ICND1 OSPF Configuration 2

Question 1

Which OSPF network type is assigned by default on a Cisco Ethernet interface?

Accepted Answer

Broadcast

Answer

Ethernet interfaces default to the OSPF broadcast network type, which elects a DR and BDR.

Question 2

What is the OSPF router ID selection order when no explicit router-id is configured?

Accepted Answer

Highest loopback IP, then highest active interface IP

Answer

OSPF prefers the highest loopback IP as the router ID; if none exists, it uses the highest active physical interface IP.

Question 3

Which command changes the OSPF hello interval on an interface to 5 seconds?

Accepted Answer

ip ospf hello-interval 5

Answer

The interface-level command 'ip ospf hello-interval 5' sets the OSPF hello interval to 5 seconds.

Question 4

What happens when OSPF hello and dead timers are mismatched between two routers?

Accepted Answer

Routers cannot form an adjacency

Answer

OSPF requires matching hello and dead timers on both sides; a mismatch prevents adjacency formation.

Question 5

Which OSPF packet type is used to acknowledge receipt of LSAs?

Accepted Answer

Link-State Acknowledgment (LSAck)

Answer

LSAck packets provide reliable delivery acknowledgment for LSUs containing LSAs.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test