300-320 · Question #625
An office has requested to set up a backup link to the internet. Which routing protocol helps to achieve multihorming with two different ISPs?
The correct answer is C. eBGP. BGP (Border Gateway Protocol) is the only routing protocol designed for internet multihoming - connecting to multiple ISPs simultaneously. When an office connects to two different ISPs, each ISP belongs to a different Autonomous System (AS). eBGP (external BGP) is the specific…
Question
An office has requested to set up a backup link to the internet. Which routing protocol helps to achieve multihorming with two different ISPs?
Options
- ABGP
- BIS-IS
- CeBGP
- DEIGRP
How the community answered
(55 responses)- A4% (2)
- B2% (1)
- C93% (51)
- D2% (1)
Explanation
BGP (Border Gateway Protocol) is the only routing protocol designed for internet multihoming - connecting to multiple ISPs simultaneously. When an office connects to two different ISPs, each ISP belongs to a different Autonomous System (AS). eBGP (external BGP) is the specific form of BGP used for peering between different AS numbers, making it the precise answer here. While option A (BGP) is the broader protocol family, option C (eBGP) is more accurate because both ISP connections inherently involve external BGP sessions crossing AS boundaries. IS-IS (B) and EIGRP (D) are Interior Gateway Protocols used within a single organization's network and cannot be used for inter-ISP multihoming.
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