Routing

Question 1

Default Route

Answer 1

Tells the router what to do with every incoming packet unless another line in routing table gives another route.

Question 2

Routing Metrics

Answer 2

Hop Count

Bandwidth

Delay

Cost

Question 3

Distance Vector

Answer 3

Set of routiing protocols that calculates the total cost to get to a particular network ID and compares that to the total cost of all the other routes to get to that same network ID.

Distance Vector uses hop count as a metric

Question 4

Autonomous System (AS)

Answer 4

is one or more networks that are governed by a single dynamic routing protocol within that AS.

AS do not use IP addresses to deliver data between each other, but use a special globally unique Autonomous System Number (ASN). Current ASN’s are 32 bits, displayed as two 16-bit numbers separated by a dot. i.e. 1.33457

Question 5

BGP

Answer 5

Border Gateway Protocol - An exterior gateway routing protocol that enables groups of routers to share routing information so that efficient, loop-free routes can be established.

Used for communication between AS’s

The net+ exam lists BGP as a hybrid routing protocol, but it is technically a path vector protocol

Question 6

Link State

Answer 6

Type of dynamic routing protocol that announces only changes to routing tables, as opposed to entire routing tables, unlike Distance Vector protocols.

Question 7

OSPF

Answer 7

An IGP developed for IP networks based on the shortest path first or link state algorithim.

OSPF’s metric is cost, which is a function of bandwidth.

OPSFv4 is used for IPv4

OSPFv3 is used for IPv6

In OSPF Area 0 is called the backbone area

Question 8

IS-IS

Answer 8

Intermediate System to Intermediate System (IS-IS)

A dynamic link state protocol

Question 9

EIGRP

Answer 9

Enhanced Interior Gateway Routing Protocol

EIGRP has aspects of both distance vector and link state protocols, placing it uniquely in its own “hybrid” category.

The Net+ exam lists EIGRP as a distance vector protocol