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Chapters 1 – 5: Routing and EIGRP Exam Answers
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CCNP ENARSI v8 Chapters 1 – 5: Routing and EIGRP Test Online
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Question 1 of 44
1. Question
1 pointsRefer to the exhibit. What address should be configured on PC1 as its default gateway so that PC1 can communicate with File_server1?Correct
Incorrect
Hint
The default gateway is the IP address of the local router that is used by a host to route packets off the local network segment. The Ethernet interface that connects PC1 to R1 is the interface that PC1 will use as its default gateway. The IP address of this interface is 172.16.0.1. -
Question 2 of 44
2. Question
1 pointsWhat would be the interface ID of an IPv6 enabled interface with a MAC address of 1C-6F-65-C2-BD-F8 when the interface ID is generated by using the EUI-64 process?Correct
Incorrect
Hint
To derive the EUI-64 interface ID by using the MAC address 1C-6F-65-C2-BD-F8, three steps are taken.- Change the seventh bit of the MAC address from a binary 0 to a binary 1 which changes the hex C, into a hex E.
- Insert hex digits FFFE into the middle of the address.
- Rewrite the address in IPv6 format.
-
Question 3 of 44
3. Question
1 pointsA company uses the method SLAAC to configure IPv6 addresses for the workstations of the employees. A network administrator configured the IPv6 address on the LAN interface of the router. The interface status is UP. However, the workstations on the LAN segment did not obtain the correct prefix and prefix length. What else should be configured on the router that is attached to the LAN segment for the workstations to obtain the information?Correct
Incorrect
Hint
A PC that is configured to use the SLAAC method obtains the IPv6 prefix and prefix length from a router. When the PC boots, it sends an RS message to inform the routers that it needs the information. A router sends an RA message that includes the required information. For a router to be able to send RA messages, it must be enabled as an IPv6 router by the unicast ipv6-routing command in global configuration mode. The other options are not used to enable IPv6 routing on a router. -
Question 4 of 44
4. Question
1 pointsWhat does a router use to determine which route from those installed in the routing table is chosen to forward packets?Correct
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Hint
The route chosen for forwarding a packet is the route with the longest prefix length matching the destination network of the packet. The metric and administrative distance are used to determine which routes will make it into the routing table. -
Question 5 of 44
5. Question
1 pointsA computer has to send a packet to a destination host in the same LAN. How will the packet be sent?Correct
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Hint
If the destination host is in the same LAN as the source host, there is no need for a default gateway. A default gateway is needed if a packet needs to be sent outside the LAN. -
Question 6 of 44
6. Question
1 pointsMatch the types of EIGRP routes to the correct default administrative distances. (Not all options are used.)Correct
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Hint
EIGRP uses different administrative distances for each type of source for the routing information. The default values used for summary, internal, and external routes are respectively 5, 90, and 170. -
Question 7 of 44
7. Question
1 pointsWhich two statements accurately describe EIGRP tables? (Choose two.)Correct
Incorrect
Hint
Each EIGRP router maintains a topology table for each routed protocol configured, such as IPv4 and IPv6. The topology table includes route entries for every destination that the router learns from its directly connected EIGRP neighbors. It lists all successors and feasible successors that DUAL has calculated to destination networks. Only the successor is installed into the IP routing table. It also indicates the state of a route; P indicates a route is in passive state, which is in a stable mode. -
Question 8 of 44
8. Question
1 pointsRefer 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?Correct
Incorrect
Hint
A feasible successor route is a backup route to the primary successor route, displayed as the second subentry in the command output. The reported distance of the feasible successor route for the 172.16.99.0 network is 2816. -
Question 9 of 44
9. Question
1 pointsWhich two statements accurately describe an EIGRP successor route? (Choose two.)Correct
Incorrect
Hint
The successor route is the route with the lowest path metric to reach a destination. A feasible successor route is a route that satisfies the feasibility condition and is maintained as a backup route. The successor route is displayed on the topology table with a “P” (passive) code, meaning the topology is stable. -
Question 10 of 44
10. Question
1 pointsWhat two statements describe EIGRP authentication? (Choose two.)Correct
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Hint
EIGRP message authentication ensures that routers only accept routing messages from other connected routers that know the same pre-shared key. EIGRP supports routing protocol authentication using MD5. -
Question 11 of 44
11. Question
1 pointsWhat is an EIGRP successor for a destination network?Correct
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Hint
The successor is the first next-hop router for the successor route (primary route). A successor route is a route with the lowest-metric path to reach a destination network (feasible distance). -
