supported, successfully configure BGP to influence route selection using prefix-list filters
Outbound Route Filtering
Given an operational BGP network, use outbound route filtering to minimize the impact of BGP routing updates on router resources
Route-Maps as BGP Filters
Given a typical BGP network, correctly configure BGP to influence route selection using route maps
Implementing Changes in BGP Policy
Given a typical BGP network, configure the route-refresh feature to minimize the impact of expediting BGP policy updates
Route Selection Using Attributes
BGP Path Attributes
List BGP path attributes and functionality of each attribute Influencing BGP Route Selection with Weights
Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using the weight attribute
BGP Local Preference
Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using the local preference attribute
BGP Multi-Exit-Discriminator (MED)
Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using the Multi-Exit-Discriminator (MED) attribute
BGP Communities
Given a customer scenario where multiple connections must be supported, successfully configure BGP to influence route selection using BGP community attributes
Customer-to-Provider Connectivity with BGP
Customer Connectivity Requirements
Describe the requirements to connect customer networks to the Internet in a service provider environment
Static Routing Toward the Customer
Given a service provider network, implement customer connectivity using static routing
BGP Customer Multi-Homed to a Single Service Provider
Given a customer scenario where multiple connections to a single ISP must be supported, implement customer connectivity with BGP
BGP Customer Multi-Homed to Multiple Service Providers
Given a customer scenario where connections to multiple ISPs must be supported, implement customer connectivity with BGP
BGP Transit Autonomous System
Transit Autonomous System Functions
Describe the function of a transit autonomous system and the need for IBGP IBGP and EBGP Interaction in a Transit AS
Given a transit autonomous system, describe the interaction between EBGP and IBGP in relation to relevant BGP attributes
Packet Forwarding in Transit Autonomous Systems
Describe the function of an IGP in forwarding packets through an autonomous system
Configuring a Transit Autonomous System
Given a BGP network scenario, successfully configure an autonomous system to act as a transit backbone
Monitoring and Troubleshooting IBGP in Transit AS
Given a configured BGP transit network, verify proper operation and perform the steps necessary to correct basic IBGP configuration errors
BGP Route Reflectors
Introduction to Route Reflectors
Describe the function and operation of route reflectors in a BGP environment
Network Design with Route Reflectors
Based upon established route reflector design rules, describe the concept of hierarchial route reflectors and their requirements
Configuring and Monitoring Route Reflectors
Given an existing IBGP network, configure and verify proper operation of route reflectors to modify IBGGP split-horizon rules
Advanced BGP Configuration
Limiting the Number of Prefixes Received from a BGP Neighbor
Given a typical BGP network, successfully configure BGP to limit the number of prefixes received from a neighbor
AS-Path Prepending
Given a typical service provider network with connections to multiple autonomous systems, use AS-Path prepending to influence the return path selected by the neighboring autonomous systems
BGP Peer Group
Given a typical BGP network, use BGP peer groups to share common configuration parameters between multiple BGP peers
BGP Route Flap Dampening
Given a properly configured BGP network, use route flap dampening to minimize the impact of unstable routes
Scaling IGP and BGP in Service Provider Networks
Common Routing Issues in Service Provider Networks
Describe common routing concerns of service provider networks
Optical Networking Designs
Describe the scalability issues of using OSPF and IS-IS as interior gateway protocols in a service provider network and list solutions for each
Scaling BGP in Service Provider Networks
Describe common scalability issues when using BGP in a service provider network and list solutions for each
Exam Number/Code: 642-661
Exam Name:CCIP Configuring BGP on Cisco Routers (BGP)
“CCIP Configuring BGP on Cisco Routers (BGP)”, also known as 642-661 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtestshas assembled to take you through 121 Q&As to your 642-661 Exam preparation. In the 642-661 exam resources, you will cover every field and category in CCIP helping to ready you for your successful Cisco Certification.
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Exam DetailsThe 642-661 BGP exam is a qualifying exam for the CCIP certification. The 642-661 BGP exam tests material covered under the Configuring BGP on Cisco Routers (BGP) v 3.1 course. 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 new-world technologies.
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QUESTION 11:
Exhibit
What is the limitation of BGP?
A. AS 65101 cannot use BGP to connect to AS 65102.
B. AS 65102 cannot use MED to influence the return traffic from AS 65103.
C. AS 65102 cannot influence how AS 65103 will route traffic out to AS 65105.
D. AS 65102 cannot load balance the traffic to AS 65105 via AS 65103 and AS 65104.
E. Since AS 65102, 65103, and AS 65104 are Transit AS, they must enable
synchronization.
Answer: C
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QUESTION 12:
Exhibit:
What is the required configuration on Certkiller 2 to allow Certkiller 2 to announce the
192.168.0.0/16 prefix to Certkiller 3 via BGP?
