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Certifications›300-410›Objectives›EIGRP Troubleshooting
Objective 101.0

EIGRP Troubleshooting

300-410 Practice Questions

Full Practice Test →All Objectives

300-410 EIGRP Troubleshooting — Practice Questions

30 questions from this objective

Question 2mediummultiple choice
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A network engineer is troubleshooting an EIGRP adjacency issue between two directly connected routers, R1 and R2. Both routers are configured with the same autonomous system number, but the adjacency fails to come up. The engineer checks the interfaces and verifies that they are up/up. On R1, the output of 'show ip eigrp neighbors' shows nothing. What is the most likely cause of this problem?

Question 3mediummultiple choice
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A network engineer is troubleshooting a routing issue in an EIGRP network. Router R1 is not learning a specific route from its neighbor R2, even though R2 has the route in its routing table. The engineer checks the EIGRP topology table on R1 and does not see the route. The output of 'show ip eigrp neighbors' shows that R1 and R2 are adjacent. What should the engineer check next?

Question 4hardmultiple choice
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An engineer is troubleshooting an EIGRP convergence issue. After a link failure, the network takes an unusually long time to converge. The engineer notices that the EIGRP hello and hold timers are set to the default values. The network has many routers in a hub-and-spoke topology. What is the most likely cause of the slow convergence?

Question 5hardmultiple choice
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A network engineer is troubleshooting an EIGRP issue where a route is flapping in and out of the routing table. The engineer checks the logs and sees messages indicating that the route is being learned from two different neighbors, but the metric keeps changing. The route is a summary route. What is the most likely cause of the flapping?

Question 6mediummultiple choice
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An engineer is troubleshooting an EIGRP issue where a router is not learning any routes from a neighbor, but the neighbor adjacency is up. The engineer checks the EIGRP topology table on the local router and sees that the neighbor is listed, but no routes from that neighbor are present. The engineer also verifies that the neighbor has routes to advertise. What is the most likely cause?

Question 7mediummultiple choice
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A network engineer is troubleshooting an EIGRP issue where a router is not installing a route in the routing table, even though the route is present in the EIGRP topology table. The route is a feasible successor, but it is not being used. What is the most likely reason for this?

Question 8hardmultiple choice
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An engineer is troubleshooting an EIGRP issue where a router is not forming an adjacency with a neighbor over a Frame Relay point-to-point subinterface. The physical interface is up/up, and the subinterface is configured with an IP address. The engineer checks the EIGRP configuration and sees that the network statement includes the subnet of the subinterface. What is the most likely cause of the adjacency failure?

Question 9easymultiple choice
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A network engineer is troubleshooting an EIGRP issue where a router is not learning any routes from a neighbor, but the neighbor adjacency is up. The engineer checks the EIGRP topology table and sees that the neighbor is listed, but no routes are present. The engineer also checks the interface configuration and sees that the interface is configured as a passive interface under the EIGRP process. What is the most likely cause of the issue?

Question 10easymultiple choice
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An engineer is troubleshooting an EIGRP issue where a router is not learning a specific route from a neighbor, but other routes from the same neighbor are being learned. The engineer checks the EIGRP topology table and sees that the route is not present. The engineer also checks the neighbor's routing table and confirms that the route exists. What is the most likely cause?

Question 11mediummultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp neighbors

EIGRP-IPv4 Neighbors for AS(100) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.1.1.2 Gi0/0 13 00:12:34 12 200 0 45 1 10.2.2.2 Gi0/1 12 00:10:20 15 200 0 32 2 10.3.3.2 Gi0/2 14 00:08:15 18 200 0 28 3 10.4.4.2 Gi0/3 13 00:06:10 20 200 0 22

Based on this output, which statement is correct?

