ccna final exam answers: January 2009

ccna2 final version 4.0 (100%)

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ERouting Final Exam - CCNA Exploration: Routing Protocols and Concepts (Version 4.0)

Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a router? (Choose three.)

***The router modifies the TTL field, decrementing it by one.

The router changes the source IP to the IP of the exit interface.

***The router maintains the same source and destination IP.

***The router changes the source physical address to the physical address of the exit interface.

The router changes the destination IP to the IP of the exit interface.

The router sends the packet out all other interfaces, besides the one it entered the router on.

Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)

***10.0.0.0/8

64.100.0.0/16

128.107.0.0/16

172.16.40.0/24

192.168.1.0/24

***192.168.2.0/24

Which two statements are correct about the split horizon with poison reverse method of routing loop prevention? (Choose two.)

It is enabled by default on all Cisco IOS implementations.

***It assigns a value that represents an infinite metric to the poisoned route.

***It sends back the poisoned route update to the same interface from where it was received.

It instructs routers to hold all changes that might affect routes, for a specified period of time.

It limits the number of hops a packet can traverse through the network before it is discarded.

A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?

A(config)# router rip

A(config-router)# passive-interface S0/0

B(config)# router rip

B(config-router)# network 192.168.25.48

B(config-router)# network 192.168.25.64

A(config)# router rip

A(config-router)# no network 192.168.25.32

***B(config)# router rip

B(config-router)# passive-interface S0/0

A(config)# no router rip

Refer to the exhibit. Which two statements are true based on the exhibited output? (Choose two.)

The administrative distance of EIGRP has been set to 50.

***All routes are stable.

***The show ip eigrp topology command has been run on R1.

The serial interface between the two routers is down.

Each route has one feasible successor.

Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.)

The route to network 172.16.0.0 has an AD of 156160.

Network 192.168.0.16 can best be reached using FastEthernet0/0.

***The AD of EIGRP routes has been manually changed to a value other than the default value.

***Router1 is running both the EIGRP and OSPF routing process.

Network 172.17.0.0 can only be reached using a default route.

***No default route has been configured.

Which two router component and operation pair are correctly described? (Choose two.)

DRAM - loads the bootstrap

RAM - stores the operating system

Flash - executes diagnostics at bootup

***NVRAM - stores the configuration file

ROM - stores the backup configuration file

***POST - runs diagnostics on hardware modules

What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? (Choose two.)

The routers must elect a designated router.

***The routers must agree on the network type.

***The routers must use the same dead interval.

The routers must exchange link state requests.

The routers must exchange database description packets.

What are two functions of a router? (Choose two.)

***It forwards data packets toward their destination.

It forwards the packet to the destination if the TTL value is 0.

It changes the destination IP address of data packets before forwarding them to an exit interface.

It determines the best path based on the destination MAC address.

***It acts as an intersection between multiple IP networks.

Refer to the exhibit. Which statement is true about router R2?

The routing table content indicates that interface S0/0/0 is administratively down.

The route for 172.16.1.0 is a static route.

A packet that is destined for a host on the 172.16.3.0 network is forwarded without performing a routing table lookup.

***The packets that are routed to network 172.16.1.0 require two routing table lookups.

Refer to the exhibit. The output of the show ip route command for router R1 is displayed. What action will the router take for a packet that is destined for 192.168.1.5?

It will drop the packet.

It will forward the packet to interface Serial0/0/0.

It will determine the route for the packet through a routing protocol.

***It will forward the packet to the default gateway.

Refer to the exhibit. Although R2 is configured correctly, host A is unable to access the Internet. Which two static routes can be configured on R1 to enable Internet connectivity for host A? (Choose two.)

ip route 0.0.0.0 0.0.0.0 Fa0/0

***ip route 0.0.0.0 0.0.0.0 Fa0/1

ip route 0.0.0.0 0.0.0.0 10.1.1.1

***ip route 0.0.0.0 0.0.0.0 10.1.1.2

ip route 209.165.202.0 255.255.255.0 10.1.1.1

ip route 209.165.202.0 255.255.255.0 10.1.1.2

Refer to the exhibit. Which two facts can be derived from this output? (Choose two.)

