Question

What OSPF command enables OSPF in area 0 on all interfaces with IP addresses starting with 10.1?

a) ospf enable area 0 ip 10.1
b) router ospf 0.0.0.0 area 0 network 10.1.0.0
c) ospf area 0 enable network 10.1.0.0
d) router ospf 1 network 10.1.0.0 0.0.255.255 area 0

Answer 1

The correct OSPF command to enable OSPF in area 0 for interfaces with IP addresses starting with 10.1 is 'router ospf 1 network 10.1.0.0 0.0.255.255 area 0'.

Step-by-step explanation:

The command that enables OSPF in area 0 on all interfaces with IP addresses starting with 10.1 is:

d) router ospf 1 network 10.1.0.0 0.0.255.255 area 0

This command is used in Cisco's router configuration mode to specify which interfaces to include in OSPF, and to define their area membership. The '10.1.0.0' is the network address, and '0.0.255.255' is the wildcard mask that corresponds to the subnet mask 255.255.0.0, which includes all the subnet IPs starting with 10.1. The 'router ospf 1' is used to start OSPF configuration and the number 1 here is the OSPF process ID, which is locally significant to the router.