Single-Area OSPFv2 Configuration Flashcards
7 cards from real Cisco CCNA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Single-Area OSPFv2 Configuration flashcards as text
A router is configured with 'router ospf 1' and 'network 10.1.1.0 0.0.0.255 area 0'. What does the wildcard mask 0.0.0.255 specify?
Answer: Any interface with an IP in the 10.1.1.0/24 range participates in OSPF
The wildcard mask 0.0.0.255 matches any IP address in the 10.1.1.0/24 range, enabling OSPF on those interfaces.
Which OSPF packet type is used to discover and maintain neighbor relationships?
Answer: Hello
Hello packets are sent periodically to discover neighbors and maintain adjacencies by confirming the neighbor is still reachable.
What is the default OSPF Hello interval on a broadcast multi-access network?
Answer: 10 seconds
The default Hello interval on broadcast multi-access networks (like Ethernet) is 10 seconds.
A network administrator uses 'ip ospf 1 area 0' on an interface instead of the 'network' command. What is the result?
Answer: Only that specific interface is enabled for OSPF area 0
The interface-level 'ip ospf process-id area area-id' command enables OSPF directly on that specific interface.
What happens when two OSPF neighbors have mismatched Hello intervals?
Answer: The routers will not form an OSPF adjacency
OSPF requires Hello and Dead intervals to match between neighbors; mismatched timers prevent adjacency formation.
An OSPFv2 router has the following loopback interfaces: Lo0 = 1.1.1.1/32, Lo1 = 2.2.2.2/32. No manual router-id is configured. What is the router ID?
Answer: 2.2.2.2
When no manual router ID is set, OSPF selects the highest IP address among all loopback interfaces.
Which command verifies that OSPF is advertising the correct networks to neighbors?
Answer: show ip ospf database
The 'show ip ospf database' command displays the LSDB contents, showing which networks are being advertised via LSAs.