In what three ways does Open Shortest Path First (OSPF) control network routing table update traffic? (Choose three.) A. It provides for partitioning networks into subdomains, called area routes.
B. It supports multicast, rather than broadcast route update messages.
C. It passes only route table changes, rather than entire tables.
D. It defines an autonomous system (AS) diameter of 15 hops.
The correct answers are:
A. It provides for partitioning networks into subdomains, called area routes.
B. It supports multicast, rather than broadcast route update messages.
C. It passes only route table changes, rather than entire tables.
Explanation:
1. Area Routes (A): By dividing a network into areas, OSPF limits the scope of routing updates, thereby reducing the amount of routing information that needs to be processed.
2. Multicast (B): OSPF uses multicast addresses to send routing updates only to OSPF routers, which minimizes unnecessary traffic on the network.
3. Incremental Updates (C): Instead of sending the entire routing table with every update, OSPF sends only the changes (link-state updates), which conserves bandwidth and processing resources.
Each of these features helps to optimize network performance and reduce the overhead of routing updates.