300-410 Practice Exam 58 — 20 Questions

Question 1

A network engineer runs the following command on Router R1:

R1# show ip route 10.1.1.0
Routing entry for 10.1.1.0/24
  Known via "eigrp 100", distance 170, metric 2560000
  Redistributing via eigrp 100
  Advertised by eigrp 100 (self originated)
  Last update from 10.2.2.2 on GigabitEthernet0/1, 00:00:10 ago
  Routing Descriptor Blocks:
  * 10.2.2.2, from 10.2.2.2, 00:00:10 ago, via GigabitEthernet0/1
      Route metric is 2560000, traffic share count is 1
      Total delay is 100 microseconds, minimum bandwidth is 100000 Kbit
      Reliability 255/255, minimum MTU 1500
      Loading 1/255, Hops 1

Based on this output, what is the problem?

Accepted Answer

The route is redistributed into EIGRP from another protocol, as indicated by the distance of 170 and the 'self originated' message.. The output shows a route learned via EIGRP with an administrative distance of 170, which is the default for external EIGRP routes. The route is marked as 'Redistributing via eigrp 100' and 'Advertised by eigrp 100 (self originated)', indicating that this route was redistributed into EIGRP from another protocol. The problem is that the route is both learned and redistributed by the same router, which could cause a routing loop if not filtered.

Answer

The route 10.1.1.0/24 is an internal EIGRP route because the administrative distance is 90.

Answer

The route is learned from a neighbor with a metric of 2560000, which is the default for redistributed routes.

Answer

The route is not being advertised to any EIGRP neighbors because it is marked as 'self originated'.

Question 2

A network engineer runs the following command to troubleshoot an EEM issue:

R1# show event manager detector

Detector Name : syslog
  Detector Type : system
  Detector State : enabled
  Detector Queue Size : 100
  Detector Queue Max : 200
  Detector Events Triggered : 15

Detector Name : timer
  Detector Type : system
  Detector State : enabled
  Detector Queue Size : 0
  Detector Queue Max : 50
  Detector Events Triggered : 3

What does this output indicate?

Accepted Answer

Both syslog and timer detectors are enabled. The syslog detector has triggered 15 events and has 100 events in its queue.. The output shows the status of EEM detectors. Detectors are components that monitor for specific events (syslog, timer, etc.). The output shows each detector's state (enabled/disabled), queue size and maximum, and the number of events triggered. Queue size indicates pending events waiting to be processed.

Answer

The syslog detector is disabled and needs to be enabled for EEM to work.

Answer

The timer detector has triggered 3 events and has 50 events in its queue.

Answer

The queue size of 100 for syslog indicates that 100 events have been dropped.

Question 3

A network engineer runs the following command on Router R1:

R1# show ip ospf interface GigabitEthernet0/1
GigabitEthernet0/1 is up, line protocol is up
  Internet Address 10.1.1.1/24, Area 0
  Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated Router (ID) 1.1.1.1, Interface address 10.1.1.1
  Backup Designated router (ID) 2.2.2.2, Interface address 10.1.1.2
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:03
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 1/1, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 25
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 2.2.2.2  (Backup Designated Router)
  Suppress hello for 0 neighbor(s)

Based on this output, what is the problem?

Accepted Answer

The output shows no external routes are being redistributed, but this is a normal interface status.. The output shows R1 is the Designated Router (DR) on a broadcast network. The neighbor count is 1, which is normal. However, the problem might be that redistribution is not happening because the interface is in area 0, but no external routes are seen. The output itself does not show a direct problem; it is a normal OSPF interface state. The question likely expects the candidate to note that the interface is functioning correctly, but the context of redistribution might imply that redistribution is configured but not working due to other issues.

Answer

The router is the DR, which is normal, but the neighbor count of 1 indicates only one OSPF neighbor is present.

Answer

The interface is in area 0, but redistribution of external routes requires a route-map to set the metric.

Answer

The router ID is 1.1.1.1, which is not reachable from other routers.

Question 4

A network engineer runs the following command to troubleshoot an EEM issue:

R1# show event manager policy configuration TRACK-INTERFACE

Applet TRACK-INTERFACE
  event syslog pattern "OSPF-5-ADJCHG"
  action 1.0 cli command "show ip route"
  action 2.0 cli command "show ip ospf neighbor"
  action 3.0 syslog msg "OSPF adjacency change detected"

What does this output indicate?

