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Chapters 6 – 7: Routing Essentials and EIGRP Exam Answers
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CCNP ENCOR v8 Chapters 6 – 7: Routing Essentials and EIGRP Test Online
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Question 1 of 34
1. Question
1 pointsWhich type of routing protocol uses LSAs and TLVs to support extended features?Correct
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Hint
Link-state routing protocols include capabilities such as LSAs for OSPF and TLVs (type/length/value) for IS-IS that allow them to support extended features. -
Question 2 of 34
2. Question
1 pointsWhat are two characteristics of link-state routing protocols? (Choose two.)Correct
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Hint
Link-state protocols like OSPF and ISIS use more CPU and memory resources than distance vector protocols do because they maintain a complete synchronized map of the network and run the SPF algorithm to determine the best path. -
Question 3 of 34
3. Question
1 pointsWhat data is used by OSPF and ISIS for loop prevention?Correct
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Hint
OSPF and ISIS are link-state routing protocols. As link-state routing protocols they have a synchronized and identical map of the network. Using the complete map of the network, every router in the network then runs the Dijkstra shortest path first (SPF) algorithm to calculate the best shortest loop-free paths. -
Question 4 of 34
4. Question
1 pointsWhich routing protocol incorporates characteristics of both distance vector and link-state protocols?Correct
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Hint
As a hybrid routing protocol, EIGRP incorporates the characteristics of both distance vector and link-state protocols. It uses bandwidth and other metrics rather than hop count to determine the best path and this information is advertised to all neighbors. -
Question 5 of 34
5. Question
1 pointsHow do EIGRP routers establish and maintain neighbor relationships?Correct
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Hint
EIGRP uses hello messages to establish and maintain neighbor relationships. -
Question 6 of 34
6. Question
1 pointsA router has installed several routes into the routing table. How will the router determine which route to use 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 appear in the routing table. -
Question 7 of 34
7. Question
1 pointsWhat is the effect of configuring the ipv6 unicast-routing command on a router?Correct
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Hint
When the ipv6 unicast-routing command is implemented on a router, it enables the router as an IPv6 router. Use of this command also assigns the router to the all-routers multicast group. -
Question 8 of 34
8. Question
1 pointsWhy would a floating static route be configured with an administrative distance that is higher than the administrative distance of a dynamic routing protocol that is running on the same router?Correct
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Hint
By default, dynamic routing protocols have a higher administrative distance than static routes. Configuring a static route with a higher administrative distance than that of the dynamic routing protocol will result in the dynamic route being used instead of the static route. However, should the dynamically learned route fail, then the static route will be used as a backup. -
Question 9 of 34
9. Question
1 pointsWhich static route statement shows a recursive IPv6 static route?Correct
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Hint
In a recursive static route, only the next-hop IPv6 address is specified. As a consequence, the router must perform a recursive route table lookup to find an exit interface associated with the network of the IPv6 address. -
Question 10 of 34
10. Question
1 pointsRefer to the exhibit. Which command will properly configure an IPv6 static route on R2 that will allow traffic from PC2 to reach PC1 without any recursive lookups by router R2?
Correct
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Hint
A nonrecursive route must have an exit interface specified from which the destination network can be reached. In this example 2001:db8:10:12::/64 is the destination network and R2 will use exit interface S0/0/0 to reach that network. Therefore, the static route would be ipv6 route 2001:db8:10:12::/64 S0/0/0. -
Question 11 of 34
11. Question
1 pointsRefer to the exhibit. Router R1 has an OSPF neighbor relationship with the ISP router over the 192.168.0.32 network. The 192.168.0.36 network link should serve as a backup when the OSPF link goes down. The floating static route command ip route 0.0.0.0 0.0.0.0 S0/0/1 100 was issued on R1 and now traffic is using the backup link even when the OSPF link is up and functioning. Which change should be made to the static route command so that traffic will only use the OSPF link when it is up?
