CCNA Chapter #7 Quiz

1. Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27 network?

Rip version 2 does not send subnet masks in its updates.

Router A is not setup with RIP as a routing protocol.

Rip version 2 will auto summarize routes by default.

Router B is not setup to advertise the 192.168.1.64/30

RIP version 2 will auto summarize routes by default. This means that when RIP version 2 is used, it will automatically summarize networks at their classful boundaries. In this case, the network 192.168.1.32/27 falls within the range of the classful network 192.168.1.0/24. Therefore, when the routing updates are sent, the network 192.168.1.32/27 is not advertised as a separate route.

Explanation

RIP version 2 will auto summarize routes by default. This means that when RIP version 2 is used, it will automatically summarize networks at their classful boundaries. In this case, the network 192.168.1.32/27 falls within the range of the classful network 192.168.1.0/24. Therefore, when the routing updates are sent, the network 192.168.1.32/27 is not advertised as a separate route.

2. Refer to the exhibit. Routers East and West are configured using RIPv1. Both routers are sending updates about their directly connected routes. The East router can ping the West router serial interface and West can ping the serial interface of East. However, neither router has dynamically learned routes from the other. What is most likely the problem?

A gateway of last resort is required.

Subnetting is not supported by RIPv1.

VLSM is not supported by RIPv1.

One of the routers needs a clock rate on the serial interface.

RIPv1 does not support Variable Length Subnet Masking (VLSM), which means it cannot advertise routes with different subnet masks. In this scenario, both routers are unable to learn routes from each other, indicating that they are unable to exchange routing information due to the lack of VLSM support in RIPv1.

Explanation

RIPv1 does not support Variable Length Subnet Masking (VLSM), which means it cannot advertise routes with different subnet masks. In this scenario, both routers are unable to learn routes from each other, indicating that they are unable to exchange routing information due to the lack of VLSM support in RIPv1.

3. What is the maximum network diameter permitted by the default metric of RIPv2?

15 hops

16 hops

100 hops

120 hops

255 hops

The maximum network diameter permitted by the default metric of RIPv2 is 15 hops. This means that the maximum number of routers that can be traversed in a RIP network before reaching the destination is 15. Beyond this limit, the network is considered unreachable.

Explanation

The maximum network diameter permitted by the default metric of RIPv2 is 15 hops. This means that the maximum number of routers that can be traversed in a RIP network before reaching the destination is 15. Beyond this limit, the network is considered unreachable.

4. A network administrator has been told that the company IP address infrastructure must adhere to RFC 1918. What three IP address ranges from RFC 1918 could the administrator use on the network? (Choose three .)

10.0.0.0/8

127.0.0.0/8

169.254.0.0/16

172.16.0.0/12

192.168.0.0/16

The network administrator could use the IP address ranges 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 on the network. These IP address ranges are defined in RFC 1918 as private IP addresses that can be used within an organization's internal network. The ranges are reserved and not routable on the internet, ensuring that there is no conflict with public IP addresses. Using these IP address ranges allows the company to adhere to the RFC 1918 standard for IP address infrastructure.

Explanation

The network administrator could use the IP address ranges 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 on the network. These IP address ranges are defined in RFC 1918 as private IP addresses that can be used within an organization's internal network. The ranges are reserved and not routable on the internet, ensuring that there is no conflict with public IP addresses. Using these IP address ranges allows the company to adhere to the RFC 1918 standard for IP address infrastructure.

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5. How are RIP v1 and RIP v2 similar to one another? (Choose three.)

They both use hop count as a metric.

They both have the same metric value for infinite distance.

They both broadcast their updates to their neighbors.

They both send subnet mask information in their updates.

They both use split horizon to prevent routing loops.

RIP v1 and RIP v2 are similar in three ways. Firstly, they both use hop count as a metric, meaning that the number of routers a packet must pass through is used to determine the best route. Secondly, they both have the same metric value for infinite distance, which is 16 hops. Lastly, they both use split horizon to prevent routing loops, where a router does not advertise a route back to the same interface from which it was learned.

Explanation

RIP v1 and RIP v2 are similar in three ways. Firstly, they both use hop count as a metric, meaning that the number of routers a packet must pass through is used to determine the best route. Secondly, they both have the same metric value for infinite distance, which is 16 hops. Lastly, they both use split horizon to prevent routing loops, where a router does not advertise a route back to the same interface from which it was learned.

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6. A network administrator installed four new routers that are running RIPv2. Router1 is a boundary router in the RIPv2 network and has a default route configured. Once the network has converged, the network administrator enters Router1(config-router)# defaultinformation originate on Router1. How will this affect the network?

