Which two eigrp packet types are sent with reliable delivery?

Read Chapter wise CCNA 3 Exam Answers (v5.1 + v6.0)

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

when the routers in an IPv4 network have mismatching EIGRP AS numbers
when the routers in an IPv4 network are connected to discontiguous networks with automatic summarization enabled*
when there is no adjacency that is established between neighboring routers
when there is no common subnet that exists between neighboring routers

2. What is the purpose of a Null0 route in the routing table?

to prevent routing loops*
to redistribute external routes into EIGRP
to act as a gateway of last resort
to prevent the router from sending EIGRP packets

3. 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 EIGRP to send periodic updates.
Enable the serial interfaces of both routers.
Configure the same hello interval between the routers.
Configure both routers with the same EIGRP autonomous system number.*

4. Fill in the blank. Do not use abbreviations.

The _____________ command causes an EIGRP router to stop sending hello packets through an interface.

Correct Answer: passive-interface*

5. 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 network statement used for EIGRP 55 does not enable EIGRP on interface serial 0/1/0.
The hello interval has been altered on serial 0/1/0 and is preventing a neighbor relationship from forming.
The IPv4 address configured on the neighbor that is connected to R1 serial 0/1/0 is incorrect.*
The networks that are configured on serial 0/0/0 and serial 0/1/0 of router R1 are overlapping.
The passive-interface command should have been issued on serial 0/1/0.

6. By default, how many equal-cost routes to the same destination network will EIGRP install in the routing table?

7. 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.
R1 Fa0/0 link local address is wrong.
EIGRP is down on R1.*
R1 Fa0/0 is not configured to send hello packets.
R1 Fa0/0 and R2 Fa0/0 are on different networks.

8. 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 calculated on R3? (Choose two.)

172.16.0.0/16*
172.16.3.0/24
192.168.1.0/30
192.168.10.0/30
192.168.10.0/24*

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

It maximizes the number of routes in the routing table.
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 improves reachability in discontiguous networks.
It increases the size of routing updates.

10. Refer to the exhibit. Which two conclusions can be drawn from the exhibited configuration? (Choose two.)

The configuration supports unequal-cost load balancing.*
The configuration supports equal-cost load balancing.
Any EIGRP-learned route with a metric less than 3 times the successor metric will be installed in the local routing table.*
Any EIGRP-learned route with a metric equal to 3 times the successor metric will be installed in the local routing table.
The network statements require subnet masks to prevent autosummarization.

11. What is the administrative distance of externally learned EIGRP routes?

12. Which routing protocol supports unequal-cost load balancing on Cisco routers?

13. 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*
10.1.0.0/16
10.1.4.0/28
10.1.4.0/30*
10.1.4.0/24

14. Which two steps must be taken in order to send a default route to other EIGRP routers? (Choose two.)

Configure a loopback address.
Configure a default route.*
Configure a router ID.
Ensure automatic summarization is disabled.
Redistribute the default route.*

15. 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 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 GigabitEthernet interfaces are not limiting the flow of EIGRP message information and are being flooded with EIGRP traffic.
The passive-interface command is preventing neighbor relationships on interface GigabitEthernet 0/0.
The GigabitEthernet 0/1 interface is not participating in the EIGRP process.*

16. Refer to the exhibit. An administrator wants EIGRP on Router1 to load balance traffic to network 2001:db8:11:10::/64 across two interfaces. Currently traffic is using only interface GigabitEthernet0/1. A second route, not in the routing table, is available with a metric of 264000. What value is needed in the variance command to make EIGRP put the second route into the routing table?

17. 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 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
because the IPv4 address on Fa0/0 interface of R1 is incorrect
because the automatic summarization is enabled on R1

18. When a Cisco router is configured with fast-switching, how are packets distributed over equal-cost paths?

on a per-packet basis
on a per-interface basis
on a per-path-load basis
on a per-destination basis*

19. What is the default maximum amount of bandwidth that can be used for exchanging EIGRP messages on an EIGRP-configured interface?

20. Fill in the blank. Do not use abbreviations.

The command to propagate the default route from the router Border to the rest of the EIGRP domain is Border(config-router)# _________

Correct Answer: redistribute static*

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

A default route is being learned through an external process.*
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.
Summarization of routes has been manually configured.

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

show ip protocols*
show ip eigrp neighbors
show ip eigrp interfaces
show ip interface brief

23. Assuming that EIGRP is enabled on both routers and automatic summarization is enabled, what must be configured to ensure that R1 will be able to reach the 2.2.2.0/24 network?

