Cn Chapter 7

Front 1

what is routing?

Back 1

Sending packets from one device toanother device on a different network

Front 2

A router interconnects---

Back 2

networks

Front 3

Routers do not care about --- theyonly care about networks and the best path to each networks

Back 3

hosts

Front 4

•Routers look at the --of adestination IP address to route the packet to its destination.

Back 4

network portion

Front 5

A router needs toknow

Back 5

•DestinationIP address.

•Neighborrouters which it can learn about remote networks.

•Possibleroutes to all remote networks.

•Thebest route to each remote network.

•Howto maintain and verify routing information.

Front 6

•Ifa ---is directly connected to the router, the router already knows how toget to it.

Back 6

network

Front 7

•Ifa network is not directly connected to the router there are two options---

Back 7

•Someoneby hand must program all network locations into the routing table – Static Routing!!

•Onerouter communicate with other neighbor routers using the same protocol . All routers can dynamically update thenetwork information in their routing table upon changes. This is called DynamicRouting!!

Front 8

•Wecan use both --- in a large network.

Back 8

Static Routing and Dynamic Routing

Front 9

••--send packets with a remote destination network not in the routing tableto the next-hop router.

Back 9

Defaultrouting--else example

Front 10

•Youshould use default routing on networks with --- out of thenetwork, because you can easily create---with default routing.

Back 10

only one exit path

loops

Front 11

•By---we need to manually enter the routing informationfor remote networks into the routing table for every router. This is anightmare to maintain a large network. Even worse, with a small change, we mayhave to update the routing table for every router.

Back 11

static routing only,

Front 12

•--- is when protocols are used to find networks and update routing tableson routers. This is easier than using staticrouting and default routing.

Back 12

Dynamicrouting

Front 13

•---- is used to rate the trustworthiness ofrouting information received ona router from a neighbor router. Or you can think of it as a priority.It ranges --- where ---is the most trusted and ----means no trafficwill be passed via this route.

Back 13

AdministrativeDistance (AD):

0 to 255

0

255

Front 14

•Ifa router receives two updates (or routes) regarding the same remote network,the router will select the one with ----as the entry to the network inits routing table.

Back 14

lower AD

Front 15

•Ifa router receives two routes regarding the same remote network with the sameAD, the router will make the decision based on the routing protocol metric, such as ----

Back 15

hop count or bandwidth of the lines. •

Front 16

•Ifa router receives two routes regarding the same remote network with the same ADand same metric value, a ---will be done. •

Back 16

load-balance

Front 17

Default AD table

0=

1=

120=

Back 17

connected interface

static route

RIP

Front 18

•The---find the best path to a remote network by judgingdistance. Each time a packet goes through a router, that’s called ----. The route with the least number of hopsto the network is determined to be the best ----

Back 18

distancevector routing protocols

hop

route. •Example:RIP

Front 19

•Routers with ----send updates containing the state of their ownlinks to all other routers on the network.

Back 19

Link-State protocol

•Example:OSPF(Open Shortest Path First)

Front 20

Link-State protocols, also called ---

Back 20

shortest-path-first protocols

Front 21

•---use aspects of both distance vector and link state.

Back 21

Hybridprotocols

•Example:EIGRP(EnhancedInterior Gateway Routing Protocol)

Front 22

•RIPis a--

Back 22

true distance-vector routing protocol.

Front 23

RIP sends the complete routingtable out to all active interfaces every ---.

Back 23

30 seconds

Front 24

RIP only uses --- todetermine the best way to a remote network, but it has a maximum allowable hopcount ---15 at default.

Back 24

hop count

15

Front 25

•RIPV1Vs. RIPV2

•Version1 requires the same ---used for all networks.

•V2 Youcan use version with different subnet masks for different ---

Back 25

subnet mask

networks.