RIP Flashcards
Which dynamic routing protocol uses distance for its vector
RIP and RIPv2
What is the default interval for RIP updates
30 seconds
Does RIP support VLSM
Only v2, V1 does not.
What is split horizon
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.
What is a state of convergence
Its when all routers agree on the route information and no additional updates are needed.
What is route poisoning aka poison reverse in RIP
When a router looses a network it will continue to advertise the route but with a hop count of 16.
In RIP how many hops before a router considers the destination to be unreachable
15 is the max number of ‘good’ hops. At 16 the route is considered unreachable.
When RIPv2 sends an update it sends it to what IP address
It sends a multicast to 224.0.0.9
When RIPv1 sends an update it sends it to what IP address
It sends a broadcast to 255.255.255.255
What command is used to configure RIPv2 or for broadcast instead of multicast
ip rip v2-broadcast
What port does RIP use for its update messages
UDP 520
What is the default administrative distance for RIP
120
How can equal cost load sharing be configured in RIP
Create 2 paths to the same network with the same number of hops.
What command allows you to easily test RIPs equal cost load sharing
traceroute
What command is used to disable auto summarization
no auto-summary
What is the command to delete the routes learned though a dynamic routing protocol
#clear ip route * NOTE star can be replace with other variables such as RIP
What is a passive interface in RIP
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.
What is the command to make an interface passive.
#router rip #passive-interface [interface]
How do you make all interfaces passive on a router
#passive-interface default To make an interface not passive afterwords use #no passive-interface [interface]
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
It will use the /25. Routers will always use the most specific or the longest subnet.
What commands can be used to troubleshoot rip messages.
#debug ip rip Its helpful to use #clear ip route * to force RIP to send new updates.
What command is used to configure RIP to use version 2 only
#router rip #version 2
What command is used to enable rip on a network
#router rip #network [network ID]
What administrative distance should be used to create a floating static route to be paired with a RIP dynamic route
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.
What command is used to add a routers default route to its RIP advertisements
default-information originate
What command is used to modify the timers that RIP uses
basic timers [update sec] [invalid] [hold-down better] [flush]
