CCNA 3 R&S Scaling Networks Chapter 8 v5.0 Exam Answers 2014

1 
Which command can be issued on a router to verify that automatic summarization is enabled?

show ip eigrp neighbors

show ip protocols*

show ip interface brief

show ip eigrp interfaces

2 
Which address best summarizes the IPv6 addresses 2001:DB8:ACAD::/48, 2001:DB8:9001::/48, and 2001:DB8:8752::/49?

2001:DB8:8000::/48

2001:DB8:8000::/36

2001:DB8:8000::/47

2001:DB8:8000::/34*

3

Refer to the exhibit. Router R3 is receiving multiple routes through the EIGRP routing protocol. Which statement is true about the implementation of summarization in this network?

Automatic summarization has been enabled only for the 172.21.100.0/24 network.

Automatic summarization is enabled on neighboring routers​.

Automatic summarization is disabled on a per-interface basis.

Automatic summarization is disabled on R3.*

4

Refer to the exhibit. Considering that R2, R3, and R4 are correctly configured, why did R1 not establish an adjacency with R2, R3, and R4?

because the automatic summarization is enabled on R1

because the IPv4 address on Fa0/0 interface of R1 is incorrect

because the Fa0/0 interface of R1 is declared as passive for EIGRP*

because there is no network command for the network 192.168.1.0/24 on R1

5 
In which IOS CLI mode must a network administrator issue the maximum-paths command to configure load balancing in EIGRP?​

router configuration mode*

interface configuration mode

global configuration mode

privileged mode

6 
Two routers, R1 and R2, have established an EIGRP neighbor relationship, but there is still a connectivity problem. Which issue could be causing this problem?​

a process ID mismatch

an authentication mismatch

an access list that is blocking advertisements from other networks*

automatic summarization that is disabled on both routers

7

Refer to the exhibit. Remote users are experiencing connectivity problems when attempting to reach hosts in the 172.21.100.0 /24 network. Using the output in the exhibit, what is the most likely cause of the connectivity problem?

The GigabitEthernet 0/1 interface is not participating in the EIGRP process.*

The hello timer has been modified on interface GigabitEthernet 0/1 of R3 and not on the neighbor, causing a neighbor adjacency not to form.

The passive-interface command is preventing neighbor relationships on interface GigabitEthernet 0/0.

The GigabitEthernet interfaces are not limiting the flow of EIGRP message information and are being flooded with EIGRP traffic.

8 
In which scenario will the use of EIGRP automatic summarization cause inconsistent routing in a network?

when there is no common subnet that exists between neighboring routers

when the routers in an IPv4 network have mismatching EIGRP AS​ numbers

when there is no adjacency that is established between neighboring routers

when the routers in an IPv4 network are connected to discontiguous networks with automatic summarization enabled*

9

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?

Configure the same hello interval between the routers.

Configure EIGRP to send periodic updates.

Enable the serial interfaces of both routers.

Configure both routers with the same EIGRP process ID.*

10

Refer to the exhibit. Which statement accurately reflects the configuration of routing on the HQ router?

The IP address assigned to the GigabitEthernet0/0 interface is 172.16.2.0 255.255.255.0.

A static default route was configured on this router.*

A static default route was learned via EIGRP routing updates.

The static default route should be redistributed using the default-information originate command.​

11

Refer to the exhibit. Which statement is supported by the output?

The route to 192.168.1.1 represents the configuration of a loopback interface.

A static default route has been manually configured on this router.

A default route is being learned through an external process.*

Summarization of routes has been manually configured.

12

Refer to the exhibit. Which two routes will be advertised to the router ISP if autosummarization is disabled? (Choose two.)

10.1.2.0/24*

10.1.4.0/28

10.1.4.0/30*

10.1.4.0/24

10.1.0.0/16

13

Refer to the exhibit. A network administrator has configured EIGRP authentication between routers R1 and R2. After the routing tables are reviewed, it is noted that neither router is receiving EIGRP updates. What is a possible cause for this failure?

The same autonomous system numbers must be used in the interface configurations of each router.*

The key string should be used in interface mode instead of the key chain.

The same number of key strings must be used on each router.

The same key chain name must be used on each router.

The authentication configuration is correct, issue the show ip eigrp neighbors command to troubleshoot the issue.

14 
Two routers, R1 and R2, share a 64 kb/s link. An administrator wants to limit the bandwidth used by EIGRP between these two routers to 48 kb/s. Which command is used on both routers to configure the new bandwidth setting?

ip bandwidth-percent eigrp 100 48

ip bandwidth-percent eigrp 100 75*

ip bandwidth-percent eigrp 75 100

ip bandwidth-percent eigrp 64 48

ip bandwidth-percent eigrp 100 64

15 
Which three statements are advantages of using automatic summarization? (Choose three.)

It decreases the number of entries in the routing table.*

It reduces the frequency of routing updates.*

It ensures that traffic for multiple subnets uses one path through the internetwork.*

It maximizes the number of routes in the routing table.

