What are two features of Open Shortest Path First (OSPF)? (Choose two.)

Open Shortest Path First (OSPF) is a link-state Interior Gateway Protocol (IGP). A core function of OSPF is to calculate the shortest path to a destination based on a cumulative metric called "cost." The cost is typically derived from the interface's bandwidth, and the path with the lowest total cost is installed in the routing table. As a dynamic routing protocol, OSPF continuously monitors the network topology. When a change occurs, such as a link failure, routers exchange Link State Advertisements (LSAs) to update their topological databases and recalculate the best routes, ensuring the routing table remains current and accurate.

A. OSPF is a link-state protocol, which builds a complete map of the network topology, unlike distance-vector protocols (e.g., RIP) that rely on hop counts.

C. Route redistribution between OSPF and other routing protocols is a manual configuration process performed by a network administrator; it is not automatic.

E. OSPF is an Interior Gateway Protocol (IGP) used for routing within an Autonomous System (AS), not an Exterior Gateway Protocol (EGP) like BGP, which routes between ASes.

1. RUCKUS FastIron Layer 3 Routing Configuration Guide, 08.0.95, Chapter 18: OSPF Overview, Page 429.

"OSPF is a link-state routing protocol..." (Confirms A is incorrect).

"The cost of a route is described in terms of a metric. OSPF uses a reference bandwidth of 100 Mbps for cost calculation." (Confirms B is correct).

"When the topology of an OSPF internetwork changes, link-state advertisements (LSAs) are flooded throughout the network." (Confirms D is correct).

"OSPF is an Interior Gateway Protocol (IGP)." (Confirms E is incorrect).

2. IETF RFC 2328, OSPF Version 2, Section 1.2, "Protocol overview".

"OSPF is a dynamic routing protocol. It will quickly detect topological changes in the AS (such as router interface failures) and calculate new loop-free routes after a period of convergence." (Confirms D is correct).

"OSPF is a link-state routing protocol." (Confirms A is incorrect).

3. RUCKUS FastIron Layer 3 Routing Configuration Guide, 08.0.95, Chapter 20: Route Redistribution, Page 511.

This chapter details the manual commands, such as redistribute, required to configure the exchange of routing information between different protocols, demonstrating that the process is not automatic. (Confirms C is incorrect).