Question 12 of 44
12. Question
1 pointsWhat two values must match between two EIGRP directly connected neighbors to establish and maintain an adjacency? (Choose two.)Correct
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Hint
Before two EIGRP routers can become neighbors, several parameters contained in the exchanged hello packets between the two routers must match. The two routers must use the same EIGRP metric parameters (such as bandwidth and delay) and they both must be configured for the same autonomous system number. -
Question 13 of 44
13. Question
1 pointsWhen would the network administrator use the ip bandwidth-percent eigrp as-number percent command?Correct
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Hint
By default, EIGRP will use only up to 50 percent of an interface’s bandwidth for EIGRP information. This prevents the EIGRP process from over-utilizing a link and not allowing enough bandwidth for the routing of normal traffic. However, if a connection is in low bandwidth, the up to 50 percent bandwidth may not be able to keep up the EIGRP information exchange. The ip bandwidth-percent eigrp command can be used to configure the percentage of bandwidth that may be used by EIGRP on an interface in such a scenario. -
Question 14 of 44
14. Question
1 pointsWhen an EIGRP router detects a topology change, how does the router notify neighbor routers that a new route calculation is required for a specific route?Correct
Incorrect
Hint
An EIGRP update packet is sent out with the topology change notification flag set. If a feasible successor is not available for a route, DUAL performs a new route calculation. The route state changes from passive to active in the EIGRP topology table. The router detecting the topology change sends out query packets to EIGRP neighbors for the route. A query packet includes the network prefix with the delay set to infinity so that other routers are aware that it is now active. -
Question 15 of 44
15. Question
1 pointsWhich command would limit the amount of bandwidth used by EIGRP for protocol control traffic to approximately 128 kbps on a 1.544 Mbps link?Correct
Incorrect
Hint
Some routing protocols can consume all the bandwidth on slow circuits. EIGRP overcomes this deficiency by setting the maximum available bandwidth for all circuits to 50%. This allows EIGRP to use 50% of the bandwidth and reserves 50% of the bandwidth for data packets. To change this default setting, the ip bandwidth-percent eigrp command is used. The ip bandwidth-percent eigrp 100 8command will set the bandwidth for autonomous system 100 at 8% of the bandwidth of the interface. -
Question 16 of 44
16. Question
1 pointsWhich action does split horizon use to reduce incorrect routing information?Correct
Incorrect
Hint
Advertising a route back to the originating router is known as reverse route. Reverse routes waste network resources, causing routing loops. Split horizon prevents the advertisement of reverse routes. -
Question 17 of 44
17. Question
1 pointsRefer to the exhibit. The routing table on R2 does not include all networks that are attached to R1. The network administrator verifies that the network statement is configured to include these two networks. What is a possible cause of the issue?Correct
Incorrect
Hint
The fact that R2 has a route to 172.18.100.0 from R1 indicates that EIGRP is functioning, which excludes the issue of an AS number not matching. The issue is that both sides have a network within the Class B 172.16.0.0/16 network. Therefore, automatic network summarization must be disabled by the no auto-summary command. If this command is not used, the network statement with a wild card mask will not have effect. The passive interface, if configured, will prevent EIGRP updates from entering the two networks, but not prevent R1 from advertising them to R2. -
Question 18 of 44
18. Question
1 pointsWhat two actions will the EIGRP DUAL take if a link to a network goes down? (Choose two.)Correct
Incorrect
Hint
When EIGRP detects that it has lost a successor for a path, it searches for a feasible successor in the topology table. If a feasible successor is not available for this path, DUAL performs a new route calculation. The route state changes from passive to active in the EIGRP topology table. The router detecting the topology change sends out query packets to EIGRP neighbors for the route. -
Question 19 of 44
19. Question
1 pointsRefer to the exhibit. Which two routes will be advertised to the router ISP if autosummarization is disabled? (Choose two.)Correct
Incorrect
Hint
If the no auto-summary command was issued disabling the autosummarization, all subnetworks will be advertised, without summarization. -
Question 20 of 44
20. Question
1 pointsTwo routers, R1 and R2, have established an EIGRP neighbor relationship, but there is still a connectivity problem. Which issue could be causing this problem?Correct
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Hint
If the EIGRP neighbor relationship is formed between the two routers, but there is still a connection issue, there may be a routing problem, incorrectly configured passive interfaces, or an access list that is blocking advertisements of remote networks. -
Question 21 of 44
21. Question
1 pointsRefer 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?Correct
Incorrect
Hint
When enabling EIGRP, the network command must be applied to the classful network address of the interface or to a subnet with the appropriate wildcard mask. The network 172.20.0.0 will only activate interfaces in that network. The wildcard mask 0.1.255.255 must be issued to support both 172.20.0.0 and 172.21.0.0 in a single network statement. -