Correct
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Hint
The problem with the current floating static route is that the administrative distance is set too low. The administrative distance will need to be higher than that of OSPF, which is 110, so that the router will only use the OSPF link when it is up. -
Question 12 of 34
12. Question
1 pointsWhat is used by BGP to guarantee a loop free path to reach a destination?Correct
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Hint
BGP is a path vector protocol which uses several path attributes to determine the best path. To prevent loops BGP updates include a record of each autonomous system that the routing advertisement traversed. A BGP router that receives the update should not see its own AS in the AS Path. If it did, it would indicate a loop. -
Question 13 of 34
13. Question
1 pointsWhat is the purpose for creating VRFs on a router?Correct
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Hint
Virtual routing and forwarding, or VRF, is a technology that creates several separate virtual routers on a single physical router. Each of the virtual routers acts as an independent and separate router so that their paths are isolated from each other. -
Question 14 of 34
14. Question
1 pointsWhich technology creates segmentation between network interfaces, IP addresses, and routing tables?Correct
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Hint
Virtual routing and forwarding, or VRF, is a technology that creates several separate virtual routers on a single physical router. Each of the virtual routers acts as an independent and separate router so that their paths are isolated from each other. -
Question 15 of 34
15. Question
1 pointsRefer to a portion of an EIGRP topology table:P 172.18.3.0/24, 1 successors, __ is 2172416 via 172.18.4.3 (2172416/28160), Serial0/0/1 P 172.18.5.0/24, 1 successors, __ is 2495120 via 172.18.6.3 (2495120/227692), Serial0/1/0 P 192.168.24.0/24, 1 successors, __ is 2684416 via 192.168.13.5 (2684416/2072316), Serial0/0/0 via 172.18.4.3 (2854912/2342912), Serial0/0/1 P 10.34.1.0/24, 1 successors, __ is 3072 via 10.13.1.3 (3072/2937), GigabitEthernet0/1 via 10.14.1.4 (5376/2937), GigabitEthernet0/2
What is the reported distance of the successor route for 172.18.3.0/24?Correct
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Question 16 of 34
16. Question
1 pointsWhat is the administrative distance of a directly connected interface?Correct
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Question 17 of 34
17. Question
1 pointsRefer 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?
Correct
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Hint
To meet the feasibility condition, the reported distance (RD) to a network must be less than the current feasible distance to the same destination network. In this example the current feasible distance is 3523840. This means that to be a feasible successor, a route would need a reported distance less than 3523840. -
Question 18 of 34
18. Question
1 pointsWhich protocol number is used to indicate that an EIGRP packet is encapsulated in an IP packet?Correct
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Hint
In an IP packet header, the field protocol number indicates which protocol is used in the encapsulated PDU. 6 is TCP, 17 is UDP, 88 is EIGRP, and 89 is OSPF. -
Question 19 of 34
19. Question
1 pointsMatch the description to the EIGRP packet type. (Not all options are used.)Correct
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Hint
EIGRP uses five different packet types include:- Hello packets – Used for neighbor discovery and to maintain neighbor adjacencies.
- Update packets – Used to propagate routing information to EIGRP neighbors.
- Acknowledgment packets – Used to acknowledge the receipt of an EIGRP message that was sent using reliable delivery.
- Query packets – Used to query routes from neighbors.
- Reply packets – Sent in response to an EIGRP query.
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Question 20 of 34
20. Question
1 pointsWhich statement describes the autonomous system number used in EIGRP configuration on a Cisco router?Correct
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Hint
The autonomous system number used in the EIGRP configuration is not associated with the Internet Assigned Numbers Authority (IANA) globally assigned autonomous system numbers that are used by external routing protocols. It just functions as a process ID, which is necessary because a router may run multiple instances of EIGRP. Each instance of EIGRP can be configured to support and exchange routing updates for different networks. An organization has the freedom to choose its own AS number in the EIGRP configuration. -
Question 21 of 34
21. Question
1 pointsWhich bandwidth value is used when calculating the EIGRP metric of a route?Correct
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Hint
The bandwidth factor that is used to calculate the composite metric of the EIGRP is defined as the slowest bandwidth of all outgoing interfaces between the source and destination. -
Question 22 of 34
22. Question
1 pointsRefer to the exhibit. All the routers that are displayed are part of the EIGRP domain. Assuming EIGRP metric weights are not altered in the configurations, which path will a packet take that originates from a host on the 192.168.1.0/24 network and is going to a host on the 192.168.2.0/24 network?
