Instant Download Cisco : 642-661 Questions & Answers as PDF & Test Engine
Updated: Sep 23, 2026
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Cisco 642-661 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| BGP Fundamentals | 20% | - BGP session establishment and states - BGP message types and formats - BGP characteristics and operation - BGP peering configuration |
| Scaling BGP Networks | 20% | - BGP confederations - Peer groups and peer sessions - Route dampening - Route reflectors and cluster lists - Route aggregation and summarization |
| BGP Policy Control & Filtering | 25% | - Outbound Route Filtering (ORF) - AS-Path filters and regular expressions - Prefix lists and distribute lists - Route maps and policy modification |
| BGP Path Attributes & Route Selection | 25% | - Communities and extended communities - Well-known and optional attributes - Weight, Local Preference, AS-Path, Origin, MED - BGP route selection process |
| Multihoming & Advanced BGP | 10% | - Private AS number handling - Single/multiple ISP connectivity - BGP troubleshooting and monitoring |
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