Exam: 642-661

Vendor Cisco
Certification CCIP
Exam Code 642-661
Exam Title Configuring BGP on Cisco Routers (BGP)
No. of Questions 204
Last Updated Apr 25, 2024
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642-661 BGP
 Configuring BGP on Cisco Routers Exam
 
 Exam Number: 642-661

 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



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