Routing Protocols

Question 1

RIP

Answer 1

Distance-vector

15 max hop count

Only considers the next hop router to reach a given network or subnet (vector)

Question 2

Classful vs classless

Answer 2

Classful - don’t send subnet mask information in routing updates

Classless - include subnet mask information in routing updates

Question 3

Contiguous vs discontiguous networks

Answer 3

Contiguous network - packets sent between every pair of subnets pass through subnets of the same network.

Discontiguous network - packets sent between at least 1 subnet must pass through subnets of a different network.

Question 4

OSPF

Answer 4

Link-state

Ideal for hierarchical systems and networks

Suitable for organizations with multiple redundant paths between networks

Question 5

EIGRP

Answer 5

Hybrid/Distance-Vector

Relies on neighboring routers to report paths to remote networks

Uses a metric composed of administrator-weighted elements

Question 6

BGP

Answer 6

Path vector

External (unlike RIP / OSPF / EIGRP)

Used between routing domains in a mesh internetwork

Question 7

Exterior vs. interior routing protocols

Answer 7

Exterior (EGP) - routing outside autonomous system

Interior (IGP) - Routing within autonomous system (distance-vector / link state)

Question 8

Link-state

Answer 8

Allows a router to store the complete network topology

Assess the least-cost paths from the topology database

Question 9

Distance-Vector

Answer 9

Use the number of hops to the destination as the metric

Route with the fewest hops is the least-cost path, and the network will select it for use