300-410 Practice Exam 57 — 20 Questions

Question 1

A network engineer is troubleshooting a route redistribution issue between EIGRP and OSPF. Routers R1 (EIGRP) and R2 (OSPF) are redistributing routes. The engineer notices that some EIGRP external routes (redistributed into EIGRP from another protocol) are not appearing in the OSPF database on R2. The show ip ospf database external command on R2 does not list these prefixes. What is the most likely cause?

Accepted Answer

The redistribute eigrp command under OSPF is missing the match external keyword.. When redistributing from EIGRP into OSPF, by default only EIGRP internal routes are redistributed; EIGRP external routes are not included unless the match external keyword is specified.

Answer

The redistribute eigrp command under OSPF is missing the subnets keyword.

Answer

EIGRP has a higher administrative distance than OSPF, causing route suppression.

Answer

The OSPF process on R2 has a distribute-list blocking these routes.

Question 2

A network engineer is troubleshooting a route redistribution issue between two OSPF processes. Router R1 runs OSPF process 1 and OSPF process 2, and redistributes routes between them. The engineer notices that routes from OSPF process 1 are not appearing in the OSPF database of process 2, even though the redistribute command is configured. The show ip ospf database command on R1 for process 2 shows no external routes. What is the most likely cause?

Accepted Answer

The redistribute ospf 1 command under OSPF process 2 is missing the subnets keyword.. When redistributing between OSPF processes, the redistribute command must include the subnets keyword to redistribute classless subnets. Without it, only classful networks are redistributed, which may cause many routes to be missing.

Answer

OSPF process 1 has a higher administrative distance than OSPF process 2.

Answer

The redistribute ospf 1 command under OSPF process 2 is missing the match internal keyword.

Answer

OSPF process 2 has a route map applied that is filtering all routes.

Question 3

A network engineer is troubleshooting a route redistribution issue between RIP and OSPF. Router R1 runs both RIP and OSPF, and redistributes RIP routes into OSPF. The engineer notices that RIP routes are not appearing in the OSPF database on neighboring routers. The show ip ospf database external command on a neighbor shows no external routes from R1. The redistribute rip command is configured under OSPF on R1. What is the most likely cause?

Accepted Answer

The redistribute rip command under OSPF is missing the subnets keyword.. When redistributing into OSPF, the subnets keyword is required to redistribute classless subnets. Without it, only classful networks are advertised, which may cause many routes to be missing.

Answer

RIP has a higher administrative distance than OSPF.

Answer

The OSPF process on R1 has a distribute-list blocking these routes.

Answer

The RIP process on R1 is not running.

Question 4

A network engineer is troubleshooting a route redistribution issue between EIGRP and BGP. Router R1 runs both EIGRP and BGP, and redistributes EIGRP routes into BGP. The engineer notices that some EIGRP routes are not appearing in the BGP table on R1. The show ip bgp command does not list these prefixes. The redistribute eigrp command is configured under BGP. What is the most likely cause?

Accepted Answer

The EIGRP routes are not present in the IP routing table on R1.. When redistributing into BGP, by default only classful networks are redistributed unless the subnets keyword is used. Additionally, BGP does not redistribute routes that are not in the routing table. However, a common cause is that the EIGRP routes are not in the global routing table due to administrative distance or other reasons.

Answer

The redistribute eigrp command under BGP is missing the subnets keyword.

Answer

BGP has a higher administrative distance than EIGRP.

Answer

The EIGRP process on R1 has a route filter blocking these routes.

Question 5

A network engineer is troubleshooting a route redistribution issue between OSPF and BGP. Router R1 runs both OSPF and BGP, and redistributes OSPF routes into BGP. The engineer notices that OSPF external routes are not appearing in the BGP table on R1. The show ip bgp command does not list these prefixes. The redistribute ospf 1 match external command is configured under BGP. What is the most likely cause?