It improves reachability in discontiguous networks.

It increases the size of routing updates.

16

Refer to the exhibit. After the configuration shown is applied on router R1, the exhibited status message is displayed. Router R1 is unable to form a neighbor relationship with R2 on the serial 0/1/0 interface. What is the most likely cause of this problem?

The passive-interface command should have been issued on serial 0/1/0.

The IPv4 address configured on the neighbor that is connected to R1 serial 0/1/0 is incorrect.*

The hello interval has been altered on serial 0/1/0 and is preventing a neighbor relationship from forming.

The network statement used for EIGRP 55 does not enable EIGRP on interface serial 0/1/0.

The networks that are configured on serial 0/0/0 and serial 0/1/0 of router R1 are overlapping.

17 
What is a characteristic of manual route summarization?

requires high bandwidth utilization for the routing updates

has to be configured globally on the router

reduces total number of routes in routing tables*

cannot include supernet routes​

18 
Fill in the blank. Do not use abbreviations.
The ” passive-interface ” command causes an EIGRP router to stop sending hello packets through an interface.

19

Refer to the exhibit. A network administrator has issued the shown commands. The EIGRP routing domain has completely converged and a network administrator is planning on configuring EIGRP authentication throughout the complete network. On which two interfaces should EIGRP authentication be configured between R2 and R3? (Choose two.)

gig 0/0 of R3

serial 0/1/0 of R4

serial 0/1/0 of R2*

serial 0/0/1 of R2

serial 0/0/1 of R3*

20 
Fill in the blank. Do not use abbreviations.
What is the command that should be issued on a router to verify that EIGRP adjacencies were formed?​

” show ip eigrp neighbor ”

21

Launch PT   Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

R1 and R2 could not establish an EIGRP adjacency. What is the problem?​

EIGRP is down on R2.

EIGRP is down on R1.*

R1 Fa0/0 link local address is wrong.

R1 Fa0/0 and R2 Fa0/0 are on different networks.

R1 Fa0/0 is not configured to send hello packets.

22

Refer to the exhibit. A network administrator has attempted to implement a default route from R1 to the ISP and propagate the default route to EIGRP neighbors. Remote connectivity from the EIGRP neighbor routers to the ISP connected to R1 is failing. Based on the output from the exhibit, what is the most likely cause of the problem?

There are no EIGRP neighbor relationships on R1.

The command default-information originate has not been issued on R1.

The network statement for the ISP connection has not been issued.

The command redistribute static has not been issued on R1.*

The ip route command must specify a next-hop IP address instead of an exit interface when creating a default route.

23

Refer to the exhibit. All networks are active in the same EIGRP routing domain. When the auto-summary command is issued on R3, which two summary networks will be advertised to the neighbors? (Choose two.)

172.16.3.0/24

172.16.0.0/16*

192.168.10.0/24*

192.168.10.0/30

192.168.1.0/30

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CCNA 3 R&S Scaling Networks Chapter 7 v5.0 Exam Answers 2014

1

Place the options in the following order: 
first 
– not scored – 
third 
second

2

Refer to the exhibit. Which command should be used to configure EIGRP to only advertise the network that is attached to the gigabit Ethernet 0/1 interface?

network 172.16.23.64 0.0.0.63*

network 172.16.23.0 255.255.255.192

network 172.16.23.64 0.0.0.127

network 172.16.23.0 255.255.255.128

3 
What is the purpose of using protocol-dependent modules in EIGRP?

to accommodate routing of different network layer protocols*

to identify different application layer protocols

to describe different routing processes

to use different transport protocols for different packets

4 
Which statement describes a characteristic of the delivery of EIGRP update packets?

EIGRP sends all update packets via unicast.

EIGRP uses a reliable delivery protocol to send all update packets.*

EIGRP uses UDP to send all update packets.

EIGRP sends all update packets via multicast.

