SEMESTER 2 Chapter 560 points
Routing Information Protocol

V 4.0

5.1.1 / When was the first standard for RIP written? / 1988
5.1.2 / What are the key characteristics of RIP? / RIP is a distance vector routing protocol.
RIP uses hop count as its only metric for path selection.
Advertised routes with hop counts greater than 15 are unreachable.
Messages are broadcast every 30 seconds.
5.1.2.2 / Why was RIP developed with so many fields left as zeros? / Was developed before many other protocols and there for expansion
5.1.3 / What are the two message types in the command field? / Request message and Response message
5.1.3.2 / What information does RIPv1 not send in its updates? / The subnet mask
5.1.4 / What is the default administrative distance for RIP? / 120
What does the default AD mean when you compare RIP and all other protocols? / It is the least-preferred
What are the commands to check the AD? / Show ip protocols
Show ip route
5.2.2 / What command is used to enable a routing protocol? / Router
What command is used to enable RIP as the routing protocol? / Router rip
What is the prompt after you enable the routing protocol? / R1(config-router)#
Is the routing protocol started after you enter the router rip command? / No
What is the command to remove the routing protocol? / No router rip
5.2.3 / What are the two pieces of information that the routing protocol needs to begin operation? / which local interfaces it should use for communication with other routers, as well as which locally connected networks it should advertise to those routers
What command is used to tell the router the directly connected networks? / Network
What is the syntax for the network command? / Router(config-router)#network directly-connected-classful-network-address
What two things does the network command accomplish? / Enables RIP on all interfaces that belong to a specific network. Associated interfaces will now both send and receive RIP updates.
Advertises the specified network in RIP routing updates sent to other routers every 30 seconds.
What happens if you enter a classless subnet in RIPv1? / It will convert it a classful address
5.2.3.2 / What happens if you enter the host address instead of network address in the network command? / The IOS automatically converts it to the network address
5.3.1 / What are the first two commands that should be used to troubleshoot routing? / Show ip route
Show ip protocols
What command will show the routing information as it happens? / Debug ip rip
What should you check before enabling a routing protocol? / See if interfaces are up and up using the show ip interface brief
What command will display the routing table? / Show ip route
For the following questions use this output:
R 192.168.5.0/24 [120/2] via 192.168.2.2, 00:00:23, Serial0/0/0
What does the R mean? / Route learned through RIP
What is 192.168.5.0 / The destination network
What is 120? / The administrative distance
What is the 2? / The hop count
What is 192.168.2.2? / The ip address of the exit interface
What is 00:00:23? / How many seconds have passed since the last update
What is Serial0/0/0? / The exit interface
5.3.2 / What RIP parameters can be confirmed with the show ip protocols command? / RIP routing is configured
The correct interfaces send and receive RIP updates
The router advertises the correct networks
RIP neighbors are sending updates
5.3.3 / What are the three most common problems with RIP configuration? / 1)an incorrect network statement configuration2)a missing network statement configuration3)the configuration of discontiguous subnets in a classful environment.
What command will display RIP routing updates as they are sent and received? / Debug ip rip
What two commands will turn off the debugging process? / No debug ip rip
Undebug all
5.3.4 / What are the ways in which unnecessary routing updates impact a network? / 1. Bandwidth is wasted transporting unnecessary updates. Because RIP updates are broadcast, switches will forward the updates out all ports.
2. All devices on the LAN must process the update up to the Transport layers, where the receiving device will discard the update.
3. Advertising updates on a broadcast network is a security risk. RIP updates can be intercepted with packet sniffing software. Routing updates can be modified and sent back to the router, corrupting the routing table with false metrics that misdirect traffic.
List the command that prevents the transmission of routing updates through a router interface but still allows that network to be advertised to other routers. / Router(config-router)#passive-interface interface-type interface-number
5.4.1.2 / What does RIP do if you enter a classless ip address after the network command? / It translates them into the classful address
What happens if you enter a subnet on the certification exam? / It is considered wrong
5.4.2 / What happens when an update reaches the boundary router? / It is summarized into the classful ip and summarized before forwarding
5.4.3 / What are the two rules that govern RIPv1 updates? / If a routing update and the interface on which it is received belong to the same major network, the subnet mask of the interface is applied to the network in the routing update.
If a routing update and the interface on which it is received belong to different major networks, the classful subnet mask of the network is applied to the network in the routing update.
What subnets are RIPv1 routers limited to? / Same subnet for all subnets on the same classful network
5.4.5 / What are the advantages of automatic summarization? / Smaller routing updates sent and received, which uses less bandwidth for routing updates between R2 and R3.
R3 has a single route for the 172.30.0.0/16 network, regardless of how many subnets there are or how it is subnetted. Using a single route results in a faster lookup process in the routing table for R3.
5.4.5.4-5 / What is the result of auto summarization of routes when the network tries to converge? / The router will not have knowledge of all the possible network.
5.5.1 / What is the command to send all the traffic to the port that goes to the Internet? / Create a static route that will match all the packets and forward them to the Internet
5.5.2 / What command can you enter to specify that this router is to originate default information, by propagating the static default route in RIP updates? / default-information originate
Why would you automatically distribute a default route instead of configuring it manually? / Manually is not scalable