Correct
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Hint
EIGRP only uses the slowest bandwidth in its composite metric. The slowest bandwidth in the path R1, R2, R5, R3 is 64 kb/s and thus offers the best path to the 192.168.2.0/24 network. -
Question 23 of 34
23. Question
1 pointsWhich two metric weights are set to one by default when costs in EIGRP are being calculated? (Choose two.)Correct
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Hint
By default, k1 and k3 are set to one and k2, k4, and k5 are set to zero during cost calculation by the EIGRP process. There is no k6 value. -
Question 24 of 34
24. Question
1 pointsWhich routing protocol supports load balancing across links with unequal costs?Correct
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Hint
Routing protocols with two or more paths to a destination network can load balance traffic across multiple paths. EIGRP is the only routing protocol that supports load balancing across unequal cost paths. -
Question 25 of 34
25. Question
1 pointsHow has the EIGRP routing protocol improved by having interface delay measured in picoseconds instead of microseconds?Correct
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Hint
The original values used to calculate EIGRP metrics were in microseconds for delay and kilobytes per second for bandwidth. When using EIGRP wide metrics, the delay units are picoseconds and within the formula, the metric is found by multiplying by 65,535 instead of 256, thus providing support of interface bandwidth up to 655 terabits per second. -
Question 26 of 34
26. Question
1 pointsIf 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?Correct
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Hint
EIGRP uses the hold time as the maximum time it should wait for receiving a hello packet (or other EIGRP packets) from its neighbor before declaring that the neighbor is unreachable. By default the hold time is 3 times greater than the hello interval. On LAN interfaces, the default hello time is 5 seconds and the default hold time is 15 seconds. -
Question 27 of 34
27. Question
1 pointsWhat two conditions will result in an EIGRP route going into the active state? (Choose two.)Correct
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Hint
If a successor is no longer available, and there is no feasible successor, an EIGRP route will be put into the active state while the router actively searches for a new path to the destination. -
Question 28 of 34
28. Question
1 pointsAn EIGRP router loses the route to a network. Its topology table contains two feasible successors to the same network. What action will the router take?Correct
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Hint
Because EIGRP uses the DUAL algorithm, the router is able to maintain information on all potential loop-free backup routes. In the event of the failure of a routing table entry, the router immediately inserts the best backup route into the routing table. -
Question 29 of 34
29. Question
1 pointsWhich feature of the EIGRP routing protocol can provide fast re-convergence without DUAL recomputation in the event of a route failure?Correct
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Hint
EIGRP avoids DUAL recomputation of routes whenever possible by maintaining a list of backup routes (feasible successors) in the topology table already determined to be loop-free. If the primary route (the successor route, which is in the passive state) in the routing table fails, the best backup route is immediately added to the routing table. A route in the active state is in the process of being recomputed by DUAL. -
Question 30 of 34
30. Question
1 pointsWhat are two benefits of applying summarization to networks within a company that uses the EIGRP routing protocol? (Choose two.)Correct
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Hint
When summarization is applied within any routing protocol, the routing tables within the organization are smaller. An added benefit to EIGRP-enabled routers is that when a route goes active during convergence or when a link has gone down and there is no feasible successor, the number of routers that receive query packets is reduced. -
Question 31 of 34
31. Question
1 pointsRefer to a portion of an EIGRP topology table:P 172.18.3.0/24, 1 successors, __ is 2172416 via 172.18.4.3 (2172416/28160), Serial0/0/1 P 172.18.5.0/24, 1 successors, __ is 2495120 via 172.18.6.3 (2495120/227692), Serial0/1/0 P 192.168.24.0/24, 1 successors, __ is 2684416 via 192.168.13.5 (2684416/2072316), Serial0/0/0 via 172.18.4.3 (2854912/2342912), Serial0/0/1 P 10.34.1.0/24, 1 successors, __ is 3072 via 10.13.1.3 (3072/2937), GigabitEthernet0/1 via 10.14.1.4 (5376/2937), GigabitEthernet0/2
What is the metric for the successor route for 10.34.1.0/24?Correct
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Question 32 of 34
32. Question
1 pointsWhat is the administrative distance of a static route?Correct
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Question 33 of 34
33. Question
1 pointsRefer to a portion of an EIGRP topology table:P 172.18.3.0/24, 1 successors, __ is 2172416 via 172.18.4.3 (2172416/28160), Serial0/0/1 P 172.18.5.0/24, 1 successors, __ is 2495120 via 172.18.6.3 (2495120/227692), Serial0/1/0 P 192.168.24.0/24, 1 successors, __ is 2684416 via 192.168.13.5 (2684416/2072316), Serial0/0/0 via 172.18.4.3 (2854912/2342912), Serial0/0/1 P 10.34.1.0/24, 1 successors, __ is 3072 via 10.13.1.3 (3072/2937), GigabitEthernet0/1 via 10.14.1.4 (5376/2937), GigabitEthernet0/2
What is the metric for the feasible successor route for 10.34.1.0/24?Correct
Incorrect
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Question 34 of 34
34. Question
1 pointsWhat is the administrative distance of an EIGRP summary route?Correct
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