Test Your Knowledge About Routers!

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| By MSalmons
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Quizzes Created: 16 | Total Attempts: 33,227
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  • 1/21 Questions

    Refer to the exhibit. Assuming default settings are configured, which routing protocol has been configured on the router?

    • OSPF
    • RIP
    • EIGRP
    • BGP
    • Static
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About This Quiz

A router is a networking device that forwards data packets between computer networks. The main purpose of a router is to connect multiple networks and forward packets to its own networks or other networks. This quiz has been designed to test your knowledge on routers and networking. So, let's try out this quiz. All the best!

Test Your Knowledge About Routers! - Quiz

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  • 2. 

    Which command or set of commands will stop the RIP routing process?

    • RouterB(config-router)# shutdown

    • RouterB(config)# router rip

    • RouterB(config-router)# network no 192.168.2.0

    • RouterB(config)# no router rip

    • RouterB(config)# router no rip

    Correct Answer
    A. RouterB(config)# no router rip
    Explanation
    The command "RouterB(config)# no router rip" will stop the RIP routing process. This command removes the RIP routing protocol configuration from the router's configuration. By using the "no" keyword followed by "router rip", the router will no longer participate in RIP routing and will stop advertising and receiving RIP updates.

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  • 3. 

    What do distance vector algorithms require each router in the network to send?

    • A partial routing table to each router in the LAN

    • A partial routing table to each router in the WAN

    • The entire routing table to each neighboring router

    • The entire routing table to each router in the autonomous system

    Correct Answer
    A. The entire routing table to each neighboring router
    Explanation
    Distance vector algorithms, such as the Routing Information Protocol (RIP), require each router in the network to send the entire routing table to each neighboring router. This is because distance vector algorithms use the concept of hop count to determine the best path to a destination. By exchanging the entire routing table, routers can calculate the shortest path based on the accumulated hop counts. This allows routers to make informed decisions about the best route to forward packets within the network.

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  • 4. 

    Which of the following methods does split horizon use to reduce incorrect routing information?

    • Routing updates are split in half to reduce the update time.

    • Information learned from one source is not distributed back to that source.

    • New route information must be learned from multiple sources to be accepted.

    • The time between updates is split in half to speed convergence.

    • New route information is suppressed until the system has converged.

    Correct Answer
    A. Information learned from one source is not distributed back to that source.
    Explanation
    Split horizon is a technique used in computer networking to prevent routing loops. It works by not allowing a router to advertise a route back to the same interface from which it was learned. This prevents incorrect routing information from being distributed back to the source and helps maintain a stable and efficient routing table.

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  • 5. 

    Which statements describe RIP? (Choose three.)

    • The maximum metric value is 15 hops.

    • Routing updates occur every 30 seconds.

    • Routing updates occur every 90 seconds.

    • It is a distance vector routing protocol.

    • It is a link state routing protocol.

    Correct Answer(s)
    A. The maximum metric value is 15 hops.
    A. Routing updates occur every 30 seconds.
    A. It is a distance vector routing protocol.
    Explanation
    RIP (Routing Information Protocol) is a distance vector routing protocol used in computer networks. It calculates the best path for data packets based on the number of hops (or routers) they need to traverse. The maximum metric value in RIP is 15 hops, meaning that if a route exceeds this value, it is considered unreachable. Routing updates in RIP occur every 30 seconds, allowing routers to exchange information about network changes. Therefore, the correct statements that describe RIP are: The maximum metric value is 15 hops, Routing updates occur every 30 seconds, and It is a distance vector routing protocol.

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  • 6. 

    Which command will display RIP activity as it occurs on a router?

    • Debug ip rip

    • Show ip route

    • Show ip interface

    • Show ip protocols

    • Debug ip rip config

    Correct Answer
    A. Debug ip rip
    Explanation
    The correct answer is "debug ip rip". This command is used to enable debugging messages for the Routing Information Protocol (RIP) on a router. It allows you to see real-time activity and updates related to RIP on the router, helping with troubleshooting and monitoring the protocol's behavior.

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  • 7. 