5 
A new network administrator has been asked to verify the metrics that are used by EIGRP on a Cisco device. Which two EIGRP metrics are measured by using static values on a Cisco device? (Choose two.)

bandwidth*

MTU

delay*

load

reliability

6 
Which protocol is used by EIGRP to send hello packets?

RTP*

TCP

UDP

IP

7 
Which destination MAC address is used when a multicast EIGRP packet is encapsulated into an Ethernet frame?

01-00-5E-00-00-09

01-00-5E-00-00-10

01-00-5E-00-00-0A*

01-00-5E-00-00-0B

8

Place the options in the following order: 
– not scored – 
EIGRP for IPv4 only 
both EIGRP for IPv4 and EIGRP for IPv6 
EIGRP for IPv6 only

9

Refer to the exhibit. R2 has two possible paths to the 192.168.10.4 network. What would make the alternate route meet the feasibility condition?

a reported distance greater than 41024000

a feasible distance greater than 41024000

an administrative distance less than 170

a reported distance less than 3523840*

10

Refer to the exhibit. Which two networks contain feasible successors? (Choose two.)

192.168.51.0

10.44.101.252

10.44.104.253

10.44.100.252*

192.168.71.0*
11 
If all router Ethernet interfaces in an EIGRP network are configured with the default EIGRP timers, how long will a router wait by default to receive an EIGRP packet from its neighbor before declaring the neighbor unreachable?

10 seconds

15 seconds*

20 seconds

30 seconds

12 
Which command or commands must be entered on a serial interface of a Cisco router to restore the bandwidth to the default value of that specific router interface?

shutdown
no shutdown

bandwidth 1500

copy running-config startup-config
reload

no bandwidth*

13 
Which EIGRP route would have the preferred administrative distance?

a summary route*

an internal route

an external route that is redistributed from RIP

an external route that is redistributed from OSPF

14 
How do EIGRP routers establish and maintain neighbor relationships?

by comparing known routes to information received in updates

by exchanging routing tables with directly attached routers

by dynamically learning new routes from neighbors

by exchanging hello packets with neighboring routers*

by exchanging neighbor tables with directly attached routers

15 
When an EIGRP-enabled router uses a password to accept routes from other EIGRP-enabled routers, which mechanism is used?

EIGRP authentication*

Diffusing Update Algorithm

Reliable Transport Protocol

bounded updates

partial updates

16 
What is indicated when an EIGRP route is in the passive state?

The route has the highest path cost of all routes to that destination network.

The route is a feasible successor and will be used if the active route fails.

The route is viable and can be used to forward traffic.*

There is no activity on the route to that network.

The route must be confirmed by neighboring routers before it is put in the active state.

17 
Which three metric weights are set to zero by default when costs in EIGRP are being calculated? (Choose three.)

k6

k3

k5*

k4*

k2*

k1

18 
Why would a network administrator use a wildcard mask in the network command when configuring a router to use EIGRP?

to send a manual summarization

to exclude some interfaces from the EIGRP process*

to subnet at the time of the configuration

to lower the router overhead

19 
Which table is used by EIGRP to store all routes that are learned from EIGRP neighbors?

the adjacency table

the routing table

the topology table*

the neighbor table

20 
Where are EIGRP successor routes stored?

only in the routing table

in the routing table and the topology table*

only in the neighbor table

in the routing table and the neighbor table

21

Launch PT – Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

Which code is displayed on the web server?

Done

Complete*

EIGRP

IPv6EIGRP

22 
Which command is used to display the bandwidth of an interface on an EIGRP-enabled router?

show ip protocols

show interfaces*

show ip interface brief

show ip route

23 
Fill in the blank.
In an EIGRP topology table, a route that is in a/an ” active ” state will cause the Diffusing Update Algorithm to send EIGRP queries that ask other routers for a path to this network.

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CCNA 3 R&S Scaling Networks Chapter 6 v5.0 Exam Answers 2014

1 
The network administrator has been asked to summarize the routes for a new OSPF area. The networks to be summarized are 172.16.8.0, 172.16.10.0, and 172.16.12.0 with subnet masks of 255.255.255.0 for each network. Which command should the administrator use to forward the summary route for area 15 into area 0?

area 15 range 172.16.8.0 255.255.255.248

area 0 range 172.16.8.0 255.255.248.0

area 0 range 172.16.8.0 255.255.255.248

area 15 range 172.16.8.0 255.255.248.0*

2 
Fill in the blank.
The “ backbone ” area interconnects with all other OSPF area types.

3

Place the options in the following order: 
backbone router 
– not scored – 
internal router 
Autonomous System Boundary Router 
Area Border Router

4 
Fill in the blank. Do not use acronyms.
OSPF type 2 LSA messages are only generated by the ”  DR  ” router to advertise routes in multiaccess networks.

5 
What is one advantage of using multiarea OSPF?

It improves the routing efficiency by reducing the routing table and link-state update overhead.*

It enables multiple routing protocols to be running in a large network.

It increases the routing performance by dividing the neighbor table into separate smaller ones.

It allows OSPFv2 and OSPFv3 to be running together.

