JN0-106 Practice Test 9 — 10 Questions

Question 1

Which two statements correctly describe Junos OS login classes? (Choose two.)

Accepted Answer

They are defined under the [edit system login class] hierarchy.. Option B is correct because login classes are configured at the [edit system login class class-name] hierarchy in Junos OS, where you define permissions and other login parameters. Option D is correct because a login class can include or exclude the configure permission, thereby restricting whether a user can enter configuration mode. Options A, C, and E are incorrect: login classes do not force operational-mode-only access (that depends on permissions such as configure), they are not automatically assigned to all users by default (each user must be associated with a class, otherwise the default class applies), and they can be modified or deleted after creation.

Answer

They allow users to enter only operational mode.

Answer

They are automatically assigned to all users by default.

Answer

They cannot be modified after creation.

Question 2

A BGP session is flapping. The engineer runs 'show log messages' and sees 'BGP recv Notification' with error code 'Cease'. What does this indicate?

Accepted Answer

The remote peer closed the connection. A BGP Cease notification indicates that the remote peer has closed the BGP session, often due to an administrative shutdown, configuration change, or error condition on the peer. The 'BGP recv Notification' message means the local router received this notification from the peer, so the remote peer initiated the closure.

Answer

The BGP table is full

Answer

The hold timer expired

Answer

The interface went down

Question 3

An engineer is troubleshooting a connectivity issue and wants to see real-time interface traffic statistics. Which command provides continuous updates?

Accepted Answer

monitor interface traffic. The `monitor interface traffic` command in Junos OS provides a real-time, continuously updating display of interface traffic statistics, making it the correct choice for live monitoring. Unlike static commands that show a single snapshot, this command refreshes the output at a default interval (typically 1 second) until the user interrupts it with Ctrl+C.

Answer

show interface statistics

Answer

monitor start messages

Answer

show interfaces extensive

Question 4

A junior engineer is troubleshooting a routing issue and wants to see the route table for IPv4 unicast routes. Which command will display this information?

Accepted Answer

show route table inet.0. The command 'show route table inet.0' displays the IPv4 unicast route table in Junos. The inet.0 table is the default routing table for IPv4 unicast routes, containing all active routes learned via various protocols (e.g., OSPF, BGP, static). This command is the standard way to view the IPv4 unicast routing information base (RIB) on Juniper devices.

Answer

show route table inet6.0

Answer

show route forwarding-table

Answer

show route protocol bgp

Question 5

Refer to the exhibit. What does this output indicate?

Accepted Answer

The candidate configuration differs from the active configuration.. The output shows the 'show | compare' command, which displays the differences between the candidate configuration and the active (committed) configuration. The presence of lines prefixed with '+' (additions) and '-' (deletions) indicates that the candidate configuration is not identical to the active configuration, confirming that they differ.

Answer

There is a syntax error.

Answer

The commit succeeded.

Answer

The configuration is identical.

Question 6

A junior engineer is tasked with configuring a firewall filter to only allow SSH access to the management interface. The management interface is fxp0. Which configuration is correct?

Accepted Answer

set interfaces fxp0 unit 0 family inet filter input allow-ssh. The management interface on Juniper devices is fxp0, and applying a firewall filter to its inet family input direction restricts inbound traffic. The filter 'allow-ssh' must permit only TCP port 22, blocking all other management access. This configuration ensures SSH-only access to the management interface.

Answer

set interfaces lo0 unit 0 family inet filter input allow-ssh

Answer

set groups management-filter interfaces fxp0 unit 0 family inet filter input allow-ssh

Answer

set interfaces ge-0/0/0 unit 0 family inet filter input allow-ssh

Question 7

Refer to the exhibit. The router has three static routes configured. Which route will be used to forward a packet destined to 172.16.1.100?

Accepted Answer

The static route to 172.16.0.0/16. The router will use the most specific matching route for the destination 172.16.1.100. The static route to 172.16.0.0/16 has a prefix length of 16, which is more specific than the default route (0.0.0.0/0) and the route to 10.0.0.0/8 (which does not match the destination). Therefore, the route to 172.16.0.0/16 is selected based on the longest-prefix-match rule.

Answer

The default route (0.0.0.0/0)

Answer

The router will drop the packet.

Answer

The static route to 10.0.0.0/8

Question 8

When configuring OSPF on a Juniper router, an engineer applies the 'area 0.0.0.0 interface ge-0/0/1.0 passive' command. What is the effect of this configuration?

Accepted Answer

The interface will not send OSPF hellos, but the connected network will still be advertised in OSPF.. The 'passive' configuration on an OSPF interface in Junos prevents the interface from sending OSPF Hello packets, which stops the formation of neighbor adjacencies. However, the interface's connected network prefix is still advertised as a stub network in OSPF Type 1 LSAs, ensuring reachability to that subnet without dynamic neighbor relationships.

Answer

The interface will not be advertised in OSPF at all, and no OSPF traffic will be transmitted.

Answer

The interface will only accept incoming OSPF packets but will not send any.

Answer

The interface will actively send OSPF hellos and attempt to form adjacencies.

Question 9

Refer to the exhibit. An engineer has made changes to the candidate configuration. What will happen when the engineer issues the 'commit' command?

Accepted Answer

Both the interface address and security policy will be activated.. In Junos, the 'commit' command activates all changes in the candidate configuration atomically. Both the interface address change and the security policy will be applied simultaneously after validation. Junos does not require a reboot for security policy changes, and syntax errors cause the commit to fail, not be ignored.

Answer

The commit will succeed but the security policy will be ignored due to a syntax error.

Answer

Only the interface address change will be committed because security policies require a reboot.

Answer

The configuration will be validated; if errors exist, the commit will fail.

Question 10

An administrator suspects that an interface is flapping but the router is remote and the connection is intermittent. The administrator wants to monitor the interface status without maintaining an SSH session. Which approach should be used?

Accepted Answer

Configure event-options to trigger on interface down and send syslog. Junos event-options allows you to define an event policy that triggers on a specific event, such as an interface down transition, and then executes an action like sending a syslog message. This enables asynchronous monitoring without requiring an active SSH session, making it ideal for intermittent connectivity scenarios.

Answer

Use 'monitor interface ge-0/0/0' and rely on terminal persistence

Answer

Use 'monitor start' to capture logs

Answer

Schedule a cron job to run 'show interfaces ge-0/0/0' every minute and log output