Accepted Answer

The applet 'TRACK-INTERFACE' is configured to trigger on syslog message 'OSPF-5-ADJCHG' and execute three actions in order: show ip route, show ip ospf neighbor, and send a syslog message.. The output shows the configuration of a specific EEM applet. It displays the event trigger and the actions in order. Each action has a step number (e.g., 1.0) that determines the order of execution. This is useful for verifying the applet configuration.

Answer

The applet 'TRACK-INTERFACE' is currently executing and has run the first two actions.

Answer

The applet 'TRACK-INTERFACE' has a syntax error because the actions are not numbered correctly.

Answer

The applet 'TRACK-INTERFACE' will only execute the first action because the others are commented out.

Question 5

A network engineer runs the following command on Router R1:

R1# show ip bgp neighbors 10.2.2.2 advertised-routes
BGP table version is 10, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
              x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete

Network          Next Hop            Metric LocPrf Weight Path
*> 10.1.1.0/24      0.0.0.0                  0         32768 i
*> 10.2.2.0/24      0.0.0.0                  0         32768 i

Total number of prefixes 2

Based on this output, what is the problem?

Accepted Answer

The routes are not being advertised to eBGP peers because the next hop is 0.0.0.0, which is invalid for eBGP.. The output shows that R1 is advertising two routes to neighbor 10.2.2.2: 10.1.1.0/24 and 10.2.2.0/24, both with next hop 0.0.0.0. In BGP, a next hop of 0.0.0.0 means the route is originated locally (via network statement or redistribution). The problem is that the next hop should be the router's own interface IP when advertising to an eBGP neighbor, but 0.0.0.0 is used for local routes. This could indicate that the routes are not being advertised correctly to eBGP peers because the next hop is not updated.

Answer

The routes are correctly advertised with next hop 0.0.0.0, which is normal for locally originated routes.

Answer

The routes are being advertised to iBGP peers only, as indicated by the next hop 0.0.0.0.

Answer

The routes are redistributed from an IGP into BGP, and the next hop is correctly set to 0.0.0.0.

Question 6

A network engineer runs the following command to troubleshoot an EEM issue:

R1# debug event manager action syslog

EEM Action Syslog debugging is on

R1#
Mar  1 00:20:45.789: %HA_EM-6-ACTION: applet TRACK-INTERFACE: action syslog msg: 'OSPF adjacency change detected'

What does this output indicate?

Accepted Answer

The EEM applet 'TRACK-INTERFACE' executed a syslog action and generated the message 'OSPF adjacency change detected'.. The debug output shows the execution of syslog actions within an EEM applet. It displays the applet name and the syslog message being generated. This is useful for verifying that syslog actions are working correctly.

Answer

The EEM applet 'TRACK-INTERFACE' received a syslog message 'OSPF adjacency change detected'.

Answer

The debug output shows the configuration of the syslog action for applet 'TRACK-INTERFACE'.

Answer

The syslog message was generated by the system, not by the EEM applet.

Question 7

A network engineer runs the following command on Router R1:

R1# show ip eigrp interfaces detail GigabitEthernet0/1
IP-EIGRP interfaces for process 100

Xmit Queue   Mean   Pacing Time   Multicast    Pending
Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Gi0/1              1       0/0       10       0/10         50           0
  Hello interval is 5 sec
  Next xmit serial <none>
  Un/reliable mcasts: 0/0  Un/reliable ucasts: 0/0
  Mcast exceptions: 0  CR packets: 0  ACKs suppressed: 0
  Retransmissions: 0  Out of sequence: 0
  Authentication mode: none
  Redistribution: redistributed

Based on this output, what is the problem?

Accepted Answer

The 'redistributed' flag indicates that routes are being redistributed into EIGRP on this interface, which is not a standard EIGRP feature.. The output shows 'Redistribution: redistributed' under the interface details, indicating that redistribution is enabled on this interface. However, this is not a standard field in 'show ip eigrp interfaces detail' output; it is likely a custom or misinterpreted output. The problem is that redistribution is applied per interface, but EIGRP redistribution is a global process, not interface-specific. This could cause confusion or misconfiguration.

Answer

The interface is configured for redistribution, which is correct for EIGRP.

Answer

The interface has one EIGRP neighbor, and redistribution is working correctly.

Answer

The output shows that redistribution is enabled, but the interface is not sending hellos.

Question 8

Which statement correctly describes the default behavior of the Embedded Event Manager (EEM) when an event occurs and no action is explicitly defined?

Accepted Answer

EEM will take no action and the event is silently ignored.. By default, EEM does not perform any action if none is configured; it simply logs the event occurrence.

Answer

EEM will generate a syslog message by default.

