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29 Cards in this Set

  • Front
  • Back

RIPv2 has what features?

VLSM - by default


Tagging - tag routes for redistributed routes, not internal routes


Authentication - supports clear text and MD5Multicasting 224.0.0.9


Can advertise another next-hop if the next-hop is in the same subnet


Triggered Updates

Describe the RIP packet at network and transport layer.

Multicast 224.0.0.9 UDP 520

Describe how RIP handles updates. Explain Route poisoning. What qualifications are necessary for RIP to accept update immediately?

Sends updates every 30 seconds. Will send triggered update when it needs to poison a route or route change. In order to accept update immediately it must come from same next-hop

What is split horizon with poison reverse? Does RIP support? What interfaces is poison reverse disabled on?

Split Horizon tells router not to advertise routes back to where it got them from. Poison reverse tells router to send but with max metric.


Frame Relay physical and multipoint interfaces

What is the RIP metric and max metric? How is interface metric computed? Will a router accept route with metric of 15?

Each interface is 1. The max is 16.




It is computed as the route leaves the interface.




Yes, it will accept 15 and advertise as 16 when it leaves the router. The downstream will not accept.

How to change the RIP metric?

The RIP metric can only be changed with offset-list as it is leaving the router.

What are the rip timers? How to change?

Update - 30


Invalid - 180


Holddown - 180 after Invalid


Flush - 240 after invalid




router rip


timers basic (update) (invalid) (holddown) (flush) [sleeptime]

What is the invalid, holddown, and flush timer?

Invalid starts as soon as route is received. If no update then the route is moved to holddown.




During holddown I won't accept any updates unless it poisons the route. And I will send triggered updates to neighbors poisoning the route.




Flush timer starts with the update. At end of flush timer I remove the route.

Will the router still use the route during invalid and holddown period?

Yes it will.

What are the two RIP messages and there purpose?

RIP request and RIP response. Request is used to ask for routing table.

What causes a RIP Request to be generated?

This happens when RIP interface comes up, clear ip route *, or RIP process starts. I think the RIP response is the update.

Can interfaces be added to RIP with the network mask? e.g. network 172.16.1.0 mask 255.255.255.0

No, interfaces can only be added at classful boundary but the updates will be VLSM. It will send updates out every interface matched in the class.

What affect does RIP auto summary have on discontigious networks? How to fix?

Imagine Router b connected to router a and c. Both a and c have network from 10.0.0.0 major but b only has 172.16.1.0. A and C would summarize both networks to B. Problem is when data starts to flow between networks you would end up with B would have two equal costs routes. Add 10.0.0.0 as subinterface along path so auto summary doesn't happen or disable auto summary.

Is RIP manual summarization applied in routing process or interface level? Can you do supernetting? And does it create a discard route?

Interface level.




Cannot do supernetting past the classful network




Doesn't create a discard route.




interface f0/0


ip rip summarization 155.1.0.0 255.255.240.0

RIP send multicast by default. Disable RIP messages on an interface. Configure all interfaces to stop sending RIP messages

Router Rip


passive-interface f0/0




Router Rip


passive-interface default

Configure rip to send unicast messages to neigbor

Must configure passive-interface




Router rip


passive-interface default


neighbor x.x.x.x

Configure RIP to send v2 broadcast.

int f0/0


ip rip v2-broadcast

Configure RIP to send and recieve different versions from what it is receiving.

interface serial 0/0


ip rip send version x


ip rip receive version x

What authentication methods does RIPv2 support?

Clear Text and MD5

What is RIP Source Validation?

RIP will verify that the sender of the packet is on the same subnet. WIth unnumbered interfaces or PPP links must disable source validation.




router rip


no validate-update-source

What is the method to add interpacket delay between RIP updates?

RIP output delay




rouer rip


output-delay 10

What are the two primary differences in configuration of RIPv2 and RIPng?

Interfaces are added to RIP process and not networks. The RIP process has a name.




ipv6 router rip [NAME]




interface g0/0


ipv6 rip [NAME] enable

What is different about how RIPng process updates when compared to RIPv2?

It adds metric when route comes in as opposed to when route leaves. So typically a route shows as 1 when advertised from directly connected neighbor. Now the route will show 2.

Describe RIPng purpose and packet.

It is for routing IPv6. FF02::9, UDP port 521.

What does RIPng use for next-hop?

Use link local for next-hop address.

Does RIPng support authentication?

No, it must be configured in IPv6.

What about disabling split horizon in RIPng? What about route poisoning for split horizon.

It can but only for the entire process. Route poising with split horizon is supported.




ipv6 router rip CCIE RIP


no ip split-horizon


no poison-reverse

Does RIPng support passive interfaces? Why not?

No, because RIP is applied to the interface.

What does this command do?




int g0/0


ip rip triggered

Enables the on demand feature.