Accepted Answer

The redistribute ospf 1 match external command under BGP is missing the subnets keyword.. When redistributing OSPF into BGP, the subnets keyword is required to redistribute classless subnets. Without it, only classful networks are redistributed, which may cause many routes to be missing.

Answer

OSPF has a higher administrative distance than BGP.

Answer

The OSPF process on R1 has a distribute-list blocking these routes.

Answer

BGP requires the network command to advertise routes, not redistribution.

Question 6

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

R1# show event manager policy registered

No.  Class        Type    Version   Time Created          Name
  1  applet       system  1.0       Mar 1 00:00:12 2025  TRACK-INTERFACE
  2  applet       system  1.0       Mar 1 00:00:15 2025  BGP-RESET
  3  applet       user    1.0       Mar 1 00:02:30 2025  LOG-ERROR

What does this output indicate?

Accepted Answer

Three EEM applets are registered, including two system-defined and one user-defined.. The output shows three registered EEM applets. The 'Class' column indicates whether the applet is system-defined or user-defined. 'Type' is always 'applet' for EEM applets. 'Time Created' shows when the applet was registered. The 'Name' is the applet name. This output confirms that the applets are registered and available for execution.

Answer

Three EEM applets are registered, all user-defined.

Answer

Three EEM applets are registered, all system-defined.

Answer

The output shows the EEM applets that are currently executing.

Question 7

A network engineer is troubleshooting a route redistribution issue between EIGRP and OSPF. Routers R1 (EIGRP) and R2 (OSPF) are redistributing routes. The engineer notices that some EIGRP routes are appearing in the OSPF database on R2, but traffic to those destinations is not being forwarded correctly. The show ip route command on R2 shows the redistributed routes with a next-hop of 0.0.0.0. What is the most likely cause?

Accepted Answer

The redistribute eigrp command under OSPF is missing the subnets keyword.. When redistributing into OSPF, if the redistributed routes are not directly connected to the redistributing router, the next-hop may be set to 0.0.0.0 (self) if the subnets keyword is missing or if the route is not in the routing table. However, a common cause is that the redistribute command is missing the subnets keyword, causing classful behavior.

Answer

The OSPF process on R2 has a route map that is changing the next-hop.

Answer

EIGRP has a lower administrative distance than OSPF.

Answer

The EIGRP routes are not in the routing table on R2.

Question 8

A network engineer is troubleshooting a route redistribution issue between OSPF and EIGRP. Routers R1 (OSPF) and R2 (EIGRP) are redistributing routes. The engineer notices that some OSPF routes are appearing in the EIGRP topology table on R2, but traffic to those destinations is being dropped. The show ip route command on R2 shows the redistributed routes with a next-hop of the R1 interface, but the route is not installed in the routing table. What is the most likely cause?

Accepted Answer

The redistribute ospf command under EIGRP is missing the default-metric configuration.. When redistributing from OSPF into EIGRP, the redistributed routes may have a next-hop that is not reachable via EIGRP, causing the route to be not installed in the routing table. This is often due to the default-metric not being set, causing EIGRP to use an incorrect metric.

Answer

OSPF has a higher administrative distance than EIGRP.

Answer

The EIGRP process on R2 has a distribute-list blocking these routes.

Answer

The OSPF process on R1 has a route filter blocking these routes.

Question 9

A network engineer is troubleshooting a route redistribution issue between two EIGRP processes. Router R1 runs EIGRP AS 100 and EIGRP AS 200, and redistributes routes between them. The engineer notices that routes from EIGRP AS 100 are not appearing in the EIGRP topology table of AS 200 on R1. The redistribute eigrp 100 command is configured under EIGRP AS 200. What is the most likely cause?

Accepted Answer

The redistribute eigrp 100 command under EIGRP AS 200 is missing the metric specification.. When redistributing between EIGRP processes, the redistribute command must include the metric values (bandwidth, delay, reliability, load, MTU) or a default-metric must be configured. Without a metric, the redistributed routes are not accepted.

