JN0-106 User Interfaces Practice Test 2 — 15 Questions

Question 1

Which TWO statements correctly describe the behavior of the Junos CLI operational mode?

Accepted Answer

Commands such as show and ping are available.. Junos CLI operational mode provides commands for monitoring, troubleshooting, and verifying the device state, such as 'show' for displaying configuration and operational data, and 'ping' for network connectivity tests. These commands do not alter the active configuration, which is the defining characteristic of operational mode.

Answer

Command options are enclosed in curly braces { }.

Answer

Commands must be entered in full; abbreviation is not allowed.

Answer

You can commit configuration changes directly.

Question 2

Refer to the exhibit. An engineer configures a new IPv6 address on ge-0/0/0 unit 0 by entering the following commands in configuration mode:

set interfaces ge-0/0/0 unit 0 family inet6 address 2001:db8::2/64
commit

After the commit, the engineer runs 'show interfaces terse ge-0/0/0' and sees only the two original addresses. What is the most likely cause?

Accepted Answer

The engineer did not enter configuration mode before running the 'set' command.. The engineer likely ran the 'set' command from operational mode (e.g., at the '>' prompt) rather than from configuration mode (e.g., at the '#' prompt). In Junos, 'set' commands only take effect when entered in configuration mode; if entered in operational mode, they are silently ignored or produce an error, and the configuration is not modified. Since the engineer saw no new address after commit, the 'set' command was never applied to the candidate configuration.

Answer

The engineer used 'commit' instead of 'commit confirmed'.

Answer

Junos only allows one IPv6 address per interface.

Answer

The 'set' command requires the 'add' keyword to add a second address.

Question 3

Arrange the steps to configure a static route in Junos OS in the correct order.

Accepted Answer

Enter configuration mode, then set the static route under routing-options static, then commit the configuration, then verify the route with show route.. Static routes are configured under 'routing-options static' in Junos. After setting the route, you must commit and verify.

Answer

Enter configuration mode, then commit the configuration, then set the static route under routing-options static, then verify the route with show route.

Answer

Set the static route under routing-options static, then enter configuration mode, then commit the configuration, then verify the route with show route.

Answer

Enter configuration mode, then set the static route under routing-options static, then verify the route with show route, then commit the configuration.

Question 4

Arrange the steps to perform a system backup (snapshot) on a Junos device.

Accepted Answer

Step 1: Connect to the device. Step 2: Enter operational mode. Step 3: Execute 'request system snapshot'. Step 4: Confirm the operation by typing 'yes'.. Snapshot creates a bootable backup of the Junos system. The steps are straightforward.

Answer

Step 1: Connect to the device. