Which protocol is an Interior Gateway Protocol used to route traffic within a single autonomous system?

Which protocol is an Interior Gateway Protocol used to route traffic within a single autonomous system?

• A. NAT Network Address Translation
• B. IGP Interior Gateway Protocol
• C. EGP Exterior Gateway Protocol
• D. BGP Border Gateway Protocol

Answer: (B)

Routing inside one administrative domain is handled by an Interior Gateway Protocol. The question asks about routing traffic within a single autonomous system, so the protocol that fits this role is an IGP. IGPs like OSPF, RIP, or EIGRP focus on discovering and maintaining routes inside the same AS, prioritizing fast convergence and consistent path selection within that domain. NAT is not a routing protocol at all; it translates addresses rather than routes. Exterior Gateway Protocols, such as Border Gateway Protocol, are used to exchange routing information between different autonomous systems, not inside a single AS.

Routing inside one administrative domain is handled by an Interior Gateway Protocol. The question asks about routing traffic within a single autonomous system, so the protocol that fits this role is an IGP. IGPs like OSPF, RIP, or EIGRP focus on discovering and maintaining routes inside the same AS, prioritizing fast convergence and consistent path selection within that domain.

NAT is not a routing protocol at all; it translates addresses rather than routes. Exterior Gateway Protocols, such as Border Gateway Protocol, are used to exchange routing information between different autonomous systems, not inside a single AS.