Chapter 10 - Supplement - Sheet1 Flashcards Preview

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Flashcards in Chapter 10 - Supplement - Sheet1 Deck (46)
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1

IGP

Interior Gateway Protocols. Used to exchange routing information with routers in the same autonomous sytem.

2

AS

Autonomous system. Colection of networks under a common administrative domain.

3

EGP

Exeterior gateway protocols. Used to communicate between multiple autonomous systems

4

Two types of dynamic routing

IGP, EGP

5

Two types of IGP

Distance Vector, Link State

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AD

Administrative Distance. Used to rate the trustworthiness of routing information received on one router from its neighboring router. Integer from 0 - 255.

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AD = 0

Most trusted route

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AD = 255

Least trusted route. No traffic is allowed to be passed via this route.

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Default AD of a connected interface

0

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Default AD of a static route source

1

11

Default AD of EIGRP route source

90

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Default AD of IGRP route source

100

13

Default AD of OSPF route source

110

14

Default AD of RIPv1 and RIPv2 route source

120

15

Default AD of external EIGRP route source

170

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Default AD if route source is unknown

255

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Distance Vector Protocols

Finds the best path to a remote network by judging distance in hops. Fewest hops = best route

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Examples of vector protocols

RIP, RIPv2, Interior Gateway Routing Protocol (IGRP)

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Link State Protocols

Classess protocol. Routers have three tables, 1 for directly attached neighbors, 1 for topology of entire internetwork, 1 is actual routing table. Has more information about a network than any distance vector protocol

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Examples of link state protocols

OSPF and IS-IS

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Routing by Rumor

Distance vector protocol has routers pass on their routing tables to their neighbors, which combine the data with their own table and pass that on to their neighbors. All routers believe the info without verification.

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3 Metrics kept by converged routers

Remote network number, interface used to send packets, hop count to the network

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Converged

Distance Vector protocol Routers are considered converged when their routing tables are complete

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RIP

Distance vector protocol. Sends complete routing table every 30 seconds. Uses hop count.

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Max allowable hop for RIP

15

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Differences between RIPv1 and RIPv2

RIPv2 is classless (sends subnet info w/each update so can be used with devices on different subnets), uses multicase instead of broadcasts, supports VLSM networks, allows MD5 auth, supports discontiguous networks, RIPv1 sends broadcasts every 30 seconds. RIPv2 sends multicasts.

27

VLSM

Variable length subnet masking. Allows for different subnet masks for different router interfaces.

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Classful Routing

Routers update without the subnet mask. For example, a network 172.16.0.0 could be 172.16.10.0/24 and another could be 172.16.20.0/24. With classful routing, the routers don't consider subnet mask, creating potential confusion.

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Classless Routing

Routers update with the subnet mask.

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EIGRP

Enhanced IGRP (Interior Gateway Routing Protocol)