Use the command ip address-summary to ensure that R1 recognizes the 2.2.2.0 network.
Use the command no auto-summary to disable automatic summarization.*
EIGRP does not support VLSM and therefore cannot be used with discontiguous networks.
EIGRP supports VLSM and will automatically recognize the 2.2.2.0 network.

24. 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 64 48
ip bandwidth-percent eigrp 75 100
ip bandwidth-percent eigrp 100 75*
ip bandwidth-percent eigrp 100 48
ip bandwidth-percent eigrp 100 64

25. 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 disabled on R3.*
Automatic summarization is enabled on neighboring routers.
Automatic summarization is disabled on a per-interface basis.

26.Which protocol is used by EIGRP to send hello packets?

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

bounded updates
partial updates
EIGRP authentication*
Diffusing Update Algorithm
Reliable Transport Protocol

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

to describe different routing processes
to identify different application layer protocols
to use different transport protocols for different packets
to accommodate routing of different network layer protocols*

29. 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

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

EIGRP uses UDP to send all update packets.
EIGRP sends all update packets via unicast.
EIGRP sends all update packets via multicast.
EIGRP uses a reliable delivery protocol to send all update packets.*

31. 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

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

to lower the router overhead
to send a manual summarization
to exclude some interfaces from the EIGRP process*
to subnet at the time of the configuration

33. 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

34. 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

35. Where are EIGRP successor routes stored?

only in the routing table
only in the neighbor table
in the routing table and the topology table*
in the routing table and the neighbor table

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

the routing table
the neighbor table
the topology table*
the adjacency table

37. How do EIGRP routers establish and maintain neighbor relationships?

by exchanging neighbor tables with directly attached routers
by comparing known routes to information received in updates
by exchanging hello packets with neighboring routers*
by dynamically learning new routes from neighbors
by exchanging routing tables with directly attached routers

38. 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?

bandwidth 1500
shutdown
no shutdown
copy running-config startup-config
reload
no bandwidth*

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

show ip route
show interfaces*
show ip protocols
show ip interface brief

40. 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 *
load
reliability
delay*
MTU

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

42. 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 less than 3523840*

a reported distance greater than 41024000
a feasible distance greater than 41024000
an administrative distance less than 170

43. 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 must be confirmed by neighboring routers before it is put in the active state.
The route is a feasible successor and will be used if the active route fails.
There is no activity on the route to that network.
The route is viable and can be used to forward traffic.*

44. Refer to the exhibit. Which two networks contain feasible successors? (Choose two.)192.168.71.0*

192.168.51.0
10.44.100.252*
10.44.104.253
10.44.101.252

45. 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.

46. Which two EIGRP packet types are sent with unreliable delivery? (Choose two.)

update
query
hello*
reply
acknowledgment*

47. What is identified within the opcode of an EIGRP packet header?

the EIGRP message type that is being sent or received from a neighbor*
the EIGRP autonomous system metrics
the EIGRP hold timer agreed upon with a neighbor
the EIGRP sum of delays from source to destination

48. An administrator issues the router eigrp 100 command on a router. What is the number 100 used for?

as the autonomous system number *
as the number of neighbors supported by this router
as the length of time this router will wait to hear hello packets from a neighbor
as the maximum bandwidth of the fastest interface on the router

49. What information does EIGRP maintain within the routing table?

both successors and feasible successors
only feasible successors
adjacent neighbors
all routes known to the router
only successors*

50. Refer to the exhibit. R3 has two possible paths to the 172.16.99.0 network. What is the reported distance of the feasible successor route?

2340608
2169856
10512128
2816*

51. What is the multicast address used by an EIGRP-enabled router operating with IPv6?

FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
FF02::A*
FF02::B
FF02::1

52. Which configuration is necessary to ensure successful operation of EIGRP for IPv6?

The eigrp router-id command requires an IPv6 address within the router configuration mode.
The network command is required within the router configuration mode.
The no shutdown command is required within the router configuration mode.*
The router eigrp autonomous-system command is required within the router configuration mode.

53. Fill in the Blank. Use the abbreviation.

EIGRP uses the RTP protocol to deliver EIGRP packets to neighbors.

54. Order the precedence in which an EIGRP router would choose the router ID. (Not all options are used.)

Place the options in the following order:
first -> eigrp router-id command
– not scored –
third -> highest IPv4 address on active physical interfaces
second -> highest IPv4 address on loopback interfaces

55. 30. Match the correct version of EIGRP with the EIGRP features. (Not all options are used.)

Place the options in the following order:
– not scored –
EIGRP for IPv4 only -> source address for EIGRP messages is a routable address
both EIGRP for IPv4 and EIGRP for IPv6 -> uses a 32-bit router ID
EIGRP for IPv6 only -> source address for EIGRP messages is a link-local address

56.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?