A. router bgp 65101
neighbor 10.1.1.2 remote-as 65102
neighbor 192.168.1.2 remote-as 65101
network 192.168.1.0
auto-summary
B. router bgp 65101
neighbor 10.1.1.2 remote-as 65102
neighbor 192.168.1.2 remote-as 65101
network 192.168.0.0
!
ip route 192.168.0.0 255.255.0.0 192.168.1.2
C. router bgp 65101
neighbor 10.1.1.2 remote-as 65102
neighbor 192.168.1.2 remote-as 65101
network 192.168.0.0 mask 255.255.0.0
auto-summary
!
ip route 192.0.0.0 255.0.0.0 192.168.1.2
D. router bgp 65101
neighbor 10.1.1.2 remote-as 65102
neighbor 192.168.1.2 remote-as 65101
network 192.168.0.0 mask 255.255.0.0
!
ip route 192.168.0.0 255.255.0.0 192.168.1.2
Answer: D
Explanation: Without knowing the IGP, we must ensure that an exact route into the
routing table for the network advertised.
Wrong Answer
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1. A Auto summary would only summarize 192.168.1.0/24 and not /16
2. B Will only advertise 198.168.0.0/24 and not /16
3. C Need an exact match on route in Routing table and network command
QUESTION 13:
Exhibit:
What is the proper BGP configuration on Certkiller 3 to have Certkiller 3 announce the
172.0.0.0/8 prefix from Certkiller 4 to Certkiller 2 via BGP with a next hop of 10.1.1.1?
A. router bgp 65102
neighbor 10.2.2.1 remote-as 65103
neighbor 10.1.1.2 remote-as 65102
B. router bgp 65102
neighbor 10.2.2.1 remote-as 65103
neighbor 10.1.1.2 remote-as 65102
neighbor 10.2.2.1 next-hop-self
C. router bgp 65102
neighbor 10.2.2.1 remote-as 65103
neighbor 10.1.1.2 remote-as 65102
neighbor 10.1.1.2 next-hop-self
D. router bgp 65102
neighbor 10.2.2.1 remote-as 65103
neighbor 10.1.1.2 remote-as 65102
neighbor 10.1.1.2 update-source-self
Answer: C
Explanation: Causes next-hop to be outgoing interface to neighbor 10.1.1.2
Wrong Answer
1. A is missing Next-hop-self command
2. B This is not done at the EBGP level
3. D update-source-self invalid parameter update-source address is the proper neighbor
parameter
QUESTION 14:
Exhibit:
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Which two configuration commands will complete the BGP configuration on Certkiller 1
so it will conditionally announce the 172.0.0.0/8 to Certkiller 4 via BGP? (Choose two)
hostname Certkiller 1
!
!output omitted
!
1. _____________________
!
router bgp 65001
neighbor 172.16.1.1 remote-as 65001
neighbor 2.2.2.2 remote-as 65001
neighbor 4.4.4.4 remote-as 387
!
2. ____________________
!
A. 2. network 172.16.0.0
auto-summary
B. 2. network 172.0.0.0 mask 255.0.0.0
C. 1. ip route 172.0.0.0 255.0.0.0 null0
D. 1. ip route 172.0.0.0 255.0.0.0 null0 255
E. 1. ip route 172.0.0.0 255.0.0.0 172.16.1.1
F. 2. aggregate-address 172.0.0.9 mask 255.0.0.0
Answer: B, E
Explanation:
1. 1 E, conditional static route disappears when the link to 172.16.1.1 disappears
2. 2B, correct network command, correct mask, will not advertise when link goes down.
Wrong
1. A wrong mask need /8 this defaults to /16
2. C This is unconditional
3. D This is an unconditional floating static route
4. F should be 172.0.0.0 not 172.0.0.9
QUESTION 15:
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Exhibit:
What is wrong with the BGP configuration in the exhibit?
A. The auto-summary configuration is missing.
B. The network 10.0.0.0 statement is missing mask 0.255.255.255.
C. The network 10.0.0.0 statement is missing mask 255.0.0.0
D. The network 192.168.0.0 statement is missing mask 255.255.0.0.
E. The network 192.168.0.0 statement is missing mask 0.0.255.255
Answer: D
QUESTION 16:
Based on the following show ip bgp neighbor 10.1.1.1 output:
R1#show ip bgp neighbors 10.1.1.1
BGP neighbor is 10.1.1.1, remote AS 65103, external link
BGP version 4, remote under ID 0.0.0.0
BGP state = Active
Last read 00:00:04, hold time is 180, keepalive interval is
60 seconds
Received 44 messages, 0 notifications, 0 in queue
Sent 45 messages, 6 notifications, 0 in queue
Route refresh request: received 0, sent 0
Default minimum time between advertisement runs in 30
seconds
For address family: IPv4 Unicast
BGP table version 1, neighbor version 0
Index 2, Offset 0, Mask 0×4
0 accepted prefixes consume 0 bytes
Prefix advertised 0, suppressed 0, withdraw 0
Number of NLRIs in the update sent: max 0, min 0
Connections established 7; dropped 7
Last reset 00:05:18, due to BGP Notification received, peer
in wrong AS
External BGP neighbor may be up to 2 hops away.
