2.30 - Implement IPv4 RIP version 2 (RIPv2)

Question 1

What is the administrative distance of RIP?

Answer 1

120

Question 2

What port does RIPv1 and RIPv2 use to communicate?

Answer 2

UDP/520

Question 3

What 2 messages does RIP use to get routing updates?

Answer 3

Request and response messages

Question 4

What metric does RIP use?

Answer 4

Hop Count

Question 5

How is the metric used to indicate an unreachable network?

Answer 5

16 hops are considered unreachable

Question 6

How many updates must be missed before a route entry will be marked as unreachable?

Answer 6

6 update periods or 180 seconds.

Question 7

Why is a random timer associated with scheduled updates?

Answer 7

To prevent table synchronization. Update times are 25.5 and 30 seconds by default

Question 8

What is the range of this timer for scheduled updates?

Answer 8

-4.5 seconds or 15%

Question 9

What is the difference between a RIP Request message and a RIP Response message?

Answer 9

A Request message asks a router for an update. A Response message is an update

Question 10

Which two types of Request messages does RIP use?

Answer 10

Full route table or specific routes only.

Question 11

Under what circumstances will a RIP response be sent?

Answer 11

A Response is sent when the update timer expires, or upon reception of a Request message.

Question 12

Why does RIPv1 hide subnets at major network boundaries?

Answer 12

RIP updates do not include the subnet mask of the destination address, so a RIP router
depends on the subnet masks of its own interfaces to determine how an attached major
network address is subnetted. If a router does not have an attachment to a particular major network address, it has no way to know how that major network is subnetted. Therefore, no subnets of a major network address can be advertised into another major network.

Question 13

What is the purpose of the garbage collection timer?

Answer 13

It removes unreachables routes from the table upon expiration

Question 14

What is the default value of the garbage collection timer in RIP?

Answer 14

240 seconds (60 seconds longer than expiration timer)

Question 15

What is a holddown route?

Answer 15

A route entry learned from the same source as the entry already in the table but with a higher metric will be placed in holddown status

Question 16

What is the default value of the holddown timer?

Answer 16

180 seconds

Question 17

What is the command to manipulate the timers in RIP?

Answer 17

router(config-router)#timers basic

Question 18

What is a RIP triggered update?

Answer 18

When the topology changes a RIP router will send a triggered update

Question 19

Why is a random timer associated with triggered updates?

Answer 19

Prevents a “storm” of triggered updates from occuring

Question 20

What is the range of the triggered update timer?

Answer 20

1 to 5 seconds

Question 21

How do you manipulate the route metrics in RIP?

Answer 21

router(config-router)#offset-list {access-list-number | name} {in | out} offset [type number]

Question 22

What does the command ip rip triggered do?

Answer 22

It suppresses periodic RIP updates after initial route tables are complete. It only sends updates when the topology changes. Good for low speed links

Question 23

What does the command ip offset delay do?

Answer 23

Sets an interpacket gap of the indicated delay length to accommodate
processing delays between high-speed and low-speed routers.

Question 24

Which three fields are new to the RIPv2 message format over RIPv1?

Answer 24

The Route Tag field, the Subnet Mask field, and the Next Hop field.

Question 25

What is the multicast address used by RIPv2?

Answer 25

224.0.0.9

Question 26

What is the advantage of multicasting RIPv2 messages over broadcasting them?

Answer 26

Hosts and non-RIPv2 routers will ignore the multicast messages.

Question 27

What is the purpose of the Route Tag field in the RIPv2 message?

Answer 27

When another protocol is distributed into RIPv2 that protocol can use route tagging to communicate information to its peers on the other side of the RIPv2 domain.

Question 28

What is the purpose of the Next Hop field?

Answer 28

The Next Hop field is used to inform other routers of a next-hop address on the same
multiaccess network that is metrically closer to the destination than the originating router.

Question 29

What is the UDP port number used by RIPng?

Answer 29

UDP/521

Question 30

Which one feature must a routing protocol have to be a classless routing protocol?

Answer 30

A classless routing protocol does not consider the major network address in its route
lookups, but just looks for the longest match.

Question 31

Which one feature must a routing protocol have to use VLSM?

Answer 31

To support VLSM, a routing protocol must be able to include the subnet mask of each
destination address in its updates.

Question 32

Which two types of authentication are available with the Cisco RIPv2?

Answer 32

The Cisco implementation of RIPv2 supports clear-text authentication and MD5
authentication.

Question 33

Which type of authentication method is defined in RFC 2453 for RIPv2?

Answer 33

clear-text authentication

Question 34

What type of authentication is Cisco Proprietary for RIPv2?

Answer 34

MD5 authentication

Question 35

What is the multicast address for RIPng?

Answer 35

FF02::9

Question 36

What command would you use to ensure compatibility with RIPv2 if some devices on the segment are running RIPv1?

Answer 36

router(config-if)#ip rip send version [1] [2]

router(config-if)#ip rip receive version [1] [2]