2.30 - Implement IPv4 RIP version 2 (RIPv2) Flashcards
What is the administrative distance of RIP?
120
What port does RIPv1 and RIPv2 use to communicate?
UDP/520
What 2 messages does RIP use to get routing updates?
Request and response messages
What metric does RIP use?
Hop Count
How is the metric used to indicate an unreachable network?
16 hops are considered unreachable
How many updates must be missed before a route entry will be marked as unreachable?
6 update periods or 180 seconds.
Why is a random timer associated with scheduled updates?
To prevent table synchronization. Update times are 25.5 and 30 seconds by default
What is the range of this timer for scheduled updates?
-4.5 seconds or 15%
What is the difference between a RIP Request message and a RIP Response message?
A Request message asks a router for an update. A Response message is an update
Which two types of Request messages does RIP use?
Full route table or specific routes only.
Under what circumstances will a RIP response be sent?
A Response is sent when the update timer expires, or upon reception of a Request message.
Why does RIPv1 hide subnets at major network boundaries?
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.
What is the purpose of the garbage collection timer?
It removes unreachables routes from the table upon expiration
What is the default value of the garbage collection timer in RIP?
240 seconds (60 seconds longer than expiration timer)
What is a holddown route?
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
What is the default value of the holddown timer?
180 seconds
What is the command to manipulate the timers in RIP?
router(config-router)#timers basic
What is a RIP triggered update?
When the topology changes a RIP router will send a triggered update
Why is a random timer associated with triggered updates?
Prevents a “storm” of triggered updates from occuring
What is the range of the triggered update timer?
1 to 5 seconds
How do you manipulate the route metrics in RIP?
router(config-router)#offset-list {access-list-number | name} {in | out} offset [type number]
What does the command ip rip triggered do?
It suppresses periodic RIP updates after initial route tables are complete. It only sends updates when the topology changes. Good for low speed links
What does the command ip offset delay do?
Sets an interpacket gap of the indicated delay length to accommodate
processing delays between high-speed and low-speed routers.
Which three fields are new to the RIPv2 message format over RIPv1?
The Route Tag field, the Subnet Mask field, and the Next Hop field.