    When does a distance vector routing protocol set a hold-down timer on a route?

    • When the metric value of the route decreases

    • When the route is marked as inaccessible

    • When the metric value for the route improves

    • When a regular update is received from a neighboring router

    Correct Answer
    A. When the route is marked as inaccessible
    Explanation
    A distance vector routing protocol sets a hold-down timer on a route when the route is marked as inaccessible. This means that if the protocol determines that a route is no longer reachable, it will mark it as inaccessible and initiate a hold-down timer. During this time, the protocol will not accept any updates or changes regarding that route. This is done to prevent routing loops and ensure stability in the network. Once the hold-down timer expires, the protocol will reassess the route and make necessary adjustments.

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  • 8. 

    When a routing table update is received by a router in a distance vector network, which of the following occurs?

    • The hop count metrics for the enclosed routes are incremented.

    • The update is forwarded to the gateway router for verification.

    • Path entries are checked for routing loops.

    • The hop count metrics for the enclosed routes are decremented.

    • Static routes are updated with the new information.

    Correct Answer
    A. The hop count metrics for the enclosed routes are incremented.
    Explanation
    When a routing table update is received by a router in a distance vector network, the hop count metrics for the enclosed routes are incremented. This means that the router increases the number of hops it takes to reach the destination network for each route in the update. This allows the router to keep track of the distance or cost to each network and make routing decisions based on the shortest path. By incrementing the hop count metrics, the router can prioritize routes with lower hop counts and avoid routing loops.

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  • 9. 

    When does RIP send routing table updates? (Choose two.)

    • Periodically, every 30 seconds

    • Periodically, every 60 seconds

    • Periodically, every 90 seconds

    • If optionally configured, when topology changes occur (triggered-update)

    Correct Answer(s)
    A. Periodically, every 30 seconds
    A. If optionally configured, when topology changes occur (triggered-update)
    Explanation
    RIP sends routing table updates periodically, every 30 seconds. This is the default behavior of RIP and ensures that routing information is regularly exchanged between neighboring routers. Additionally, RIP can also send updates when topology changes occur, such as when a link goes down or a new route is added. This triggered-update feature can be optionally configured to provide more immediate updates in response to network changes.

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  • 10. 

    The following line was displayed in the output of the show IP route command: 192.168.3.0/24 [120/2] via 192.168.2.2, 00:00:30, Serial0/0 What is the administrative distance of the enabled routing protocol?

    • 2

    • 30

    • 100

    • 120

    Correct Answer
    A. 120
    Explanation
    The administrative distance of a routing protocol determines the trustworthiness of the route information received from that protocol. It is used to select the best path when there are multiple routing protocols running on a network device. In this case, the output of the show IP route command displays the administrative distance of the enabled routing protocol as 120, indicated by the [120/2] in the output.

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  • 11. 

    What happens to a static route entry in a routing table when the outgoing interface is not available? *The route is removed from the table. • The router polls neighbours for a replacement route. • The route remains in the table because it was defined as static. • The router redirects the static route to compensate for the loss of the next hop device.

    • The route is removed from the table.

    • The router polls neighbors for a replacement route.

    • The route remains in the table because it was defined as static.

    • The router redirects the static route to compensate for the loss of the next hop device.

    Correct Answer
    A. The route is removed from the table.
    Explanation
    When the outgoing interface is not available, the static route entry is removed from the routing table. This is because a static route is manually configured by the network administrator and does not dynamically adjust to changes in the network. Therefore, if the outgoing interface is not available, the route becomes invalid and is removed from the table to prevent any further attempts to use it for forwarding traffic.

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  • 12. 

    How would an administrator configure a static route for use if a primary route failed?

    • Configure the route with a metric greater than the default value

    • Configure the route and the router will activate it as needed

    • Configure the route to activate by using the redistribute static command

    • Configure the route with an administrative distance greater than the default value

    Correct Answer
    A. Configure the route with an administrative distance greater than the default value
    Explanation
    To configure a static route for use if a primary route fails, the administrator would need to configure the route with an administrative distance greater than the default value. Administrative distance is a value used by routers to determine the trustworthiness of routing information received from different sources. By setting the administrative distance of the static route higher than the default value, the router will prioritize the static route over other routes, including the primary route, in case of a failure. This ensures that the static route will be activated as needed when the primary route is not available.