Answer

EIGRP AS 100 has a higher administrative distance than EIGRP AS 200.

Answer

The redistribute eigrp 100 command under EIGRP AS 200 is missing the subnets keyword.

Answer

EIGRP AS 200 has a route map that is filtering all routes.

Question 10

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

R1# show event manager history events

Event History:
  Event Type    : syslog
  Time          : Mar 1 00:05:23
  Pattern       : OSPF-5-ADJCHG
  Trigger count : 1

Event Type    : timer
  Time          : Mar 1 00:06:00
  Timer Type    : absolute
  Timer Name    : MY-TIMER
  Trigger count : 1

What does this output indicate?

Accepted Answer

Two events have triggered EEM applets: a syslog event matching 'OSPF-5-ADJCHG' and an absolute timer named 'MY-TIMER'.. The output shows the event history for EEM. It lists events that have triggered EEM applets. Each entry shows the event type (syslog, timer, etc.), the time it occurred, specific details (pattern for syslog, timer type and name for timer), and the number of times that event triggered an applet. This helps in troubleshooting which events are being matched.

Answer

Two EEM applets are currently registered: one for syslog and one for timer.

Answer

The OSPF-5-ADJCHG syslog event triggered an applet that executed a timer.

Answer

The timer event is a countdown timer that triggered after 5 minutes and 23 seconds.

Question 11

A network engineer runs the following command on Router R1:

R1# show ip eigrp topology 10.1.1.0/24
IP-EIGRP (AS 100): Topology entry for 10.1.1.0/24
  State: Passive, Originating reply status: 0
  Routing Descriptor Blocks:
  0.0.0.0 (Null0), from 0.0.0.0, Send flag: 0x0
      Composite metric is (2560000000/0), Route is Internal
      Vector metric:
        Minimum bandwidth is 100000 Kbit
        Total delay is 100 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 0
  10.2.2.2 (GigabitEthernet0/1), from 10.2.2.2, Send flag: 0x0
      Composite metric is (2688000000/2560000000), Route is Internal
      Vector metric:
        Minimum bandwidth is 100000 Kbit
        Total delay is 200 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1

Based on this output, what is the problem?

Accepted Answer

A manual summary route is configured on R1 for 10.1.1.0/24, causing a local Null0 entry.. The output shows a Null0 entry with a metric of 2560000000/0, which is characteristic of a summary route. The problem is that an EIGRP summary route is being advertised, but the route is also learned from another neighbor (10.2.2.2) with a higher metric, indicating potential suboptimal routing or a missing 'no auto-summary' command.

Answer

The route 10.1.1.0/24 is redistributed from another protocol into EIGRP.

Answer

The route 10.1.1.0/24 is flapping between Passive and Active states.

Answer

The neighbor 10.2.2.2 is not reachable, so the route is installed via Null0.

Question 12

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

R1# debug event manager action cli

EEM Action CLI debugging is on

R1#
Mar  1 00:10:15.123: %HA_EM-6-ACTION: applet TRACK-INTERFACE: action cli command: 'show ip int brief' executed
Mar  1 00:10:15.456: %HA_EM-6-ACTION: applet TRACK-INTERFACE: action cli output: 'Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         192.168.1.1     YES NVRAM  up                    up
GigabitEthernet0/1         10.0.0.1        YES NVRAM  up                    up
Loopback0                  1.1.1.1         YES NVRAM  up                    up'

What does this output indicate?

Accepted Answer

The EEM applet 'TRACK-INTERFACE' executed the command 'show ip int brief' and the output was displayed.. The debug output shows the execution of CLI actions within an EEM applet. It displays the applet name, the CLI command being executed, and the output of that command. This is useful for verifying that CLI actions are working correctly and seeing the exact output returned.

Answer

The EEM applet 'TRACK-INTERFACE' failed to execute the command 'show ip int brief'.