***Three network devices are directly connected to Router2.

***The serial interface between Router2 and Router3 is up.

Router1 and Router3 are directly connected.

Six devices are up and running on the network.

Layer 3 functionality between routers is configured properly.

Refer to the exhibit. Routers R1 and R3 use different routing protocols with default administrative distance values. All devices are properly configured and the destination network is advertised by both protocols.

Which path will be used to transmit the data packets between PC1 and PC2?

***The packets will travel via R2-R1.

The packets will travel via R2-R3.

The traffic will be load-balanced between two paths — via R2-R1 and via R2-R3.

The packets will travel via R2-R3, and the other path via R2-R1 will be retained as the backup path.

A network administrator uses the RIP routing protocol to implement routing within an autonomous system. What are two characteristics of this protocol? (Choose two.)

***It uses the Bellman-Ford algorithm to determine the best path.

It displays an actual map of the network topology.

It offers rapid convergence in large networks.

***It periodically sends complete routing tables to all connected devices.

It is beneficial in complex and hierarchically designed networks.

Refer to the exhibit. What is the meaning of the highlighted value 2?

It is the administrative distance of the routing protocol.

***It is the number of hops between R2 and the 192.168.8.0/24 network.

It is the value used by the DUAL algorithm to determine the bandwidth for the link.

It is the convergence time measured in seconds.

In a lab test environment, a router has learned about network 172.16.1.0 through four different dynamic routing processes. Which route will be used to reach this network?

***D 172.16.1.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Serial0/0/0

O 172.16.1.0/24 [110/1012] via 192.168.200.1, 00:00:22, Serial0/0/0

R 172.16.1.0/24 [120/1] via 192.168.200.1, 00:00:17, Serial0/0/0

I 172.16.1.0/24 [100/1192] via 192.168.200.1, 00:00:09, Serial0/0/0

Refer to the exhibit. The routers are properly configured using a dynamic routing protocol with default settings, and the network is fully converged. Router A is forwarding data to router E. Which statement is true about the routing path?

***If the network uses the RIP protocol, router A will determine that all paths have equal cost.

If the network uses the RIP protocol, router A will update only the A-C-E path in its routing table.

If the network uses the EIGRP routing protocol, router A will determine that path A-D-E has the lowest cost.

If both RIP and EIGRP protocols are configured on router A, the router will use the route information that is learned by the RIP routing protocol.

Which statement is true about the RIPv1 protocol?

It is a link-state routing protocol.

***It excludes subnet information from the routing updates.

It uses the DUAL algorithm to insert backup routes into the topology table.

It uses classless routing as the default method on the router.

Refer to the exhibit. The 10.4.0.0 network fails. What mechanism prevents R2 from receiving false update information regarding the 10.4.0.0 network?

***split horizon

hold-down timers

route poisoning

triggered updates

Refer to the exhibit. All routers are running RIPv1. The two networks 10.1.1.0/29 and 10.1.1.16/29 are unable to access each other. What can be the cause of this problem?

Because RIPv1 is a classless protocol, it does not support this access.

***RIPv1 does not support discontiguous networks.

RIPv1 does not support load balancing.

RIPv1 does not support automatic summarization.

How does route poisoning prevent routing loops?

New routing updates are ignored until the network has converged.

***Failed routes are advertised with a metric of infinity.

A route is marked as unavailable when its Time to Live is exceeded.

The unreachable route is cleared from the routing table after the invalid timer expires.

Which statement is true about the metrics used by routing protocols?

***A metric is a value used by a particular routing protocol to compare paths to remote networks.

A common metric is used by all routing protocols.

The metric with the highest value is installed in the routing table.

The router may use only one parameter at a time to calculate the metric.

Refer to the exhibit. Both routers are using the RIPv2 routing protocol and static routes are undefined. R1 can ping 192.168.2.1 and 10.1.1.2, but is unable to ping 192.168.4.1.

What is the reason for the ping failure?

The serial interface between two routers is down.

R2 is not forwarding the routing updates.

***The 192.168.4.0 network is not included in the RIP configuration of R2.

RIPv1 needs to be configured.

Refer to the exhibit. A network administrator wants to reduce the size of the routing table of R1. Which partial routing table entry in R1 represents the route summary for R2, without including any additional subnets?

