IP Routing Essentials - Routing Protocol Overview

7 important questions on IP Routing Essentials - Routing Protocol Overview

What are the 5 most common dynamic routing protocols?

1. Routing Information Protocol Version 2 (RIPv2)
2. Enhanced Interior Gateway Routing Protocol (EIGRP)
3. Open Shortest Path First (OSPF)
4. Intermediate System to Intermediate System (IS-IS)
5. Border Gateway Protocol (BGP)

How do Distance Vector routing protocols build their perspective of the network.

They build solely on the information they get from their neighbors. They don't have a complete map of the network.

EIGRP uses the Diffusing Update Algorythm (DUAL) as an enhanced distance vector algorythm. What 5 enhancements does this algortyhm introduce?

1. Rapid Convergence with changes in the network.
2. It only sends updates when there is a change. No periodic full routing table updates.
3. It uses Hellos and forms neighbor relationships.
4. It uses bandwidth, delay, reliability, load and MTU for path calculations.
5. It has the option to load balance traffic across equal and unequal cost paths.
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What are Link-State advertisements (LSAs) and Link-State Packets (LSPs) and what do they contain.

They are OSPF and IS-IS advertisements respectively. They contain the links state and link metric for every directly connected link and routers.

What are OSPF Link-State Advertisements and IS-IS Link-State Packets used for?

To build the LSDB, or Link-State Database, which basically is a synchronized and identical map of the network the routers are a part of.

What algorythm is used for OSPF?

Dijkstra Shortest Path First algorythm

The Exterior Gateway Protcol BGP is a Path Vector Protocol, which is similar to a Distance Vector Protocol. What is the main difference?

Instead of looking at distance it looks at various BGP path attributes. Including AS_Path, multi-exit discriminator (MED), origin, next hop, local preference, atomic aggregate and aggregator.

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