Exam Answers v4.0
1. What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)
o RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.
o During the next update interval, RouterB will send a RIP update out both ports that includes the inaccessible network.
o During the next update interval, RouterC will send an update to RouterB stating that network 114.125.16.0 is accessible in 2 hops.
o Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.
o RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterC.
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o places it immediately in the routing table
o adjusts the metric for the new route to show the added distance for the route**
o advertises this route out all other interfaces except the one that it came in on
o sends a ping packet to verify that the path is a feasible route
3. Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?
o 1
o 2
o 3
o 4
o 5
o 6
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o Routing updates are split in half to reduce the update time.
o Information learned from one source is not distributed back to that source.
o New route information must be learned from multiple sources to be accepted.
o The time between updates is split in half to speed convergence.
o New route information is suppressed until the system has converged.
5. Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?
o The Holddown timer will wait to remove the route from the table for 60 seconds.
o The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.
o The Update timer will request an update for routes that were learned from Router B.
o The Hello timer will expire after 10 seconds and the route will be flushed out of the routing table.
6. The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?
o split horizon
o error condition
o hold-down timer
o route poisoning
o count to infinity
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o EIGRP can be used with Cisco and non-Cisco routers.
o EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.**
o EIGRP has an infinite metric of 16.
o EIGRP sends a partial routing table update, which includes just routes that have been changed.
o EIGRP broadcasts its updates to all routers in the network.
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o an update routing timer expires
o a corrupt update message is received
o a route is installed in the routing table
o the network is converged
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o uses a broadcast to update all other routers in the network every 60 seconds
o uses a multicast address to update other routers every 90 seconds
o will send out an update if there is a failure of a link
o updates only contain information about routes that have changed since last update
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o updates are broadcast only when there are changes to the topology
o updates are broadcast at regular intervals
o broadcast are sent to 0.0.0.0
o broadcasts are sent to 255.255.255.255
o updates contain the entire network topology
o only changes are included in the updates
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o EIGRP uses periodic updates.
o EIGRP only updates affected neighbors.
o EIGRP uses broadcast updates.
o EIGRP updates are partial.
o EIGRP uses the efficient Bellman-Ford algorithm.
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o random jitter
o implementation of classful addressing
o inconsistent routing tables
o a network converging too quickly
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o 0
o 15
o 16
o 224
o 255
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o ensures an invalid route has a metric of 15
o prevents a router from sending any updates after it has introduced a routing loop into the network
o ensures every new route is valid before sending an update
o instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes
15. Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?
o The path will be router A -> router B -> router C -> router E.
o The path will be router A -> router D -> router E
o Router A will load balance between the router A -> router D -> router E and router A -> router B -> router C -> router E path
o Packets will alternate paths depending on the order they arrive at router A.
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o They will share all routes saved in NVRAM prior to the power loss with their directly connected neighbors.
o They will multicast hello packets to all other routers in the network to establish neighbor adjacencie
o They will send updates that include only directly connected routes to their directly connected neighbor
o They will broadcast their full routing table to all routers in the networ
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o a packet bouncing back and forth between two loopback interfaces on a route
o a condition where a return path from a destination is different from the outbound path forming a "loop
o a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destinatio
o the distribution of routes from one routing protocol into anoth
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o It prevents the synchronization of routing updates by buffering the updates as they leave the router interface
o It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update
o It prevents the synchronization of routing updates by causing the router to skip every other scheduled update time
o It prevents the synchronization of routing updates by forcing the router to listen when its time for other updates on the lines before sending it
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o RIPv1**
o EIGR**
o OSP
o IS-I
o RIPv2
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o routing loop
o inconsistent traffic forwarding
o no traffic forwarding until system converge
o inconsistent routing table entrie
o routing table updates sent to wrong destination
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o used to mark routes as unreachable in updates sent to other routers
o prevents regular update messages from reinstating a route that may have gone bad.
o prevents a router from advertising a network through the interface from which the update came.
o limits the time or hops that a packet can traverse through the network before it should be discarded.
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