350-401 EIGRP Practice Test 2 — 15 Questions

Question 1

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   192.168.1.2             Gi0/0            13 00:12:34   12   100  0  45
  Version 2.0/2.0, Retrans: 0, Retry: 0, Maxseq: 0
  Prefixes: 3
  Topology ids: 0
  Authentication: None
  Topology: base (0x0)

Based on this output, what can be concluded?

Accepted Answer

The neighbor has advertised 3 prefixes to R1.. The output shows 'Prefixes: 3' under the neighbor details, which indicates that the neighbor has advertised exactly three prefixes to R1. This is a direct interpretation of the 'show ip eigrp neighbors detail' command, where the 'Prefixes' field lists the number of routes learned from that neighbor.

Answer

The neighbor is using EIGRP version 1.

Answer

There is a high number of retransmissions indicating packet loss.

Answer

The neighbor is using MD5 authentication.

Question 2

A network engineer runs the following command on Router R1:

R1# show ip eigrp interfaces
EIGRP-IPv4 Interfaces for AS(100)

Interface                   Peers    Xmit Queue   Mean   Pacing Time   Multicast    Pending
                           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        55           0

Based on this output, what can be concluded?

Accepted Answer

Interface Gi0/1 has higher latency than Gi0/0.. The 'Mean SRTT' (Smooth Round-Trip Time) column shows the average time in milliseconds for EIGRP packets to reach a neighbor and receive an acknowledgment. Gi0/1 has an SRTT of 15 ms, while Gi0/0 has an SRTT of 12 ms, indicating higher latency on Gi0/1. This directly correlates to the path's delay, which EIGRP uses in its composite metric calculation.

Answer

Both interfaces have pending routes to send.

Answer

The router is using EIGRP named mode.

Answer

There is a queue backlog on Gi0/0.

Question 3

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 10.1.1.0/24, 1 successors, FD is 1310720, serno 5
        via 192.168.1.2 (1310720/1310720), GigabitEthernet0/0
        via 10.2.2.2 (1587200/1310720), GigabitEthernet0/1
P 10.2.2.0/24, 1 successors, FD is 1310720, serno 6
        via 192.168.1.2 (1310720/1310720), GigabitEthernet0/0
        via 10.2.2.2 (1587200/1310720), GigabitEthernet0/1

Based on this output, what can be concluded?

Accepted Answer

The router has two paths to 10.1.1.0/24, but only one is in the routing table.. The output shows that for 10.1.1.0/24, the feasible distance (FD) is 1310720 and there is only one successor (the route via 192.168.1.2). The alternate path via 10.2.2.2 has a reported distance (RD) of 1310720, which equals the FD, so it does not satisfy the feasibility condition (RD < FD) and therefore is not a feasible successor. Only the successor route is installed in the routing table.

Answer

Both routes have a feasible successor via 10.2.2.2.

Answer

The route 10.1.1.0/24 has two successors.

Answer

The alternate path via 10.2.2.2 will be used immediately if the successor fails.

Question 4

Consider the following EIGRP configuration on a Cisco IOS router:

router eigrp 100
 network 10.0.0.0
 passive-interface default
 no passive-interface GigabitEthernet0/1

What is the effect of this configuration?

Accepted Answer

All interfaces except GigabitEthernet0/1 are passive and will not form EIGRP adjacencies.. The 'passive-interface default' command sets all interfaces to passive by default, preventing them from sending EIGRP hellos and forming adjacencies. The 'no passive-interface GigabitEthernet0/1' command then overrides this default for that specific interface, allowing it to send hellos and form adjacencies. Therefore, only GigabitEthernet0/1 is active for EIGRP neighbor discovery, while all other interfaces remain passive.

Answer

EIGRP hellos are sent on all interfaces, but GigabitEthernet0/1 is prevented from forming adjacencies.

Answer

Only the network 10.0.0.0 is advertised, and all interfaces are passive.

Answer

EIGRP will only form adjacencies on interfaces with an IP address in the 10.0.0.0/8 range.

Question 5

Given the following EIGRP configuration on a router:

router eigrp 200
 network 192.168.1.0 0.0.0.255
 network 10.0.0.0

Which statement about this configuration is true?

Accepted Answer

EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range.. Option A is correct because the first network statement uses a wildcard mask (0.0.0.255) to enable EIGRP only on interfaces in the 192.168.1.0/24 subnet, while the second network statement (10.0.0.0) is classful and enables EIGRP on all interfaces in the 10.0.0.0/8 range. EIGRP network statements can include a wildcard mask to specify a subnet; without one, the router assumes the classful boundary.

Answer

Both network statements are classful and will enable EIGRP on all interfaces with IP addresses in the 192.168.0.0/16 and 10.0.0.0/8 ranges.

Answer

EIGRP will only be enabled on interfaces with an IP address in the 192.168.1.0/24 range.

Answer

This configuration will cause an error because wildcard masks are not allowed in EIGRP network statements.

Question 6

Examine the following EIGRP configuration snippet:

interface GigabitEthernet0/0
 ip bandwidth-percent eigrp 100 50

What is the effect of this command?

Accepted Answer

EIGRP will use up to 50% of the interface bandwidth for its control traffic.. The `ip bandwidth-percent eigrp 100 50` command configures EIGRP to use up to 50% of the interface's configured bandwidth for its control traffic (hello, update, query, and reply packets). This limits the amount of bandwidth EIGRP can consume to prevent it from starving other traffic. The percentage is applied to the interface's `bandwidth` setting, not the actual physical link speed.