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  • 13. 

    The graphic shows a network that is configured to use a 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?

    • Split horizon

    • Error condition

    • Hold-down timer

    • Route poisoning

    • Count to infinity

    Correct Answer
    A. Route poisoning
    Explanation
    Route poisoning is a routing loop prevention mechanism in which a router advertises a network with an infinite metric (usually 16) to indicate that the network is unreachable. In this scenario, when Router2 detects that the link to Router1 has gone down, it advertises the network for this link with a hop count metric of 16, effectively poisoning the route. This prevents other routers from using this route and avoids routing loops.

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  • 14. 

    Which of the following functions are performed by a router as routing information travels through the network? (Choose two.)

    • Calculate packet speed

    • Identify invalid networks

    • Advertise supported applications

    • Identify new destinations

    Correct Answer(s)
    A. Identify invalid networks
    A. Identify new destinations
    Explanation
    Routers perform the function of identifying new destinations as routing information travels through the network. This is because routers maintain a routing table that contains information about the available paths to different destinations in the network. They use this information to determine the best path for forwarding packets to their intended destinations. Additionally, routers also identify invalid networks by comparing the destination address of incoming packets with the entries in their routing table. If the destination address does not match any valid network, the router identifies it as an invalid network.

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  • 15. 

    The administrator of the network depicted in the graphic would like to decrease the network's convergence time. How can this be accomplished?

    • Disable split horizon on the routers

    • Increase the update interval on the routers

    • Change the RIP holddown timer to 96 seconds

    • Change the RIP holddown timer to 226 seconds

    Correct Answer
    A. Change the RIP holddown timer to 96 seconds
    Explanation
    By changing the RIP holddown timer to 96 seconds, the network's convergence time can be decreased. The RIP holddown timer is a mechanism used by the Routing Information Protocol (RIP) to prevent routing loops. When a route becomes unreachable, the holddown timer is activated and prevents any new updates about that route for a certain period of time. By reducing the holddown timer to 96 seconds, the network will be able to quickly update and converge on new routes, improving overall network performance.

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  • 16. 

    A router has routes to several subnets of a classful network in its routing table. A default route is defined on the router but the IP classless command is disabled. If the router receives packets for a subnet that is not in its routing table but is in the same classful network as the other subnets, what will happen to the packets?

    • The packets will be forwarded using the default route.

    • The packets will be forwarded using a route to one of the other subnets of the classful network.

    • A nonreachable message will be returned to the source.

    • The packets will be discarded.

    • The router will generate a new route to the subnetted network.

    Correct Answer
    A. The packets will be discarded.
    Explanation
    If the router receives packets for a subnet that is not in its routing table but is in the same classful network as the other subnets, and the IP classless command is disabled, the router will discard the packets. This is because with the IP classless command disabled, the router does not have the capability to look for a more specific route to the subnetted network. As a result, the router cannot forward the packets using the default route or a route to one of the other subnets. Therefore, the packets are simply discarded.

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  • 17. 

    If the passive-interface command is enabled on the fa0/0 interface of Router E, which statements are true? (Choose two.)

    • Router E will send all routing updates via interface fa0/0.

    • Router E will ignore all routing updates learned via interface fa0/0.

    • Router E will use routing updates learned via interface fa0/0.

    • Router E will not send routing updates via interface fa0/0.

    Correct Answer(s)
    A. Router E will use routing updates learned via interface fa0/0.
    A. Router E will not send routing updates via interface fa0/0.
    Explanation
    If the passive-interface command is enabled on the fa0/0 interface of Router E, it means that Router E will not send routing updates via interface fa0/0. However, it will still use routing updates learned via interface fa0/0. This means that Router E will listen and learn from routing updates received on interface fa0/0, but it will not actively participate in sending updates through that interface.

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  • 18. 