Prevents Router1 from forwarding updates about networks that are not directly connected

Causes all routers in the network to synchronize routing updates with Router1

Forces Router1 to become the primary or designated router (DR) for updates

Propagates the default route to all routers in the network

By entering "default-information originate" command on Router1, the network administrator is configuring Router1 to propagate the default route to all the routers in the network. This means that if any router in the network receives a packet for a destination that it does not have a specific route for, it will forward the packet to Router1. Router1, being the boundary router, will then forward the packet to the appropriate destination based on its default route. This ensures that all routers in the network have a consistent understanding of the default route and can forward packets accordingly.

Explanation

By entering "default-information originate" command on Router1, the network administrator is configuring Router1 to propagate the default route to all the routers in the network. This means that if any router in the network receives a packet for a destination that it does not have a specific route for, it will forward the packet to Router1. Router1, being the boundary router, will then forward the packet to the appropriate destination based on its default route. This ensures that all routers in the network have a consistent understanding of the default route and can forward packets accordingly.

7. Refer to the exhibit. What can be concluded from the output shown in the exhibit?

The routing table is limited to 2 routes.

The LAN interfaces are participating in the routing process.

One update has been sent out of each serial interface and 2 have been received.

The no auto-summary has not been configured on this router.

The output in the exhibit indicates that the router has not been configured with the "no auto-summary" command. This command is used to disable automatic summarization of routes at classful network boundaries. Since this command has not been configured, it can be concluded that the router is using automatic summarization, which can lead to suboptimal routing and potential connectivity issues.

Explanation

The output in the exhibit indicates that the router has not been configured with the "no auto-summary" command. This command is used to disable automatic summarization of routes at classful network boundaries. Since this command has not been configured, it can be concluded that the router is using automatic summarization, which can lead to suboptimal routing and potential connectivity issues.

8. Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20 network?

Router1(config)# ip classless

Router1(config-router)# no passive-interface serial 0/1/1

Router2(config-router)# version 2

Router2(config-router)# neighbor 10.0.0.2

The command "Router2(config-router)# version 2" allows Router1 to learn about the 192.168.0.0/20 network. This command enables the use of RIP version 2, which supports the advertisement of subnet masks. By using version 2, Router2 can include the subnet mask information for the 192.168.0.0/20 network in its RIP updates, allowing Router1 to learn about the network and its associated subnet mask.

Explanation

The command "Router2(config-router)# version 2" allows Router1 to learn about the 192.168.0.0/20 network. This command enables the use of RIP version 2, which supports the advertisement of subnet masks. By using version 2, Router2 can include the subnet mask information for the 192.168.0.0/20 network in its RIP updates, allowing Router1 to learn about the network and its associated subnet mask.

9. Refer to the exhibit. A technician needs to add a new loopback interface to test routing functionality and network design. The technician enters the following set of commands on the router:

Sanford(config)# interface loopback1
Sanford(config-if)# ip address 192.168.6.62 255.255.255.252

Why does the router respond with an error?

The router does not allow loopback interface configurations.

This mask can not be used with this class of addresses.

Classless routing must be configured before this address can be added.

The network address for Loopback1 overlaps with an already configured interface address.

The router is over the limit for the maximum paths that can be provided in the routing table.

The error is occurring because the network address for Loopback1 overlaps with an already configured interface address. This means that the IP address 192.168.6.62 is already assigned to another interface on the router. To resolve this issue, the technician needs to choose a different IP address that does not conflict with any existing addresses on the router.

Explanation

The error is occurring because the network address for Loopback1 overlaps with an already configured interface address. This means that the IP address 192.168.6.62 is already assigned to another interface on the router. To resolve this issue, the technician needs to choose a different IP address that does not conflict with any existing addresses on the router.

10. Refer to the exhibit. RIPv1 is configured as the routing protocol for the network that is shown. The following commands are used on each router: router rip
network 10.0.0.0
network 172.16.0.0

When this configuration is complete, users on the LAN of each router are unable to access the remote LANs. Why?

The network statements are configured incorrectly.

A routing loop has been created.

RIPv1 is unable to route to discontiguous subnets of a major network.

RIPv1 is unable to route networks with a /24 subnet mask.

RIPv1 is a classful routing protocol, meaning it does not support discontiguous subnets within a major network. In the given configuration, the network 172.16.0.0 is a discontiguous subnet of the major network 172.16.0.0/16. Therefore, RIPv1 will not be able to route to these discontiguous subnets, causing users on the LAN of each router to be unable to access the remote LANs.

Explanation

RIPv1 is a classful routing protocol, meaning it does not support discontiguous subnets within a major network. In the given configuration, the network 172.16.0.0 is a discontiguous subnet of the major network 172.16.0.0/16. Therefore, RIPv1 will not be able to route to these discontiguous subnets, causing users on the LAN of each router to be unable to access the remote LANs.

11. What are two reasons to implement RIP version 2 rather than RIP version 1? (Choose two.)

RIP version 2 supports VLSM.

RIP version 2 supports more than 16 routers.

RIP version 2 supports classful (and not classless) routing

RIP version 2 supports routing update authentication.

RIP version 2 supports multi-areas.

RIP version 2 supports VLSM, which allows for more efficient use of IP address space by enabling the use of variable length subnet masks. This means that networks can be divided into smaller subnets, reducing wasted IP addresses. RIP version 2 also supports routing update authentication, which provides a security mechanism to verify the authenticity and integrity of routing updates. This helps prevent unauthorized or malicious routing updates from being accepted and propagated throughout the network.

Explanation

RIP version 2 supports VLSM, which allows for more efficient use of IP address space by enabling the use of variable length subnet masks. This means that networks can be divided into smaller subnets, reducing wasted IP addresses. RIP version 2 also supports routing update authentication, which provides a security mechanism to verify the authenticity and integrity of routing updates. This helps prevent unauthorized or malicious routing updates from being accepted and propagated throughout the network.

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12. Refer to the exhibit. Which command will allow Router2 to learn about the 192.168.16.0/28 network?

Router1(config)# ip classless

Router1(config-router)# network 192.168.16.0

Router1(config-router)# no passive-interface serial 0/1/1

Router2(config-router)# version 2

Router2(config-router)# neighbor 10.0.0.2

The command "Router1(config-router)# network 192.168.16.0" will allow Router2 to learn about the 192.168.16.0/28 network. This command enables the routing process on Router1 to include the specified network in its routing table, allowing it to advertise that network to its neighbors, including Router2.

Explanation

The command "Router1(config-router)# network 192.168.16.0" will allow Router2 to learn about the 192.168.16.0/28 network. This command enables the routing process on Router1 to include the specified network in its routing table, allowing it to advertise that network to its neighbors, including Router2.

13. Refer to the exhibit. All routers are running RIP version 2. JAX is configured to just advertise the 10.0.0.0/24 network. CHI is configured to advertise the 172.16.0.0/16 network. A network administrator enters the commands shown in the exhibit. What changes will occur in this network?

The JAX router will ignore updates for the 172.16.0.0/16 network due to split horizon issues.

The CHI router will install a route to the 192.168.0.0/16 network in its routing table.

The routing table for CHI will have the 192.168.0.0/16 route but it will have an S next to the route.

The ORL router will apply a 255.255.0.0 subnet mask to all networks in the routing updates it forwards.

The CHI router will install a route to the 192.168.0.0/16 network in its routing table. This is because the CHI router is configured to advertise the 172.16.0.0/16 network, and the network administrator entered the command "network 192.168.0.0" on the CHI router. This command tells the router to include the 192.168.0.0/16 network in its routing updates and install it in its routing table.

Explanation

The CHI router will install a route to the 192.168.0.0/16 network in its routing table. This is because the CHI router is configured to advertise the 172.16.0.0/16 network, and the network administrator entered the command "network 192.168.0.0" on the CHI router. This command tells the router to include the 192.168.0.0/16 network in its routing updates and install it in its routing table.

14. Refer to the exhibit. The exhibited network contains a mixture of Cisco and non-Cisco routers. The command debug ip rip was entered on the JAX router. All routers are running the same version of RIP. Router CHI and Router ORL are not able to reach the 192.168.1.16/28 network. What is a possible solution to this problem?

Enable split horizon in the network.

Configure RIPv2 on routers.

Add network 192.168.1.0 to the RIP configuration on the JAX router.Configure JAX Fa0/0 as a passive interface.

Configure JAX Fa0/0 as a passive interface.

Enable the Serial0/0/0 interface on the JAX router.

Enabling RIPv2 on the routers would be a possible solution to the problem. RIPv2 is an updated version of RIP that supports classless routing and can advertise subnet masks along with network addresses. By configuring RIPv2 on all routers, including CHI and ORL, they will be able to properly reach the 192.168.1.16/28 network. This will ensure that the subnet mask information is correctly propagated throughout the network, allowing for proper routing.

Explanation

Enabling RIPv2 on the routers would be a possible solution to the problem. RIPv2 is an updated version of RIP that supports classless routing and can advertise subnet masks along with network addresses. By configuring RIPv2 on all routers, including CHI and ORL, they will be able to properly reach the 192.168.1.16/28 network. This will ensure that the subnet mask information is correctly propagated throughout the network, allowing for proper routing.

15. What field was added to the RIP message header by RFC 1723 to add support for VLSM and CIDR?

Subnet mask

Destination port number

Address family identifier

Source and destination IP addresses

RFC 1723 added the field "subnet mask" to the RIP message header in order to support Variable Length Subnet Masking (VLSM) and Classless Inter-Domain Routing (CIDR). The subnet mask is used to determine the network portion of an IP address, allowing for more efficient allocation of IP addresses and better utilization of network resources. By including the subnet mask in the RIP message header, routers can accurately determine the network boundaries and make routing decisions accordingly.

Explanation

RFC 1723 added the field "subnet mask" to the RIP message header in order to support Variable Length Subnet Masking (VLSM) and Classless Inter-Domain Routing (CIDR). The subnet mask is used to determine the network portion of an IP address, allowing for more efficient allocation of IP addresses and better utilization of network resources. By including the subnet mask in the RIP message header, routers can accurately determine the network boundaries and make routing decisions accordingly.

16. RIPv2 is the configured routing protocol on the routers in a network. The command Router(config-router)# no version 2 is entered on the routers. What effect does entering this command have on routing updates?

Subnet masks will be added to the routing updates.

Routing updates will be sent out using multicast address 224.0.0.9.

Version 1 and 2 updates will be received and the version 2 updates will not be sent.

The RIP routing process will be removed from the router and routing updates will not be forwarded.

Entering the "no version 2" command on the routers will cause the routers to receive both version 1 and version 2 updates, but they will only send out version 1 updates. This means that the routers will still be able to receive routing updates from other routers using both versions, but they will only advertise their own routes using version 1.

Explanation

Entering the "no version 2" command on the routers will cause the routers to receive both version 1 and version 2 updates, but they will only send out version 1 updates. This means that the routers will still be able to receive routing updates from other routers using both versions, but they will only advertise their own routes using version 1.

17. Refer to the exhibit. What effect will the commands that are shown have on RIP updates for Router1?

Only version 2 updates are sent to 255.255.255.255.

Only version 2 updates are sent to 224.0.0.9.

Both version 1 and version 2 updates are sent to 224.0.0.9.

Both version 1 and version 2 updates are sent to 255.255.255.255.

The commands shown in the exhibit will cause Router1 to only send version 2 updates to the multicast address 224.0.0.9.

Explanation

The commands shown in the exhibit will cause Router1 to only send version 2 updates to the multicast address 224.0.0.9.

18. Refer to the exhibit. Which two statements are true? (Choose two.)

Router1 will install a route to 192.168.0.0/20

Router1 will install a route to 192.168.0.0/24

Router1 will install a route to 192.168.16.0/24

Router2 will install a route to 192.168.16.0/24

Router2 will not install a route to 192.168.16.0/20

Router1 will install a route to 192.168.0.0/20 because it has a directly connected network with a subnet mask of /20. Router2 will not install a route to 192.168.16.0/20 because it is not directly connected to that network and there is no specific route for it in the routing table.

Explanation

Router1 will install a route to 192.168.0.0/20 because it has a directly connected network with a subnet mask of /20. Router2 will not install a route to 192.168.16.0/20 because it is not directly connected to that network and there is no specific route for it in the routing table.

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19. Refer to the exhibit. All routers are running RIPv1. What changes will occur in the routing table of router B if a loopback interface with an address of 10.16.1.129/27 is configured on router B?

Routes to the 10.16.1.0/27, 10.16.1.64/27, and 10.16.1.128/27 networks are added.

A connected route to the 10.16.1.128/27 network is added.

A third route to the 10.0.0.0/8 network with RIPv1 as the source is added.

The 10.0.0.0/8 route is dropped immediately from the routing table after router B is configured.

If a loopback interface with an address of 10.16.1.129/27 is configured on router B, a connected route to the 10.16.1.128/27 network will be added to the routing table of router B. This means that router B will have a direct connection to the 10.16.1.128/27 network and will be able to forward traffic to that network without needing to go through any other routers.

Explanation

If a loopback interface with an address of 10.16.1.129/27 is configured on router B, a connected route to the 10.16.1.128/27 network will be added to the routing table of router B. This means that router B will have a direct connection to the 10.16.1.128/27 network and will be able to forward traffic to that network without needing to go through any other routers.

20. What are two functions of the network command used when configuring routing protocols? (Choose two.)

Identifies which networks will be included in the routing updates

Identifies the hosts addresses that can be summarized in the network

Used to list all addresses for remote and local networks

Determines which subnet mask to apply to routing updates

Determines which interfaces can send and receive routing updates

The network command is used to identify which networks will be included in the routing updates. It allows the administrator to specify the network addresses that should be advertised to other routers. Additionally, the network command is used to determine which interfaces can send and receive routing updates. By specifying the network command on specific interfaces, the administrator can control which interfaces participate in the routing process.

Explanation

The network command is used to identify which networks will be included in the routing updates. It allows the administrator to specify the network addresses that should be advertised to other routers. Additionally, the network command is used to determine which interfaces can send and receive routing updates. By specifying the network command on specific interfaces, the administrator can control which interfaces participate in the routing process.

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