300-420 Question #55: Real Exam Question with Answer & Explanation

Question

A company is running BGP on a single router, which has two connections to the same ISP. Which BGP feature ensures traffic is load balanced across the two links to the ISP?

Options

• AMultihop
• BMultipath Load Sharing
• CNext-Hop Address Tracking
• DAS-Path Prepending

Explanation

{"question_number": 10, "question": "Which BGP feature ensures traffic is load balanced across the two links to the ISP?", "correct_answer": "B", "explanation": "BGP Multipath Load Sharing allows a router to install multiple BGP paths to the same destination prefix in the routing table simultaneously and distribute traffic across them. Normally, BGP selects only one best path. With multipath enabled (using 'maximum-paths' in the BGP configuration), when two paths have equal attributes (same AS-path, MED, etc.) - as is the case with two links to the same ISP - BGP can load balance across both links. Multihop (A) extends BGP sessions to non-directly connected peers. Next-Hop Address Tracking (C) speeds up BGP convergence when the IGP next-hop changes. AS-Path Prepending (D) artificially lengthens the AS-path to make a route less preferred, used for inbound traffic engineering, not load balancing.", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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