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CCIP Configuring BGP on Cisco Routers (BGP) : 642-661 Exam

Exam Number/Code: 642-661
Exam Name: CCIP Configuring BGP on Cisco Routers (BGP)
VUE Code: 642-661
Questions Type: Single choice,
Real Exam Question Numbers: 50-60 questions
Exam Language(s): English

Exam Description Introduction
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

“CCIP Configuring BGP on Cisco Routers (BGP)”, also known as 642-661 exam, is a Cisco certification.
Preparing for the 642-661 exam Searching 642-661 Test Questions, 642-661 Exam, 642-661 Dumps

With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 121 questions 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.

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.

QUESTION 21:
Exhibit, show ip bgp neighbor 10.1.1.1
Output
What is causing the BGP session to the 10.1.1.1 neigbor to remain in the Idle state?
A. There is an AS number configuration error
B. The EBGP-multihop value for neighbor 10.1.1.1 is set to the default value.
C. There is an access-list blocking TCP port 179 traffic between the two BGP neighbors.
D. The BGP session is using the loopback interface but the update-source is not set to
specify the loopback interface.
Answer: B
QUESTION 22:
Based on the following show ip bgp neighbor 10.1.1.1 output, what is the neighbor
relationship?
CK1 #show ip bgp neighbor 10.1.1.1
BGP neighbor is 10.1.1.1, remote AS 65002, external link
Index 2, Offset 0, Mask 0×4
BGP version 4, remote router ID 12.1.2.3
Neighbor under common administration
BGP state = Established, table version = 5, up for 00:09:15
Last read 00:00:16, hold time is 180, keepalive interval is 60 seconds
Minimum time between advertisement runs is 30 seconds
Received 13 messages, 0 notifications, 0 in queue
Sent 13 messages, 0 notifications, 0 in queue
Prefix advertised 1, suppressed 0, withdrawn 0
Connections established 1; dropped 0
Last reset never
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1 accepted prefixes consume 32 bytes
0 history paths consume 0 bytes
External BGP neighbor may be up to 255 hops away
A. Neighbor 10.1.1.1 is a regular EBGP neighbor.
B. Neighbor 10.1.1.1 is am Intra-Confederation IBGP neighbor.
C. Neighbor 10.1.1.1 is an Intra-Confederation EBGP neighbor.
D. Neighbor 10.1.1.1 is an IBGP neighbor that belongs to the same AS as CK1 .
E. Neighbor 10.1.1.1 is an IBGP neighbor that belongs to the same Member As CK1 .
Answer: C
QUESTION 23:
What is wrong with the following BGP configuration?
!
interface loopback0
ip address 1.1.1.1 255.255.255.255
!
interface s0
ip address 172.16.1.2 255.255.255.0
!
interface e1
ip address 10.1.1.1 255.255.255.0
!
interface e2
ip address 10.1.2.1 255.255.255.0
!
router bgp 65101
neighbor 172.16.1.1 remote-as 65102
neighbor 3.3.3.3 remote-as 65101
neighbor 3.3.3.3 update-source loopback0
network 10.1.0.0 mask 0.0.255.255
no auto-summary
!
router eigrp 100
network 10.0.0.0
network 1.0.0.0
A. The network 10.1.0.0 mask 0.0.255.255 statement is wrong.
B. The auto-summary configuration statement is missing under router bgp 65101.
C. The neighbor 3.3.3.3 ebgp-multihop 2 configuration statement is missing under
router bgp 65101.
D. The neighbor 172.16.1.1 ebgp-multihop 2 configuration statement is missing
under router bgp 65101.
E. The neighbor 3.3.3.3 remote-as 65101 and the neighbor 3.3.3.3 update-source
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loopback0 configuration statements should be changed to neighbor 1.1.1.1 remote-as
65101 and neighbor 1.1.1.1 update-source loopback0.
F. The loopback0 interface IP address should be 3.3.3.3 255.255.255.255.
Answer: A
Explanation:
BGP doesn’t use reverse mask like access lists. The correct command would be network
10.1.0.0 mask 255.255.0.0
QUESTION 24:
AS 65101 is a dual home customer. When starting the EBGP sessions with both ISPs
announcing its networks, which two statements are true about the default behavior of
BGP? (Choose two)
A. The default BGP route selection prefers the shortest AS-Path.
B. If the AS-Paths are equal in length, BGP prefers the route from the peer with the
highest router ID.
C. The bandwidth available to reach the ISPs is not taken into consideration in the BGP
path selection process.
D. Using the default BGP “maximum-paths” of 4, BGP can load balance the outbound
traffic from the multihomed customer between the two ISPs.
Answer: A, C
Explanation: Route selection is > W, > LP, local, shortest AS, < origin cod i MED, ext over interior, closest neighbor, IP address, BGP router ID
1. A default route selection is shortest AS-path
2. C bandwidth is not taken into consideration at all
Wrong
1. B Lowest RID
2. D default is one
QUESTION 25:
DRAG DROP
Network X originates in AS 65103. Select the correct AS Path information for the
Network X update and drag it into the appropriate box.
Some of the AS-Paths listed will not be used.
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Answer:
Explanation:
From Top left going clockwise
1. Box 1 65102 65103 R1-R2
2. Box 2 (62 63) 65103 AS 61-AS 62
3. Box 3 (63) 65103 Confed AS 62
4. Box 4 65103