OSPF Packet Types

Question 1

A router will send out and listen for these when OSPF is enabled on an interface

Answer 1

Hello Packets

Question 2

Once adjacencies have been formed, OSPF will then start sending these out

Answer 2

Database Description Packets (DBD)

Question 3

This is the step when adjacent routers will tell each other the networks they know about with this type of packet

Answer 3

Database Description Packets (DBD)

Question 4

If a router is missing information about any of the networks it received in the DBD, it will send the neighbor one of these

Answer 4

Link State Request (LSR)

Question 5

This is a routers response to a Link State Request (LSR) asking for more information

Answer 5

Link State Advertisement (LSA)

Question 6

These packets contain routing updates

Answer 6

Link State Advertisements (LSA)

Question 7

These packets contain a list of Link State Advertisements (LSAs) which should be updated and that will be used during flooding

Answer 7

Link State Updates (LSU)

Question 8

Scenario: If a new link was added to the network or if a link went down and new information needs to get flooded everywhere so all routers can know about it this type of packet would be processed

Answer 8

Link State Update (LSU)

Question 9

Receiving routers acknowledge Link State Advertisements (LSA) through these types of packets

Answer 9

Link State Acknowledgements (LSAck)