Which protocol is commonly used for dynamic routing within an autonomous system?

Which protocol is commonly used for dynamic routing within an autonomous system?

• A. DNS.
• B. OSPF.
• C. ARP.
• D. SSL.

Answer: (B)

Dynamic routing inside an autonomous system relies on protocols that let routers automatically share reachability information and compute efficient paths. OSPF fits here because it’s a link-state routing protocol designed for IP networks within a single administrative domain. It builds a complete map of the network by exchanging link-state advertisements, then uses Dijkstra’s algorithm to determine the least-cost paths to all destinations. It scales well through a hierarchical area design, supports fast convergence, and uses multicast updates to limit routing traffic to interested routers. This combination—accurate network topology awareness, efficient path calculation, and scalable structure—is why OSPF is a common internal routing protocol. DNS translates host names to IP addresses, ARP resolves MAC addresses on a local network, and SSL provides encryption for sessions—none of these handle dynamic routing within an autonomous system.

Dynamic routing inside an autonomous system relies on protocols that let routers automatically share reachability information and compute efficient paths. OSPF fits here because it’s a link-state routing protocol designed for IP networks within a single administrative domain. It builds a complete map of the network by exchanging link-state advertisements, then uses Dijkstra’s algorithm to determine the least-cost paths to all destinations. It scales well through a hierarchical area design, supports fast convergence, and uses multicast updates to limit routing traffic to interested routers. This combination—accurate network topology awareness, efficient path calculation, and scalable structure—is why OSPF is a common internal routing protocol.

DNS translates host names to IP addresses, ARP resolves MAC addresses on a local network, and SSL provides encryption for sessions—none of these handle dynamic routing within an autonomous system.