Question 12hardmultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp topology

EIGRP-IPv4 Topology Table for AS(100)/ID(192.168.1.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status

P 10.10.10.0/24, 1 successors, FD is 28160 via 10.1.1.2 (28160/28160), GigabitEthernet0/0 P 10.20.20.0/24, 1 successors, FD is 28160 via 10.2.2.2 (28160/28160), GigabitEthernet0/1 P 10.30.30.0/24, 1 successors, FD is 28160 via 10.3.3.2 (28160/28160), GigabitEthernet0/2 A 10.40.40.0/24, 0 successors, FD is Infinity via 10.4.4.2 (Infinity/Infinity), GigabitEthernet0/3

Based on this output, what is the problem?

Question 13mediummultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp interfaces

EIGRP-IPv4 Interfaces for AS(100) Xmit Queue Mean Pacing Time Multicast Pending

Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes

Gi0/0 1 0/0 12 0/10 50 0 Gi0/1 1 0/0 15 0/10 50 0 Gi0/2 1 0/0 18 0/10 50 0 Gi0/3 1 0/0 20 0/10 50 0 Gi0/4 0 0/0 0 0/10 50 0

Based on this output, which statement is correct?

Question 14mediummultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp traffic

EIGRP-IPv4 Traffic Statistics for AS(100) Hellos sent/received: 5000/4995 Updates sent/received: 150/148 Queries sent/received: 10/8 Replies sent/received: 8/10 Acks sent/received: 300/298 Input queue high water mark: 10 Input queue drops: 0 SIA-Queries sent/received: 0/0 SIA-Replies sent/received: 0/0 Hello process ID: 123 PDM process ID: 124 Socket queue: 0/2000/10/0 (current/max/highest/drops) Input queue: 0/2000/10/0 (current/max/highest/drops)

Based on this output, which statement is correct?

Question 15hardmultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp neighbors detail

EIGRP-IPv4 Neighbors for AS(100) H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.1.1.2 Gi0/0 13 00:12:34 12 200 0 45 Version 12.0/2.0, Retrans: 0, Retries: 0, Restarts: 0 Topology ids from peer: 0 Passive interface: No Hello interval: 5 Hold time: 15

Based on this output, what is the problem?

Question 16hardmultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp topology 10.10.10.0/24

EIGRP-IPv4 Topology Entry for AS(100)/ID(192.168.1.1) for 10.10.10.0/24 State: Passive, Reply status: 0, Originating router: 192.168.1.1 Routing Descriptor Blocks:

0.0.0.0 (Null0) from 0.0.0.0, Send flag: 0x0

Composite metric: (2560000000/0), Route is Internal Vector metric: Minimum bandwidth: 100000 Kbit Total delay: 100 microseconds Reliability: 255/255 Load: 1/255 Minimum MTU: 1500 Hop count: 0

Based on this output, what is the problem?

Question 17mediummultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp topology all-links

EIGRP-IPv4 Topology Table for AS(100)/ID(192.168.1.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status

P 10.10.10.0/24, 1 successors, FD is 28160, Qos: 0 via 10.1.1.2 (28160/28160), GigabitEthernet0/0 via 10.2.2.2 (28672/28160), GigabitEthernet0/1 P 10.20.20.0/24, 1 successors, FD is 28160, Qos: 0 via 10.2.2.2 (28160/28160), GigabitEthernet0/1 via 10.3.3.2 (28672/28160), GigabitEthernet0/2

Based on this output, which statement is correct?

Question 18mediummultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp interfaces detail Gi0/0

EIGRP-IPv4 Interfaces for AS(100)

Interface: GigabitEthernet0/0

Peers: 1 Xmit Queue Un/Reliable: 0/0 Mean SRTT: 12 Pacing Time Un/Reliable: 0/10 Multicast Flow Timer: 50 Pending Routes: 0 Hello interval: 5 Hold time: 15 Split horizon: Enabled Next multicast: 0.0.0.0 Next broadcast: 0.0.0.0

Based on this output, what is the problem?