6 
A network administrator is verifying a multi-area OSPF configuration by checking the routing table on a router in area 1. The administrator notices a route to a network that is connected to a router in area 2. Which code appears in front of this route in the routing table within area 1?

O IA*

O

C

O E2

7

Refer to the exhibit. What can be concluded about network 192.168.4.0 in the R2 routing table?

This network should be used to forward traffic toward external networks.

The network was learned from a router within the same area as R2.*

The network was learned through summary LSAs from an ABR.

The network can be reached through the GigabitEthernet0/0 interface.

8 
An ABR in a multiarea OSPF network receives LSAs from its neighbor that identify the neighbor as an ASBR with learned external networks from the Internet. Which LSA type would the ABR send to other areas to identify the ASBR, so that internal traffic that is destined for the Internet will be sent through the ASBR?

LSA type 1

LSA type 2

LSA type 3

LSA type 4*

LSA type 5

9 
Which three steps in the design and implementation of a multiarea OSPF network are considered planning steps? (Choose three.)

Configure OSPF.

Define the OSPF parameters.*

Troubleshoot the configurations.

Gather the required parameters.*

Define the network requirements.*

Verify OSPF.

10 
Fill in the blank. Use a number.
An ASBR generates type ” 5 ” LSAs for each of its external routes and floods them into the area that it is connected to.

11

Refer to the exhibit. What is indicated by the O IA in the router output?

The route was learned from within the area.

The route was learned from outside the internetwork.

The route was manually configured.

The route was learned from another area.*

12 
Which command can be used to verify the contents of the LSDB in an OSPF area?

show ip route ospf

show ip ospf database*

show ip ospf interface

show ip ospf neighbor

13 
Which statement describes a multiarea OSPF network?

It has a core backbone area with other areas connected to the backbone area.*

It has multiple routers that run multiple routing protocols simultaneously, and each protocol consists of an area.

It consists of multiple network areas that are daisy-chained together.

It requires a three-layer hierarchical network design approach.

14 
Which characteristic describes both ABRs and ASBRs that are implemented in a multiarea OSPF network?

They usually have many local networks attached.

They both run multiple routing protocols simultaneously.

They are required to perform any summarization or redistribution tasks.*

They are required to reload frequently and quickly in order to update the LSDB.

15 
Where can interarea route summarization be performed in an OSPF network?

ABR*

any router

DR

ASBR

16

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

The entry for 172.16.200.1 represents a loopback interface.

To reach network 172.16.2.0, traffic will travel through the GigabitEthernet0/0 interface.

To reach network 192.168.1.0, traffic will exit via the Serial0/0/0 interface​.*

The routing table contains routes from multiple areas.*

The routing table contains two intra-area routes.

17

Launch PT  Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
What is preventing users who are connected to router R2 from accessing resources located either within the network 192.168.1.0 or the internet?

The router R2 is not receiving any updates from either router R1 or R3.*

The default route is not redistributed correctly from the router R1 by OSPF.

The OSPF timers that are configured on routers R1, R2, and R3 are not compatible.

The interface that is connected to the ISP is down.

The OSPF network statements are misconfigured on one of the routers.

18 
Which two statements correctly describe OSPF type 3 LSAs? (Choose two.)

Type 3 LSAs are used to update routes between OSPF areas.*

Type 3 LSAs are known as router link entries​.

Type 3 LSAs are used for routes to networks outside the OSPF autonomous system​.

Type 3 LSAs are known as autonomous system external LSA entries.​

Type 3 LSAs are generated without requiring a full SPF calculation.​*

19 
A network administrator is implementing OSPF in a portion of the network and must ensure that only specific routes are advertised via OSPF. Which network statement would configure the OSPF process for networks 192.168.4.0, 192.168.5.0, 192.168.6.0, and 192.168.7.0, now located in the backbone area, and inject them into the OSPF domain?

r1(config-router)# network 192.168.0.0 0.0.0.255 area 1

r1(config-router)# network 192.168.4.0 0.0.255.255 area 0

r1(config-router)# network 192.168.4.0 0.0.15.255 area 1

r1(config-router)# network 192.168.0.0 0.0.3.255 area 0

r1(config-router)# network 192.168.4.0 0.0.3.255 area 0*

r1(config-router)# network 192.168.4.0 0.0.3.255 area 1

20 
Which two networks are part of the summary route 192.168.32.0/22? (Choose two.)

192.168.35.0/24*

192.168.36.0/24

192.168.33.0/24*

192.168.31.0/24

192.168.37.0/24

192.168.38.0/24

21

Refer to the exhibit. Fill in the blank. Do not use abbreviations.
The “network 192.168.10.128 0.0.0.127 area 1” command must be issued to configure R1 for multiarea OSPF.​

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