Answer

EIGRP will only advertise routes that have a metric within 50% of the best path.

Answer

EIGRP will use 50% of the interface bandwidth for data traffic.

Answer

EIGRP will reduce its hello interval by 50%.

Question 7

Consider the following EIGRP configuration:

router eigrp 100
 metric weights 0 1 0 1 0 0

What does this configuration accomplish?

Accepted Answer

It sets the EIGRP metric to use bandwidth and delay only, which is the default behavior.. The `metric weights` command in EIGRP allows you to modify the K values used in the composite metric calculation. The default K values are K1=1, K2=0, K3=1, K4=0, K5=0, which means only bandwidth (K1) and delay (K3) are used. The configuration `metric weights 0 1 0 1 0 0` explicitly sets K1=1, K2=0, K3=1, K4=0, K5=0, which matches the default behavior. Therefore, option A is correct.

Answer

It disables the use of bandwidth in the metric calculation.

Answer

It enables the use of load and reliability in the metric calculation.

Answer

It changes the metric to use only delay.

Question 8

Given the following EIGRP named mode configuration:

router eigrp TEST
 address-family ipv4 unicast autonomous-system 100
 network 10.0.0.0 0.255.255.255
 topology base
 distance eigrp 90 170
 exit-address-family

Which statement is true?

Accepted Answer

The administrative distance for internal EIGRP routes is set to 90, and for external routes to 170.. Option A is correct because the 'distance eigrp 90 170' command explicitly sets the administrative distance for internal EIGRP routes to 90 and for external EIGRP routes to 170. This overrides the default values of 90 for internal and 170 for external routes, but in this configuration, the values are set to the same defaults, so the statement accurately describes the configured distances.

Answer

The network statement will enable EIGRP on all interfaces with an IP address starting with 10.

Answer

The autonomous-system number must match the process ID in classic mode.

Answer

The 'topology base' command is optional and can be omitted.

Question 9

Examine the following EIGRP configuration for route summarization:

interface GigabitEthernet0/0
 ip summary-address eigrp 100 192.168.0.0 255.255.252.0

What is the effect of this command?

Accepted Answer

EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route.. Option A is correct because the `ip summary-address eigrp` command creates a summary route (192.168.0.0/22) that EIGRP advertises out of the specified interface, and it automatically installs a discard (null0) route to prevent routing loops when the summary is advertised but some component routes may not be present in the routing table.

Answer

EIGRP will only accept routes within the 192.168.0.0/22 range on this interface.

Answer

The summary route will have a metric equal to the best metric among the component routes.

Answer

This command will cause EIGRP to automatically summarize routes to their classful boundaries.

Question 10

What is the default EIGRP hello interval on a point-to-point serial link?

Accepted Answer

5 seconds. The default EIGRP hello interval on a point-to-point serial link is 5 seconds. EIGRP uses different hello intervals depending on the media type: for high-speed broadcast links (e.g., Ethernet) and point-to-point links, the default is 5 seconds; for multipoint non-broadcast links (e.g., Frame Relay), the default is 60 seconds.

Answer

10 seconds

Answer

30 seconds

Answer

60 seconds

Question 11

Which of the following is used by EIGRP to calculate the feasible distance (FD) of a route?

Accepted Answer

The sum of the advertised distance (AD) of the successor and the link cost to the successor.. EIGRP calculates the Feasible Distance (FD) as the sum of the Advertised Distance (AD) from the successor neighbor and the link cost (metric) to that neighbor. This represents the total metric from the local router to the destination network via that path. The FD is used to determine the best route (successor) and to compare against feasible successors.

Answer

The lowest hop count among all paths to the destination.

Answer

The highest bandwidth among all paths to the destination.

Answer

The sum of all delays along the path.

Question 12

What is the default hold time multiplier for EIGRP?

Accepted Answer

3. The default hold time multiplier for EIGRP is 3. This multiplier is applied to the hello interval to calculate the hold time (hold time = hello interval × multiplier). By default, EIGRP uses a hello interval of 5 seconds on most interfaces (or 60 seconds on low-speed NBMA interfaces), so the default hold time is 15 seconds (5 × 3) or 180 seconds (60 × 3).

Answer

4

Answer

5

Answer

10

Question 13

Drag and drop the steps of EIGRP DUAL route computation into the correct order, from first to last.

Accepted Answer

Identify feasible successors using reported distance. EIGRP DUAL first identifies feasible successors via reported distance, then selects the best path as successor. If the successor fails, it checks feasible successors; if none exist, it goes active and queries neighbors. After replies, it computes a new successor.

Question 14

Drag and drop the steps of EIGRP neighbor establishment into the correct order, from first to last.

Accepted Answer

Send Hello packets to discover neighbors. EIGRP neighbor formation begins with sending Hello packets, then exchanging full routing tables via Update packets, acknowledging with ACK packets, and finally entering the Established state where incremental updates are sent.

Question 15

Drag and drop the steps of EIGRP route summarization configuration into the correct order, from first to last.

Accepted Answer

Enable EIGRP with router eigrp AS. EIGRP route summarization first requires enabling EIGRP, configuring the network statement, then entering interface configuration mode, applying the summary-address command, and finally verifying the summary route in the routing table.