Question 19hardmultiple choice
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A network engineer runs the following command on Router R1:

R1# show ip eigrp topology 10.50.50.0/24

EIGRP-IPv4 Topology Entry for AS(100)/ID(192.168.1.1) for 10.50.50.0/24 State: Active, Reply status: 0, Originating router: 192.168.1.1 Routing Descriptor Blocks:

10.1.1.2 (GigabitEthernet0/0), from 10.1.1.2, Send flag: 0x0

Composite metric: (4294967295/4294967295), Route is Internal Vector metric: Minimum bandwidth: 100000 Kbit Total delay: 100 microseconds Reliability: 255/255 Load: 1/255 Minimum MTU: 1500 Hop count: 1

Based on this output, what is the problem?

Question 20mediummultiple choice
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Consider the following EIGRP configuration on Router R1:

router eigrp 100
 network 10.0.0.0
 passive-interface default
 no passive-interface GigabitEthernet0/0

What is the effect of this configuration?

Question 21mediummultiple choice
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Given the following EIGRP configuration on Router R2:

router eigrp 200
 network 192.168.1.0
 network 10.0.0.0
 no auto-summary

Which statement is true about the operation of EIGRP?

Question 22mediummultiple choice
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Examine the following EIGRP configuration on Router R3:

interface GigabitEthernet0/1
 ip bandwidth-percent eigrp 100 50

What is the effect of this command?

Question 23mediummultiple choice
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Consider the following EIGRP configuration on Router R4:

router eigrp 300

variance 2

network 172.16.0.0

What is the purpose of the variance command?

Question 24mediummultiple choice
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Given the following configuration snippet on Router R5:

router eigrp 400
 network 10.1.1.0 0.0.0.255

What is wrong with this configuration?

Question 25mediummultiple choice
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Examine the following EIGRP configuration on Router R6:

interface GigabitEthernet0/2
 ip hello-interval eigrp 100 15
 ip hold-time eigrp 100 45

What is the effect of these commands?

Question 26easymultiple choice
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What is the default EIGRP hello interval on a point-to-point serial interface?

Question 27mediummultiple choice
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Which of the following is a mandatory condition for a route to be considered a feasible successor in EIGRP?

Question 28easymultiple choice
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What is the default administrative distance for internal EIGRP routes?

Question 29mediummulti select
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Which TWO commands would a network engineer use to verify that EIGRP is correctly forming neighbor adjacencies and exchanging routes on an interface? (Choose TWO.)

Question 30hardmulti select
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Which TWO statements about EIGRP stub routing are true when troubleshooting a hub-and-spoke topology? (Choose TWO.)

Question 31mediummulti select
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Which TWO configuration steps are required to enable EIGRP authentication between two directly connected routers? (Choose TWO.)

More EIGRP Troubleshooting questions available in the full practice test.

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Layer 3 Technologies

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OSPF Troubleshooting (v2/v3)

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All 300-410 Objectives

  • 100.Layer 3 Technologies35%
  • 101.EIGRP Troubleshooting
  • 102.OSPF Troubleshooting (v2/v3)
  • 103.BGP Troubleshooting
  • 104.Route Redistribution
  • 105.Policy-Based Routing (PBR)
  • 106.VRF-Lite
  • 107.Route Maps and Route Filtering
  • 108.Administrative Distance
  • 109.Route Summarization
  • 110.Bidirectional Forwarding Detection (BFD)
  • 200.VPN Technologies20%
  • 201.MPLS Operations
  • 202.MPLS L3VPN
  • 203.DMVPN
  • 204.IPsec Site-to-Site VPN
  • 205.IPv6 Tunneling Techniques
  • 300.Infrastructure Security20%
  • 301.Device Access Control
  • 302.IPv4 Access Control Lists
  • 303.IPv6 Traffic Filtering and uRPF
  • 304.Control Plane Policing (CoPP)
  • 305.IPv6 First Hop Security
  • 400.Infrastructure Services25%
  • 401.Device Management
  • 402.SNMP Troubleshooting
  • 403.Network Logging and Syslog
  • 404.Embedded Event Manager (EEM)
  • 405.IP SLA
  • 406.NetFlow and Flexible NetFlow
  • 407.SPAN, RSPAN, and ERSPAN
  • 408.DHCP (IPv4 and IPv6)
  • 409.NAT and PAT