Module 2

Question 1

A 32-bit value represented as an IPv4 address, used to uniquely identify an OSPF router

Answer 1

OSPF router ID

Question 2

Rate the router ID criteria based on their preferential order:

• The router ID is explicitly configured using the OSPFrouter-idridrouter configuration mode command.
• The router chooses the highest active IPv4 address of any of its physical interfaces.
• The router chooses the highest IPv4 address of any of configured loopback interfaces.

Answer 2

1,3,2

Question 3

Typically the inverse of the subnet mask configured on that interface

Answer 3

Wildcard Mask

Question 4

Which command should be used to prevent the transmission of routing messages through a router interface, but still allow that network to be advertised to other routers.

Answer 4

passive-interface

Question 5

The ___ is responsible for collecting and distributing LSAs sent and received. It uses the multicast IPv4 address 224.0.0.5 which is meant for all OSPF routers.

Answer 5

Designated Router (DR)

Question 6

The ___ listens passively and maintains a relationship with all the routers. If the DR stops producing Hello packets, it promotes itself and assumes the role of DR

Answer 6

Backup Designated Router

Question 7

OSPFv2 neighbor state where a DR or BDR router is fully adjacent with a non-DR or BDR router, and they can exchange Hello packets, updates, queries, replies, and acknowledgments

Answer 7

FULL/DROTHER

Question 8

OSPFv2 neighbor state where the router is fully adjacent with the DR neighbor, allowing them to exchange Hello packets, updates, queries, replies, and acknowledgments.

Answer 8

FULL/DR

Question 9

OSPFv2 neighbor state where the router is fully adjacent with the BDR neighbor, allowing them to exchange Hello packets, updates, queries, replies, and acknowledgments.

Answer 9

FULL/BDR

Question 10

OSPFv2 neighbor state where a non-DR or BDR router has a neighbor relationship with another non-DR or BDR router, and they only exchange Hello packets

Answer 10

2-WAY/DROTHER

Question 11

If the interface priorities are equal on all routers, the router with the ____ router ID is elected the DR.

Answer 11

highest

Question 12

Period that the router waits to receive a Hello packet before declaring the neighbor down

Answer 12

Dead Interval

Question 13

Default timer for Hello and Dead intervals

Answer 13

10 and 40 seconds