CompTIA Network+ (N10-009)Network ImplementationMedium
A mid-sized company obtains its own public autonomous system number and establishes BGP peering sessions with two different ISPs to provide internet redundancy. Which term best describes this network design?
- ATransit peering only
- BMultihoming
- CRoute redistribution
- DFull-mesh peering
Show answer & explanationAnswer & explanation
Correct answer: B. Multihoming
Multihoming refers to connecting a network to two or more ISPs using BGP to provide redundancy and improved fault tolerance, which matches the scenario of a company peering with two separate providers under its own AS.
Why the other options are wrong
- A. Transit peering describes the relationship type (paying for internet access), not the redundancy architecture itself.
- C. Route redistribution involves exchanging routes between different routing protocols, not ISP connectivity design.
- D. Full-mesh peering describes iBGP router interconnection within a single AS, not multi-ISP connections.
BGP Multihoming
A network design where an organization connects to two or more ISPs, typically using its own AS number and BGP, to achieve redundancy and avoid a single point of failure.
- Requires a public ASN for BGP peering
- Improves availability if one ISP link fails
- Common for enterprises and data centers
Memory trick: Multihomed = many homes (ISPs) for the same network.