Answer

EEM will execute the default action of reloading the device.

Answer

EEM will send an SNMP trap by default.

Question 9

Which statement correctly describes the default value of the 'event timer countdown' when no countdown time is specified?

Accepted Answer

There is no default; a countdown time must be explicitly configured.. The 'event timer countdown' requires an explicit time value; there is no default — the configuration will be rejected if omitted.

Answer

The default countdown time is 60 seconds.

Answer

The default countdown time is 0 seconds, causing immediate trigger.

Answer

The default countdown time is 10 seconds.

Question 10

A network engineer runs the following command on Router R1:

R1# show ip route 192.168.1.0
Routing entry for 192.168.1.0/24
  Known via "ospf 1", distance 110, metric 20, type extern 2, forward metric 100
  Redistributing via ospf 1
  Last update from 10.1.1.2 on GigabitEthernet0/1, 00:00:05 ago
  Routing Descriptor Blocks:
  * 10.1.1.2, from 10.1.1.2, 00:00:05 ago, via GigabitEthernet0/1
      Route metric is 20, traffic share count is 1

Based on this output, what is the problem?

Accepted Answer

The route is being redistributed back into OSPF, which could cause a routing loop if not filtered.. The output shows a route learned via OSPF with type extern 2 and metric 20. The route is also 'Redistributing via ospf 1', meaning this router is redistributing this route back into OSPF. This could cause a routing loop if the route is redistributed back into the same OSPF process from which it was learned. The problem is that the route is being redistributed without filtering, potentially causing loops.

Answer

The route is an external OSPF route with metric 20, which is the default for Type 2 external routes.

Answer

The forward metric is 100, which is the metric to the ASBR.

Answer

The route is learned from neighbor 10.1.1.2, which is the next hop.

Question 11

Consider the following partial configuration on Router R1:

router eigrp 100
 redistribute ospf 1 metric 10000 100 255 1 1500

router ospf 1
 redistribute eigrp 100 subnets

Which statement about this configuration is true?

Accepted Answer

Redistributed OSPF routes into EIGRP will have a default metric of 10000 100 255 1 1500.. The configuration redistributes OSPF routes into EIGRP with specific bandwidth, delay, reliability, load, and MTU metrics. The 'subnets' keyword in OSPF redistribution ensures that all subnets (including classless prefixes) are redistributed. Without 'subnets', only classful networks are redistributed.

Answer

OSPF routes redistributed into EIGRP will have a metric of 20 by default.

Answer

EIGRP routes redistributed into OSPF will be Type 1 external LSAs.

Answer

The 'subnets' keyword in OSPF redistribution is optional but recommended.

Question 12

Which TWO statements about route redistribution between EIGRP and OSPF are true? (Choose TWO.)

Accepted Answer

When redistributing EIGRP into OSPF, the OSPF metric must be explicitly configured if the default metric of 20 is not desired.. When redistributing between EIGRP and OSPF, the seed metric must be explicitly set for the receiving protocol. EIGRP uses a composite metric (bandwidth, delay, reliability, load, MTU) and OSPF uses a metric of type 1 or type 2. By default, OSPF assigns a metric of 20 to redistributed routes unless specified otherwise. Option A is correct because OSPF requires a seed metric for redistributed routes. Option D is correct because EIGRP redistributed routes default to an infinite metric (effectively not advertised) unless a seed metric is provided. Option B is incorrect because OSPF default metric is 20, not 1. Option C is incorrect because the default metric for EIGRP is not 100. Option E is incorrect because route-maps can be used to filter redistributed routes.

Answer

When redistributing OSPF into EIGRP, the default EIGRP metric is 1.

Answer

When redistributing OSPF into EIGRP, the default EIGRP metric is 100.

Answer

Route-maps cannot be used to filter routes during redistribution between EIGRP and OSPF.

Question 13

What is the default timer value for the EEM environment variable 'timer watchdog'?

Accepted Answer

60 seconds. The default watchdog timer is 60 seconds; it monitors the EEM policy execution and resets if exceeded.

Answer

30 seconds

Answer

120 seconds

Answer

180 seconds

Question 14

Given the following configuration on Router R2:

router eigrp 200
 redistribute ospf 1 metric 10000 100 255 1 1500
 default-metric 10000 100 255 1 1500

What is the effect of having both the 'metric' keyword in the redistribute command and the 'default-metric' command?

Accepted Answer

The 'metric' keyword overrides the default-metric for routes redistributed from OSPF into EIGRP.. The 'metric' keyword in the redistribute command overrides the default-metric for that specific redistribution. The default-metric applies to all other redistribution without an explicit metric.

Answer

The 'metric' keyword is ignored; the default-metric is used for all redistributed routes.

Answer

Both metrics are applied, causing a conflict and potential routing issues.

Answer

The default-metric command is not needed and can be removed without any effect.

Question 15

Which THREE symptoms indicate a problem with route redistribution causing suboptimal routing or routing loops? (Choose THREE.)

Accepted Answer

Routing loops occur where packets traverse multiple routers repeatedly.. Route redistribution issues often manifest as routing loops, suboptimal paths, or missing routes. A routing loop (option A) occurs when redistributed routes are re-injected back into the source protocol. Suboptimal routing (option B) happens when a router prefers a redistributed route over a more direct one. Missing routes (option D) can occur if redistribution is not configured or if filters block routes. Option C is incorrect because high CPU may indicate many things, not specifically redistribution. Option E is incorrect because a stable routing table does not indicate a problem.

Answer

CPU utilization on the redistribution router is consistently below 50%.

Answer

The routing table on all routers is stable and converges quickly after a topology change.

Question 16

Which EEM event type uses a default polling interval of 60 seconds when no interval is explicitly configured?

Accepted Answer

event snmp. The 'event snmp' type polls at a default interval of 60 seconds if the 'interval' keyword is omitted.

Answer

event syslog

Answer

event timer

Answer

event cli

Question 17

Examine this partial configuration on Router R3:

router ospf 1
 redistribute rip subnets metric-type 1 metric 50

What is the effect of the 'metric-type 1' keyword?

Accepted Answer

Redistributed RIP routes become OSPF Type 1 external LSAs, and the metric is the sum of the external metric (50) plus the internal OSPF cost to the ASBR.. The metric-type 1 keyword makes the redistributed routes Type 1 external LSAs, which add the internal OSPF cost to the external metric. Type 2 (default) does not add internal cost.

Answer

Redistributed RIP routes become OSPF Type 2 external LSAs with a fixed metric of 50.

Answer

The 'metric-type 1' is ignored because the 'metric' keyword is also used.

Answer

The redistributed routes will have a metric of 50 and will not be affected by internal OSPF cost.

Question 18

Which TWO configuration steps are required to successfully redistribute OSPF routes into EIGRP on a Cisco router? (Choose TWO.)

Accepted Answer

Enter EIGRP router configuration mode using the 'router eigrp <as-number>' command.. To redistribute OSPF into EIGRP, you must enter EIGRP configuration mode and use the redistribute command. Additionally, you must set a seed metric for EIGRP because EIGRP does not have a default metric for redistributed routes. Option A is correct because you need to enter EIGRP router configuration. Option D is correct because you must set a metric (e.g., bandwidth, delay) for the redistributed routes. Option B is incorrect because you do not need to explicitly match routes in OSPF; you can redistribute all OSPF routes. Option C is incorrect because the redistribute command is under EIGRP, not OSPF. Option E is incorrect because the default-information originate command is for OSPF to inject a default route, not for redistribution.

Answer

Configure a route-map under OSPF to match OSPF routes for redistribution.

Answer

Use the 'redistribute eigrp <as-number>' command under OSPF router configuration mode.

Answer

Issue the 'default-information originate' command under OSPF to advertise redistributed routes.

Question 19

Which statement correctly describes the default authentication behavior for EEM policy files stored in flash?

Accepted Answer

EEM does not perform any authentication or integrity check on policy files by default.. EEM does not enforce any authentication by default; policy files are executed as-is without integrity checks.

Answer

EEM requires all policy files to be signed with a digital certificate.

Answer

EEM uses MD5 hash verification by default.

Answer

EEM uses the device's AAA configuration to authenticate policy execution.

Question 20

Consider the following configuration on Router R4:

router eigrp 100
 redistribute ospf 1 metric 10000 100 255 1 1500

router ospf 1
 redistribute eigrp 100 metric 20 metric-type 1 subnets

What is a potential issue with this configuration?

Accepted Answer

Mutual redistribution without route filtering can cause routing loops or suboptimal routing.. Mutual redistribution without route filtering or administrative distance adjustments can cause routing loops or suboptimal routing. The configuration does not include any route-maps or distribute-lists to control which routes are redistributed, which is a common pitfall.

Answer

The configuration is correct and will work without issues.

Answer

The 'metric-type 1' in OSPF redistribution may cause EIGRP routes to be preferred over OSPF routes.

Answer

The EIGRP metric values are invalid because load must be between 1 and 255.