10.0.0.0/16 is subnetted, 1 subnets

D 10.5.0.0[90/205891] via 192.168.1.2, S0/0/0

10.0.0.0/24 is subnetted, 4 subnets

D 10.5.0.0[90/205198] via 192.168.1.2, S0/0/0

***10.0.0.0/22 is subnetted, 1 subnets

D 10.5.0.0[90/205901] via 192.168.1.2, S0/0/0

10.0.0.0/8 is subnetted, 4 subnets

D 10.5.0.0[90/205001] via 192.168.1.2, S0/0/0

Refer to the exhibit. An administrator is adding a new subnet of 50 hosts to R3. Which subnet address should be used for the new subnet that provides enough addresses while wasting a minimum of addresses?

192.168.1.0/24

192.168.1.48 /28

192.168.1.32/27

***192.168.1.64/26

Refer to the exhibit. How many routes are ultimate routes?

***5

Refer to the exhibit. Which router is advertising subnet 172.16.1.32/28?

Router1

Router2

Router3

***Router4

Which two statements are true about the EIGRP successor route? (Choose two.)

It is saved in the topology table for use if the primary route fails.

***It may be backed up by a feasible successor route.

***It is used by EIGRP to forward traffic to the destination.

It is flagged as active in the routing table.

After the discovery process has occurred, the successor route is stored in the neighbor table.

Refer to the exhibit. R2 is configured correctly. The network administrator has configured R1 as shown. Which two facts can be deduced from the configuration of R1? (Choose two.)

***R1 will forward the route information for subnet 192.168.100.0/30.

The administrative distance has been set to 50 on R1.

***R1 will not forward route information for subnet 192.168.100.4.0/30.

R1 will forward the EGRP update for subnet 10.10.10.0/30.

Autosummarization must be enabled.

Refer to the exhibit. All routers are running the same routing protocol. Based on the exhibit and its displayed commands, which statement is true?

Routers B, C, and D have no access to the Internet.

***The link to the ISP will be excluded from the routing protocol process.

A default route must be configured on every router.

The wildcard mask is incorrectly configured.

Which two components are used to determine the router ID in the configuration of the OSPF routing process? (Choose two.)

the IP address of the first FastEthernet interface

***the highest IP address of any logical interface

***the highest IP address of any physical interface

the default gateway IP address

the priority value of 1 on any physical interface

Refer to the exhibit. R1 and R2 are unable to establish an adjacency. What two configuration changes will correct the problem? (Choose

two.)

Set a lower priority on R2.

***Configure the routers in the same area.

Set a lower cost on R2 compared to R1.

Add a backup designated router to the network.

***Match the hello and dead timers on both routers.

Refer to the exhibit. All routers are properly configured to use the EIGRP routing protocol with default settings, and the network is fully converged. Which statement correctly describes the path that the traffic will use from the 10.1.1.0/24 network to the 10.1.2.0/24 network?

It will use the A-D path only.

It will use the path A-D, and the paths A-C-D and A-B-D will be retained as the backup paths.

It will use all the paths equally in a round-robin fashion.

***The traffic will be load-balanced between A-B-D and A-C-D.

Which routing protocol maintains a topology table separate from the routing table?

IGRP

RIPv1

RIPv2

***EIGRP

Refer to the exhibit. A ping between the serial interfaces of R1 and R2 is successful, but a ping between their FastEthernet interfaces fails. What is the reason for this problem?

The FastEthernet interface of R1 is disabled.

***One of the default routes is configured incorrectly.

A routing protocol is not configured on both routers.

The default gateway has not been configured on both routers.

Refer to the exhibit. What action will R2 take for a packet that is destined for 192.168.2.0?

It will drop the packet.

It will forward the packet via the S0/0/0 interface.

It will forward the packet via the Fa0/0 interface.

***It will forward the packet to R1.

Refer to the exhibit. A network administrator has configured R1 as shown, and all interfaces are functioning correctly. A ping from R1 to 172.16.1.1 fails. What could be the cause of this problem?

The serial interface on R1 is configured incorrectly.

***The default route is configured incorrectly.

The default-information originate command must be issued on R1.

Autosummarization must be disabled on R1.