    Which statements describe load balancing when RIP is configured as the routing protocol? (Choose two.)

    • A router is allowed to take advantage of multiple best paths to a given destination.

    • RIP uses the round robin approach in load balancing.

    • RIP load balancing selects a single path to forward all data to the destination even though equal parallel paths exist.

    • RIP load balancing is based on bandwidth first and then the hop count.

    • Only one path to a destination can be statically assigned or dynamically calculated.

    Correct Answer(s)
    A. A router is allowed to take advantage of multiple best paths to a given destination.
    A. Only one path to a destination can be statically assigned or dynamically calculated.
    Explanation
    Load balancing in RIP allows a router to take advantage of multiple best paths to a given destination. This means that the router can distribute traffic across these paths, optimizing network performance and preventing congestion. Additionally, only one path to a destination can be statically assigned or dynamically calculated, ensuring that traffic is efficiently routed without unnecessary redundancy. RIP load balancing is not based on the round robin approach or bandwidth and hop count, as stated in the other options.

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  • 19. 

    Which of the following would be the correct command sequence to enable RIP on Router B for all connected networks?

    • RouterB# router rip RouterB(router)# network 210.36.7.0 RouterB(router)# network 220.17.29.0 RouterB(router)# network 211.168.74.0

    • RouterB(config)# router rip RouterB(config-router)# network 198.16.4.0 RouterB(config-router)# network 211.168.74.0 RouterB(config-router)# network 199.84.32.0

    • RouterB(config)# configure router rip RouterB(config-router)# network 210.36.7.0 RouterB(config-router)# network 199.84.32.0 RouterB(config-router)# network 211.168.74.0

    • RouterB(config)# router rip RouterB(config-router)# network 198.16.4.0 RouterB(config-router)# network 210.36.7.0 RouterB(config-router)# network 211.168.74.0

    • RouterB(config-router)# network 198.16.4.0 RouterB(config-router)# network 210.36.7.0 RouterB(config-router)# network 220.17.29.0

    Correct Answer
    A. RouterB(config-router)# network 198.16.4.0 RouterB(config-router)# network 210.36.7.0 RouterB(config-router)# network 220.17.29.0
    Explanation
    The correct command sequence to enable RIP on Router B for all connected networks is to enter the following commands: "RouterB(config-router)# network 198.16.4.0", "RouterB(config-router)# network 210.36.7.0", and "RouterB(config-router)# network 220.17.29.0". This sequence ensures that all three networks are included in the RIP routing process on Router B.

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  • 20. 

    What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)

    • RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.

    • During the next update interval, RouterB will send a RIP update out both ports that includes the inaccessible network.

    • During the next update interval, RouterC will send an update to RouterB stating that network 114.125.16.0 is accessible in 2 hops.

    • Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.

    • RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterC.

    Correct Answer(s)
    A. RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.
    A. Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.
    Explanation
    After RouterA loses connectivity to network 114.125.16.0, RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA. This means that RouterB will inform RouterA about the availability of these networks. Additionally, RouterC will learn about the loss of connectivity to network 114.125.16.0 from RouterB. This means that RouterC will receive an update from RouterB stating that network 114.125.16.0 is no longer accessible.

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  • 21. 

    According to the router output from the show, IP route command shown above, which of the following statements are true? (Choose two.)

    • The metric to network 192.168.8.0 is 24.

    • The hop count to a device on network 192.168.8.0 is 2.

    • The total path cost to network 192.168.4.0 is the default value of 16.

    • The logical address of the next router for network 192.168.1.0 is 192.168.3.1.

    • The devices on network 192.168.5.0 cannot be reached as indicated by the 'C' label.

    Correct Answer(s)
    A. The hop count to a device on network 192.168.8.0 is 2.
    A. The logical address of the next router for network 192.168.1.0 is 192.168.3.1.
    Explanation
    The first statement is true because the metric to network 192.168.8.0 is given as 24 in the router output. The second statement is also true because the hop count to a device on network 192.168.8.0 is given as 2 in the router output.

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  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 27, 2008
    Quiz Created by
    MSalmons

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