RIP

Question 1

Which dynamic routing protocol uses distance for its vector

Answer 1

RIP and RIPv2

Question 2

What is the default interval for RIP updates

Answer 2

30 seconds

Question 3

Does RIP support VLSM

Answer 3

Only v2, V1 does not.

Question 4

What is split horizon

Answer 4

Split horizon prevents RIP from advertising a route out the same interface that it came in on.
Default it is off on serial interfaces running frame relay.

Question 5

What is a state of convergence

Answer 5

Its when all routers agree on the route information and no additional updates are needed.

Question 6

What is route poisoning aka poison reverse in RIP

Answer 6

When a router looses a network it will continue to advertise the route but with a hop count of 16.

Question 7

In RIP how many hops before a router considers the destination to be unreachable

Answer 7

15 is the max number of ‘good’ hops. At 16 the route is considered unreachable.

Question 8

When RIPv2 sends an update it sends it to what IP address

Answer 8

It sends a multicast to 224.0.0.9

Question 9

When RIPv1 sends an update it sends it to what IP address

Answer 9

It sends a broadcast to 255.255.255.255

Question 10

What command is used to configure RIPv2 or for broadcast instead of multicast

Answer 10

ip rip v2-broadcast

Question 11

What port does RIP use for its update messages

Answer 11

UDP 520

Question 12

What is the default administrative distance for RIP

Answer 12

120

Question 13

How can equal cost load sharing be configured in RIP

Answer 13

Create 2 paths to the same network with the same number of hops.

Question 14

What command allows you to easily test RIPs equal cost load sharing

Answer 14

traceroute

Question 15

What command is used to disable auto summarization

Answer 15

no auto-summary

Question 16

What is the command to delete the routes learned though a dynamic routing protocol

Answer 16

#clear ip route *
NOTE star can be replace with other variables such as RIP

Question 17

What is a passive interface in RIP

Answer 17

Its an interface that RIP advertisements are not sent out. It does not prevent that interfaces network from being included in the advertisements sent out other interfaces.

Question 18

What is the command to make an interface passive.

Answer 18

#router rip
#passive-interface [interface]

Question 19

How do you make all interfaces passive on a router

Answer 19

#passive-interface default
To make an interface not passive afterwords use 
#no passive-interface [interface]

Question 20

If a router receives 2 route advertisements for the same network, one with a /25 subnet and one with a /24 subnet, which will it use

Answer 20

It will use the /25. Routers will always use the most specific or the longest subnet.

Question 21

What commands can be used to troubleshoot rip messages.

Answer 21

#debug ip rip
Its helpful to use #clear ip route * to force RIP to send new updates.

Question 22

What command is used to configure RIP to use version 2 only

Answer 22

#router rip
#version 2

Question 23

What command is used to enable rip on a network

Answer 23

#router rip
#network [network ID]

Question 24

What administrative distance should be used to create a floating static route to be paired with a RIP dynamic route

Answer 24

121 or greater. The administrative distance of RIP is 120 so creating any static route for the same network with an administrative distance of 121 or higher will cause it to float.

Question 25

What command is used to add a routers default route to its RIP advertisements

Answer 25

default-information originate

Question 26

What command is used to modify the timers that RIP uses

Answer 26

basic timers [update sec] [invalid] [hold-down better] [flush]