Answer

The debug output shows the EEM applet configuration for 'TRACK-INTERFACE'.

Answer

The command 'show ip int brief' was executed manually by the engineer.

Question 13

A network engineer runs the following command on Router R1:

R1# show ip ospf database external 10.1.1.0

OSPF Router with ID (1.1.1.1) (Process ID 1)

Type-5 AS External Link States (Area 0)

LS age: 120
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 10.1.1.0 (External Network Number)
  Advertising Router: 2.2.2.2
  LS Seq Number: 80000001
  Checksum: 0x1234
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state path)
        TOS: 0
        Metric: 20
        Forward Address: 0.0.0.0
        External Route Tag: 100

Based on this output, which statement is correct?

Accepted Answer

The route 10.1.1.0/24 is redistributed into OSPF from another protocol with a route-map setting the tag to 100.. The output shows an OSPF Type-5 external LSA for 10.1.1.0/24 with Metric Type 2 and Metric 20. The default metric for redistributed routes in OSPF is 20 for Type 2. The External Route Tag of 100 indicates a redistribution tag, often used for filtering or route-maps.

Answer

The route 10.1.1.0/24 is an OSPF inter-area route from area 0.

Answer

The metric of 20 indicates the route is redistributed with a default metric of 20, which is correct for Type 1 external routes.

Answer

The forward address of 0.0.0.0 indicates that the next hop is the advertising router 2.2.2.2.

Question 14

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

R1# show event manager policy active

No.  Class        Type    Version   Time Created          Name
  1  applet       system  1.0       Mar 1 00:00:12 2025  TRACK-INTERFACE
  Event Type: syslog (pattern OSPF-5-ADJCHG)
  Action: cli command 'show ip route'

What does this output indicate?

Accepted Answer

The EEM applet 'TRACK-INTERFACE' is active and will execute 'show ip route' when a syslog message matching 'OSPF-5-ADJCHG' is generated.. The output shows active EEM policies that are currently enabled and waiting for their trigger events. It displays the applet name, class, type, version, creation time, the event that triggers it, and the actions it will execute. This helps verify that an applet is active and what it does.

Answer

The EEM applet 'TRACK-INTERFACE' is currently executing and has run 'show ip route'.

Answer

The EEM applet 'TRACK-INTERFACE' has been triggered and the output of 'show ip route' is displayed.

Answer

The EEM applet 'TRACK-INTERFACE' is inactive and needs to be enabled.

Question 15

A network engineer runs the following command on Router R1:

R1# show ip bgp 10.1.1.0/24
BGP routing table entry for 10.1.1.0/24, version 10
Paths: (1 available, best #1, table default)
  Advertised to update-groups:
     1
  Refresh Epoch 1
  Local
    10.2.2.2 from 10.2.2.2 (2.2.2.2)
      Origin IGP, metric 0, localpref 100, valid, external, best
      rx pathid: 0, tx pathid: 0x0
      Community: 100:200

Based on this output, what is the problem?

Accepted Answer

The route 10.1.1.0/24 is redistributed from an IGP into BGP, as indicated by the 'Local' path.. The output shows a BGP route with 'Local' as the path, meaning it was redistributed into BGP locally. The origin is IGP, and the community is 100:200. The route is valid and best. However, the 'Local' path indicates redistribution from an IGP into BGP, which is common in redistribution scenarios.

Answer

The route 10.1.1.0/24 is learned via an eBGP session and has a local preference of 100.

Answer

The community 100:200 is automatically assigned by BGP for all redistributed routes.

Answer

The route is not being advertised to any peers because it is not marked as best.

Question 16

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

R1# show event manager environment all

No.  Variable Name                          Value
  1  _exit_status                           1
  2  _event_type                            syslog
  3  _syslog_msg                            %OSPF-5-ADJCHG: Process 1, Nbr 10.0.0.2 on GigabitEthernet0/0 from LOADING to FULL, Loading Done
  4  _syslog_severity                       5
  5  _syslog_facility                       OSPF
  6  _syslog_mnemonic                       ADJCHG

What does this output indicate?

Accepted Answer

The environment variables show that a syslog event with mnemonic ADJCHG triggered, and the applet can use these variables in actions.. The output shows the EEM environment variables that are set when an event triggers an applet. These variables contain information about the event, such as the event type, syslog message details, and exit status. This is useful for debugging applets that use these variables in their actions.

Answer

The environment variables are configured manually by the engineer to define the applet behavior.

Answer

The output shows the current state of all EEM applets and their variables.

Answer

The _exit_status variable indicates the applet failed to execute.

Question 17

Drag and drop the steps to create and register an EEM applet for syslog events into the correct order, from first to last.

Accepted Answer

Enter global configuration mode. The correct order begins with entering global configuration mode, then defining the EEM applet and its syslog trigger, followed by configuring the action to execute, and finally exiting configuration mode to register the applet.

Question 18

A network engineer runs the following command on Router R1:

R1# show route-map REDISTRIBUTE
route-map REDISTRIBUTE, permit, sequence 10
  Match clauses:
    ip address prefix-list EIGRP_ROUTES
  Set clauses:
    metric 100
    metric-type type-1
    tag 200
  Policy routing matches: 0 packets, 0 bytes

route-map REDISTRIBUTE, deny, sequence 20
  Match clauses:
    ip address prefix-list DENY_ALL
  Set clauses:
  Policy routing matches: 0 packets, 0 bytes

Based on this output, what is the problem?

Accepted Answer

The route-map has a deny sequence that may block all routes if prefix-list DENY_ALL is configured to permit all.. The route-map has a deny sequence 20 that matches prefix-list DENY_ALL. If DENY_ALL is configured to permit all (e.g., permit 0.0.0.0/0 le 32), then all routes will be denied after sequence 10, effectively blocking redistribution. The problem is that the deny sequence may unintentionally block routes that should be redistributed.

Answer

The route-map will redistribute all routes that match prefix-list EIGRP_ROUTES with metric 100 and type-1.

Answer

The route-map will only redistribute routes with tag 200.

Answer

The route-map is not applied to any redistribution command, so it has no effect.

Question 19

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

R1# show event manager history applet TRACK-INTERFACE

Applet TRACK-INTERFACE:
  Time Created : Mar 1 00:00:12 2025
  Time Last Triggered : Mar 1 00:15:30 2025
  Time Last Executed : Mar 1 00:15:30 2025
  Trigger Count : 5
  Execution Count : 5
  Last Event Type : syslog
  Last Event Detail : OSPF-5-ADJCHG
  Last Action Executed : show ip route
  Last Action Result : Success

What does this output indicate?

Accepted Answer

The applet 'TRACK-INTERFACE' has been triggered 5 times and executed successfully each time, with the last trigger at 00:15:30.. The output shows the history for a specific EEM applet. It includes creation time, last trigger and execution times, trigger and execution counts, the last event that triggered it, the last action executed, and the result. This helps in determining if the applet is being triggered and executing successfully.

Answer

The applet 'TRACK-INTERFACE' has failed to execute 5 times.

Answer

The applet 'TRACK-INTERFACE' has not been triggered since it was created.

Answer

The applet 'TRACK-INTERFACE' executed the action 'show ip route' but the output was not captured.

Question 20

What is the default behavior of EEM when multiple policies are registered for the same event?

Accepted Answer

Policies run in order of priority (lower number = higher priority), then alphabetically by name.. EEM policies are executed in order of their priority; if priorities are equal, the policy with the lowest name (alphanumeric) runs first.

Answer

All policies run simultaneously in parallel.

Answer

Only the first registered policy runs.

Answer

Policies run in reverse order of registration.