Refer to the exhibit. All interfaces are addressed and functioning correctly. The network administrator runs the tracert command on host A. Which two facts could be responsible for the output of this command? (Choose two.)

***The entry for 192.168.2.0/24 is missing from the routing table of R1.

***The entry for 192.168.1.0/24 is missing from the routing table of R2.

The entry for 10.1.1.0/30 is missing from the routing table of R1.

The entry for 10.1.1.0/30 is missing from the routing table of R2.

The entry for 192.168.1.0/24 is missing from the routing table of R1.

The entry for 192.168.2.0/24 is missing from the routing table of R2.

A router has learned two equal cost paths to a remote network via the EIGRP and RIP protocols. Both protocols are using their default configurations. Which path to the remote network will be installed in the routing table?

***the path learned via EIGRP

the path learned via RIP

the path with the highest metric value

both paths with load balancing

Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are displayed. All routers are operational and pings are not blocked on this network.

Which ping will fail?

from R1 to 172.16.1.1

***from R1 to 192.168.3.1

from R2 to 192.168.1.1

from R2 to 192.168.3.1

Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2?

192.168.1.0/24

192.168.0.0/24

***192.168.0.0/22

192.168.1.0/22

Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this?

The IP address of host A is incorrect.

The default gateway of host A is incorrect.

***The Fa0/1 interfaces of the two routers are configured for different subnets.

The subnet mask for the Fa0/0 interface of R1 is incorrect.

Refer to the exhibit. Which two components are required to complete the configuration? (Choose two.)

a CSU/DSU device

***a DTE device

a DCE device

a crossover cable

***a V.35 cable

A router boots and enters setup mode. What is the reason for this?

The IOS image is corrupt.

Cisco IOS is missing from flash memory.

***The configuration file is missing from NVRAM.

The POST process has detected hardware failure.

Refer to the exhibit. A network administrator is accessing router R1 from the console port. Once the administrator is connected to the router, which password should the administrator enter at the R1> prompt to access the privileged EXEC mode?

Cisco001

Cisco123

***Cisco789

Cisco901

Refer to the exhibit. While trying to diagnose a routing problem in the network, the network administrator runs the debug ip rip command. What can be determined from the output of this command?

The router will be unable to ping 192.168.1.2.

The router has two interfaces that participate in the RIP process.

The router will forward the updates for 192.168.1.0 on interface Serial0/0/1.

***The router is not originating routes for 172.16.1.0.

Refer to the exhibit. To implement the RIPv2 protocol, the network administrator runs the commands as displayed. However, the show ip protocol command fails to display any output. How can the administrator solve the problem that is indicated by the lack of output from this command?

Include the default-information originate command.

Include the no auto-summary command.

***Specify the network for which RIP routing has to be enabled.

Implement RIPv2 authentication in the network.

Refer to the exhibit. Router R2 is configured properly and all interfaces are functional. Router R1 has been installed recently. Host A is unable to ping host B.

Which procedure can resolve this problem?

Configure a static route on R1 using the IP address of the serial interface on R1.

Configure a default route on R1 with the exit interface Fa0/0 on R1.

***Configure a static route on R1 using the IP address of S0/0/0 on R2.

Configure a default route on R1 using the IP address of Fa0/0 on R2.

Refer to the exhibit. The show cdp neighbors command was run at R1. Which two facts about the newly detected device can be determined from the output? (Choose two.)

***ABCD is a router that is connected to R1.

ABCD is a non-CISCO device that is connected to R1.

***The device is connected at the Serial0/0/1 interface of R1.

R1 is connected at the S0/0/1 interface of device ABCD.

ABCD does not support switching capability.

Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip database command. However, upon running the show ip route command, the network administrator sees that the router has installed a different route to the 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route?

***Compared to RIP, EIGRP has a lower administrative distance.

Compared to EIGRP, RIP has a higher metric value for the route.

Compared to RIP, the EIGRP route has fewer hops.

Compared to RIP, EIGRP has a faster update timer.

All routers in a network are configured in a single OSPF area with the same priority value. No loopback interface has been set on any of the routers. Which secondary value will the routers use to determine the router ID?

The highest MAC address among the active interfaces of the network will be used.

There will be no router ID until a loopback interface is configured.

The highest IP address among the active FastEthernet interfaces that are running OSPF will be used.

***The highest IP address among the active interfaces will be used.

Refer to the exhibit. Routers R1 and R2 are directly connected via their serial interfaces and are both running the EIGRP routing protocol. R1 and R2 can ping the directly connected serial interface of their neighbor, but they cannot form an EIGRP neighbor adjacency.

What action should be taken to solve this problem?

Enable the serial interfaces of both routers.

Configure EIGRP to send periodic updates.

Configure the same hello interval between the routers.

***Configure both routers with the same EIGRP process ID.

Refer to the exhibit. Two routers are unable to establish an adjacency. What is the possible cause for this?

The two routers are connected on a multiaccess network.

***The hello and dead intervals are different on the two routers.

They have different OSPF router IDs.

They have different process IDs.

What is the function of the OSPF LSR packet?

It is used to confirm the receipt of LSUs.

It is used to establish and maintain adjacency with other OSPF routers.

***It is used by the receiving routers to request more information about any entry in the DBD.

It is used to check the database synchronization between routers.

Refer to the exhibit. The hosts that are connected to R2 are unable to ping the hosts that are connected to R1. How can this problem be resolved?

Configure the router ID on both routers.

***Configure the R2 router interfaces for area 0.

Configure a loopback interface on both routers.

Configure the proper subnet masks on the router interfaces.

Which two statements are true for link-state routing protocols? (Choose two.)

***Routers that run a link-state protocol can establish a complete topology of the network.

Routers in a multipoint network that run a link-state protocol can exchange routing tables.

Routers use only hop count for routing decisions.

***The shortest path first algorithm is used.

Split horizon is used to avoid routing loops.

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CCNA 2 - Module 11 Exam Answers

Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration statement or set of statements was entered for router B to generate the exhibited routing table?

* B(config-router)# network 192.168.1.0 0.0.0.3 area 0
B(config-router)# network 10.16.1.0 0.0.0.224 area 0
B(config-router)# network 10.16.1.0 255.255.255.224 area 0
B(config-router)# network 192.168.1.0 255.255.255.255 area 0
B(config-router)# network 10.0.0.0 255.255.255.255 area 0

Refer to the exhibit. What does the “O*E2″ from the “O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0″ line represent?

* an internal type 2 OSPF route.
an external OSPF route at least two hops away.
an external OSPF route from two different sources.
an external OSPF route that will not increment in cost.
a default route.
The route was distributed into OSPF from a type 2 router.

3. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)

root router
backup root router
domain router
backup domain router
* designated router
* backup designated router

Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?

2
110
* 1786
1.544

5. What does OSPF use to calculate the cost to a destination network?

* bandwidth
bandwidth and hop count
bandwidth and reliability
bandwidth, load, and reliablity

6. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)

* area id
K-values
metric value
* hello interval
* network type
interface type

Refer to the exhibit. All routers have been configured with the interface priorities that are shown. All routers were restarted simultaneously. The results of the DR/BDR election are shown. What can be concluded about this network?

Router C cannot win a DR election under any circumstances.
If the link for interface 192.168.1.4 goes down, router B will become the new DR.
* The highest router ID was most likely determined via an OSPF router-id statement or statements.
If a new router is added with a higher router ID than router D, it will become the DR.

8. A fully converged five router OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router looses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?

All routes for the entire network will be present.
* Routes for connected networks that are operational will be in the routing table.
Because the SPF algorithm has not completed all calculations, no routes will be in the table.
A summary route for all previously learned routes will automatically appear in the routing table until all LSPs have been received by the router.

Refer to the exhibit. What does the “2″ stand for in the router ospf 2 statement?

* The number 2 is the autonomous system number.
The number 2 indicates the number of networks advertised by OSPF.
The number 2 identifies this particular instance of OSPF on this router.
The number 2 indicates the priority of the OSPF process on this router.

10.

Refer to the exhibit. What configuration statements would give the results that are shown in the output of the show ip protocols command?

B(config)# int fa0/0
B(config-if)# router-id 192.168.1.5
B(config)# int lo0
B(config-if)# ip address 192.168.1.5
* B(config)# router ospf 1
B(config-router)# router-id 192.168.1.5
B (config)# router ospf 1
B(config-router)# ip address 192.168.1.5

11.

Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete topology if a DR or BDR were not elected in this OSPF network?

4
5
* 6
7
10

12. What is the default administrative distance for OSPF?

90
100
* 110
115
120

13.

Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relationship is developed between Router1 and Router2?

* A FULL adjacency is formed.
A 2WAY adjacency is formed.
Router2 will become the DR and Router1 will become the BDR.
Both routers will become DROTHERS.

14.

Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing table for the 10.0.0.0/24 network?

2
156
1564
1785
* 1787

15.

Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and OSPF interface priorities. Loopback interfaces are not configured and all interfaces are operational. Router D is the DR and router C is the BDR.
What happens immediately after the following commands are entered on router A?
A(config)# interface fa0/0
A(config-if)# ip ospf priority 255

A will become the DR. D will become the BDR.
A will become the DR. C will remain the BDR.
D will remain the DR. A will become the BDR.
* D will remain the DR. C will remain the BDR.

16. What range of networks will be advertised in the OSPF updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255 area 100?

192.168.0.0/24 through 192.168.0.15/24
* 192.168.0.0/24 through 192.168.15.0/24
192.168.15.0/24 through 192.168.31.0/24
192.168.15.0/24 through 192.168.255.0/24
192.168.16.0/24 through 192.168.255.0/24

17.

Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps must the administrator take to accomplish this?

shut down the loop back interface
use the OSPF router-id 192.168.100.1 command
use the clear ip ospf process command
* nothing, the router-id of Router1 is already 192.168.100.1

18.

Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no configured loopback interfaces, what two roles will router B play on each network segment? (Choose two.)

* DR for network 192.168.1.200
BDR for network 192.168.1.200
DROTHER on 192.168.1.200
DR for network 192.168.1.204
* BDR for network 192.168.1.204
DROTHER on network 192.168.1.204

19.

Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?

any traffic through the router interfaces
routing database updates
* hello packets
BPDU packets

20. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)

Elections are always optional.
Elections are required in all WAN networks.
Elections are required in point-to-point networks.
* Elections are required in broadcast multiaccess networks.
* Elections are required in non-broadcast multiaccess networks.

21.

Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of last resort to the other routers in OSPF area 0?

RouterB(config)# router ospf 10
RouterB(config-router)# gateway-of-last-resort 172.16.6.6
RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0
* RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# default-information originate
RouterB(config)# router ospf 10
RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0
RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# redistribute ip default-route

22.

Refer to the exhibit. RouterA, RouterB, and RouterC in the diagram are running OSPF on their Ethernet interfaces. Router D was just added to the network. Routers are configured with the loopback interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after RouterD is added to the network?

RouterB takes over as DR and RouterD becomes the BDR.
RouterD becomes the BDR and RouterA remains the DR.
RouterD becomes the DR and RouterA becomes the BDR.
RouterC acts as the DR until the election process is complete.
RouterD becomes the DR and RouterB remains the BDR.
* There is no change in the DR or BDR until either current DR or BDR goes down.

23.

Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings to advertise all attached networks. If all of the routers start at the same time, what will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)

* HQ will be DR for 10.4.0.0/16.
Router A will be DR for 10.4.0.0/16.
HQ will be BDR for 10.4.0.0/16.
Router A will be DR for 10.5.0.0/16.
* Remote will be DR for 10.5.0.0/16.
Remote will be BDR for 10.5.0.0/16.

24.

Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor command reveals no neighbors. What is a possible cause?

* OSPF autonomous system IDs do not match.
OSPF process IDs do not match.
OSPF network types are identical.
OSPF hello or dead timers do not match.

25.

Refer to the exhibit. Which network command or set of sommands will cause OSPF to be enabled to send and receive packets for any R1 interface in the exhibited subnets?

R1(config-router)# network 10.0.0.0 0.0.0.0 area 0
* R1(config-router)# network 0.0.0.0 255.255.255.255 area 0
R1(config-router)# network 10.1.0.0 0.0.0.255 area 0
R1(config-router)# network 172.16.1.0 0.0.0.3 area 0
R1(config-router)# network 10.0.0.0 0.0.255.255 area 0
R1(config-router)# network 172.16.0.0 0.255.255.255 area 0

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