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Cisco 642-661 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Scaling BGP Networks | 20% | - Route aggregation and summarization - Route reflectors and cluster lists - Route dampening - BGP confederations - Peer groups and peer sessions |
| Topic 2: BGP Fundamentals | 20% | - BGP message types and formats - BGP characteristics and operation - BGP peering configuration - BGP session establishment and states |
| Topic 3: BGP Policy Control & Filtering | 25% | - Prefix lists and distribute lists - Route maps and policy modification - AS-Path filters and regular expressions - Outbound Route Filtering (ORF) |
| Topic 4: BGP Path Attributes & Route Selection | 25% | - BGP route selection process - Weight, Local Preference, AS-Path, Origin, MED - Communities and extended communities - Well-known and optional attributes |
| Topic 5: Multihoming & Advanced BGP | 10% | - BGP troubleshooting and monitoring - Single/multiple ISP connectivity - Private AS number handling |
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