No active TCP connection
What is causing the BGP session to the 10.1.1.1 neighbor to toggle between the Idle and
Active state?
A. There is an AS number configuration error.
B. The BGP neighbor 10.1.1.1 is not reachable.
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C. The EBGP-multihop value for neighbor 10.1.1.1 is set to the default value.
D. The BGP session is using the loopback interface but the update source is not set to
specify the loopback interface.
Answer: A
Explanation: The key is looking at the last section of the output. We specified the
neighbor in AS 65103 but received an error (Notification) that it is not in that AS.
QUESTION 17:
Exhibit:
R1#show ip bgp
BGP table version is 1, local router ID is 10.0.0.1
Status codes: s suppressed, d damped, h history, *valid,>best,iinternal
Origin codes: i – IGP, e – EGP,? – incomplete
Network Next Hop Metric LocPrf Wight Path
*i133.3.0.0 3.3.3.3 0 100 0 65101 i
*i172.0.0.0/8 20.1.1.5 0 100 0 65102 i
R1#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, E – EGP
i – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, * – candidate
default
U – per-user static route, o – ODR, P – periodic downloaded
staticroute
T – traffic engineered route
Gateway of last resort is not set
C 30.0.0.0/8 is directly connected, FastEthernet0/0
C 10.0.0.0/8 is directly connected, Loopback111
C 40.0.0.0/8 is directly connected, Serial0/0
Based on the exhibits show ip bg and show ip route output, what is the most likely
problem that causes the two IBGP routes NOT to be selected as the best route in the BGP
table?
A. The Weight is 0.
B. The origin code is “i,”.
C. The Metric (MED) is 0.
D. BGP synchronization is disabled.
E. The BGP next-hop is not reachable.
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Answer: E
Explanation: One of the first criteria in BGP to accept a route is that the next hop
must be reachable.
QUESTION 18:
Based on the following show ip bgp neighbors output from Certkiller 2, which two
statements are true? (Choose two)
Certkiller 2#show ip bgp neighbors
BGP neighbor is 10.1.1.5, remote AS 65101, internal link
Index 1, Offset 0, Mask 0×2
Route-Reflector Client
BGP version 4, remote router ID 5.5.5.5
BGP state = Established, table version = 4, up for
00:01:29
Last read 00:00:29, hold time is 180, keepalive interval
is 60 seconds
Minimum time between advertisement runs is 5 seconds
Received 13556 messages, 0 notifications, 0 in queue
Sent 13454 messages, 0 notifications, 0 in queue
Prefix advertised 0, suppressed 0, withdraw 0
Default weight 900
Inbound path policy configured
Route map for incoming advertisement is test
Connections established 31; dropped 30
Last reset 00:01:40, due to User reset
3 accepted prefixes consume 96 bytes
0 history paths consume 0 bytes
0 history paths consume 0 bytes
A. Certkiller 2 is a route reflector client of the 10.1.1.5 neighbor.
B. Certkiller 2 is a route reflector and the 10.1.1.5 neighbor is a client of Certkiller 2.
C. Certkiller 2 has successfully established the IBGP session with the 10.1.1.5
neighbor.
D. All the BGP updates from Certkiller 2 to the 10.1.1.5 neighbor must go through the
route-map called “test”.
Answer: B, C
Explanation:
1. B The neighbor does not know that it is a route reflector client.
2. C Certkiller 2 established the IBGP session with 10.1.1.5 . Must be IBGP because
we are using route reflectors.
Wrong Answer
1. A. Certkiller 2 is a reflector and not a client
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2. D. BGP updates from 10.1.1.5 not Certkiller 2 must go through route map test. Key
this route map is used for incoming advertisement.
QUESTION 19:
Which Cisco IOS command is used to view the amount of CPU resources consumed
(utilization) due to running BGP processes?
A. show ip bgp process
B. show memory | include BGP
C. show process cpu | include BGP
D. show ip protocols | include BGP
E. show cpu utilization | include BGP
Answer: C
Explanation: show process cpu is the command used to show cpu resources of all
processes. Piping to include show only BGP’s usage.
QUESTION 20:
Exhibit
Which two statements are true? (Choose two).
A. Certkiller 1 has accepted 20 prefixes from the 2.2.2.2 IBGP neighbor.
B. Certkiller 1 generated a warning message to the router’s console after the 2.2.2.2 IBGP
neighbor sent 16 prefixes to Certkiller 1.
C. Certkiller 1 generated a warning message to the router’s console after the 2.2.2.2 IBGP
neighbor sent 15 prefixes to Certkiller 1.
D. Certkiller 1 will drop its neighbor relationship to the 2.2.2.2 IBGP neighbor if 2.2.2.2
sends two more additional prefixes to Certkiller 1.
E. Certkiller 1 will drop its neighbor relationship to the 2.2.2.2 IBGP neighbor if 2.2.2.2
sends three more additional prefixes to Certkiller 1.
Answer: B, E
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