Question 22 of 44
22. Question
1 pointsRefer to the exhibit. A network administrator has issued the displayed commands. The EIGRP routing domain has completely converged and a network administrator is planning to configure EIGRP authentication throughout the complete network. On which two interfaces should EIGRP authentication be configured between R2 and R3? (Choose two.)Correct
Incorrect
Hint
EIGRP authentication should be configured on each interface that is part of the EIGRP routing domain. According to the output of the issued command show ip eigrp neighbors , EIGRP has formed neighbor relationships with router R2 and router R1. Any interface that is used between router R3 and those two routers should have EIGRP authentication configured on it. -
Question 23 of 44
23. Question
1 pointsRefer 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?Correct
Incorrect
Hint
In EIGRP configuration, the command that starts the EIGRP process is followed by a number that is the autonomous system (AS) number, router eigrp as-number . The as-number must be the same in all routers that are in the same EIGRP routing domain. In this case R2 is configured with AS 80 and R1 is configured with AS 50. -
Question 24 of 44
24. Question
1 pointsRefer to the exhibit. Considering that R2, R3, and R4 are correctly configured, why did R1 not establish an adjacency with R2, R3, and R4?Correct
Incorrect
Hint
The missing routes are the result of there not being an EIGRP adjacency between R1 and R2, R3, and R4.To establish adjacency, a router must send and receive hello packets over an interface to and from its neighbors. The interface Fa0/ of the router R1 is declared as passive, so R1 will not send hello packets over its interface Fa0/0. -
Question 25 of 44
25. Question
1 pointsWhich two protocols are allowed to be routed by EIGRP as a consequence of the PDM feature? (Choose two.)Correct
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Hint
Protocol-dependent modules (PDM) allow EIGRP to route for various Layer 3 protocol packets. TCP and UDP are Layer 4 protocols and RTP is used by EIGRP to guarantee delivery of packets. -
Question 26 of 44
26. Question
1 pointsAn administrator needs to verify if EIGRP has been configured correctly on a router. Which command can be used to display specific routes to verify if they were learned using EIGRPv6?Correct
Incorrect
Hint
The show ipv6 route command displays the entire IPv6 routing table. The use of the additional arguments ipv6 address/prefix-length displays only the routes matching the argument specifics, eg. show ipv6 route 2001:DB8:0:1::/64 . Part of the output from this command specifies details about how the route was learned, for example, known via “eigrp 100”, distance 90, metric 3072, type internal. -
Question 27 of 44
27. Question
1 pointsWhich multicast address is used by the EIGRPv6 process to form neighbor adjacencies?Correct
Incorrect
Hint
FF02::A is an IPv6 link-local scope multicast address that is used by all devices on a wire that want to communicate in the EIGRP protocol with one another. -
Question 28 of 44
28. Question
1 pointsAn administrator is troubleshooting connectivity between two routers configured with EIGRPv6. The routing table, for both the respective routers, displays all the advertised networks and the authentication parameters for key ID and the key string match. Unfortunately, authentication fails between the two routers. What is a possible cause?Correct
Incorrect
Hint
For successful authentication, the key ID and key string must match. Timers do not have to match. However, if they are not configured appropriately, neighbor relationships might flap resulting in unsuccessful authentication. -
Question 29 of 44
29. Question
1 pointsAn administrator is troubleshooting a router in a mixed EIGRPv4 and EIGRPv6 network. Which command can be used to see if the split horizon rule has been applied to an interface for the IPv6 address family?Correct
Incorrect
Hint
The show eigrp address-family ipv6 interfaces detail command will display additional interface parameters (for example, hello interval and hold time, whether split horizon is enabled, whether authentication is set, and statistics about hellos and packets). -
Question 30 of 44
30. Question
1 pointsWhat operational feature is different for EIGRP for IPv6 compared to EIGRP for IPv4?Correct
Incorrect
Hint
Most of the EIGRP operational features are the same for IPv6 as they are for IPv4. Both use the same DUAL algorithm calculations, metric values, neighbor discovery mechanisms, and 32-bit router ID. What is not the same between the protocols are the source and destination addresses used for EIGRP messages. -
Question 31 of 44
31. Question
1 pointsRefer to the exhibit. A network administrator is configuring a router for DHCPv6 operation. Which conclusion can be drawn based on the commands?Correct
Incorrect
Hint
The DHCPv6 is for the stateless DHCPv6 operation that is indicated by changing the O flag to 1 and leaving the M flag as default, which is 0. Therefore, it is not configured for stateful DHCPv6 operation. Although the DNS server has the interface ID 0010, clients in stateless DHCPv6 operation will configure their interface IDs either by EUI-64 or a random number. The ACAD_CLASS is the name of the DHCP pool, not the DHCP server name. -
Question 32 of 44
32. Question
1 pointsWhich ICMPv6 message type contains network configuration information for clients that are performing SLAAC?Correct
Incorrect
Hint
When performing SLAAC, IPv6 clients receive network configuration information from router advertisement messages that are sent by a local router. -
Question 33 of 44
33. Question
1 pointsRefer to the exhibit. Which set of commands will configure static routes that will allow the Park and the Alta routers to a) forward packets to each LAN and b) direct all other traffic to the Internet?Correct
Incorrect
Hint
The LAN connected to the router Park is a stub network, therefore, a default route should be used to forward network traffic destined to non-local networks. The router Alta connects to both the internet and the Park router, it would require two static routes configured, one toward the internet and the other toward the LAN connected to the router Park. -
Question 34 of 44
34. Question
1 pointsA network administrator wants to verify the default delay values for the interfaces on an EIGRP-enabled router. Which command will display these values?Correct
Incorrect
Hint
The show interfaces command is used to show the delay, in microseconds, of a specified interface. This command will also provide the default delay value or an administratively configured value. The show running-config command will only display an administratively configured value. The commands show ip route and show ip protocols will not provide the delay value of each interface. -
Question 35 of 44
35. Question
1 pointsRefer to the exhibit. Router R1 has recently been configured to operate in an IPv6 only network and is connected via interface Gigabit Ethernet 0/0 to router R2. R2 is configured correctly, but will not form a neighbor relationship with R1 What is the problem?Correct
Incorrect
Hint
To successfully implement EIGRPv6 on a Cisco router, the administrator must provide a router ID within the EIGRPv6 router configuration mode. EIGRPv6 will fail to form a neighbor relationship until the router ID is provided. Being an IPv6 only network indicates that there are no configured IPv4 addresses on the router to provide a router ID. The fact that the command ipv6 eigrp 20 was successfully entered into the R1 configuration indicates that the command ipv6 unicast-routing has been entered (otherwise, the ipv6 eigrp 20 command would be rejected). -
Question 36 of 44
36. Question
1 pointsWhich address will EIGRP for IPv6 use as the router ID?Correct
Incorrect
Hint
EIGRP for IPv6 uses the same router ID as EIGRP for IPv4 uses. The 32-bit number can be configured with therouter-id
command or automatically assigned from the highest IPv4 address on an enabled interface. -
Question 37 of 44
37. Question
1 pointsAn administrator is troubleshooting two routers in an EIGRPv6 network. A route filter was applied on one of the routers and since then, routes are no longer being populated as expected. What two commands can be used to verify that the filter was applied correctly and to display the IPv6 prefix list? (Choose two.)Correct
Incorrect
Hint
Theshow run | section ipv6 router eigrp
command is used to verify that the filter has been applied correctly and theshow ipv6 prefix-list
command is used to view the routes listed in the prefix list. -
Question 38 of 44
38. Question
1 pointsRefer to the exhibit. An administrator is attempting to install an IPv6 static route on router R1 to reach the network attached to router R2. After the static route command is entered, connectivity to the network is still failing. What error has been made in the static route configuration?Correct
Incorrect
Hint
In this example the interface in the static route is incorrect. The interface should be the exit interface on R1, which is s0/0/0. -
Question 39 of 44
39. Question
1 pointsRefer to the exhibit. Router CiscoVille has been partially configured for EIGRP authentication. What is missing that would allow successful authentication between EIGRP neighbors?Correct
Incorrect
Hint
The ip authentication key-chain eigrp 1 EIGRP_key command for EIGRP authentication has not been applied on each interface that participates in EIGRP authentication. EIGRP authentication steps include the creation of a keychain, a key ID, and a key string that is the equivalent of a password. EIGRP authentication is utilized on interfaces by selecting the interface to configure and then enabling MD5 authentication. Finally, EIGRP authentication is activated when the keychain to be used is issued on the interface. -
Question 40 of 44
40. Question
1 pointsWhich configuration is necessary to ensure successful operation of EIGRP for IPv6?Correct
Incorrect
Hint
By default, the EIGRP for IPv6 process is in a shutdown state. The EIGRP for IPv6 process must be activated by using the no shutdown command within router configuration mode. -
Question 41 of 44
41. Question
1 pointsWhich destination address is used by EIGRP for IPv6 messages?Correct
Incorrect
-
Question 42 of 44
42. Question
1 pointsWhich two statements describe characteristics of EIGRPV6? (Choose two.)Correct
Incorrect
-
Question 43 of 44
43. Question
1 pointsRefer to the exhibit. EIGRP has been configured on all routers in the network. An EIGRP summary route is configured on the HQ router. How will packets destined for the 192.168.0.10/24 network be handled by router HQ?Correct
Incorrect
Hint
EIGRP for IPv6 uses the all-EIGRP-routers link-local multicast address as the destination address for EIGRP messages. -
Question 44 of 44
44. Question
1 pointsWhen multiple routing protocols have a route to the same destination network, what determines which route is installed in the routing table?Correct
Incorrect
Hint
Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols.