Module 5 - IP Routing Protocol Basics

Question 1

What are the dynamic routing protocols?

Answer 1

• OSPF
• IS-IS
• RIP
• BGP

Question 2

What are the Interior Gateway Protocols (IGP) ?

Answer 2

• RIPv1
• RIPv2
• OSPF
• IS-IS

Question 3

What are the link-state protocols?

Answer 3

• OSPF

- IS-IS

Question 4

What are the Distance Vector based protocols?

Answer 4

• RIPv1

- RIPv2

Question 5

What are the OSPF Packet Types?

Answer 5

1. Hello
2. Database Description
3. Link-State Request
4. Link-State Update
5. Link-State ACK

Question 6

What are the 7 possible OSPF Adjacency states between two routers?

Answer 6

1. Down - Neighbor not discovered, not included
2. Initializing - One-Way communication verified via Hello messages
3. 2-way - Two-Way communication verified via Hello messages
4. Exstart - MTU compatibility being verified via DbD messages
5. Exchange - LSA list being exchanged via DBD messages
6. Loading - Exchanging LSAs via LSU (Update)
7. Full - Link-state databases are fully synchronized

Question 7

What are the characteristics of a distance vector protocol?

Answer 7

• Frequent Periodic Updates (slow convergence)
• passes copies of routing table to neighboring routers
• views the network topology from the neighbor’s perspective
• the path with the lowest hop count (shortest distance) is the best path

(e.g. RIP)

Question 8

What are the characteristics of a link-state protocol?

Answer 8

• event-triggered updates (faster convergence)
• passes link-state routing updates to other routers
• all routers get a common view of the entire network topology
• uses the SPF algorithm. Path with the lowest cost is the best path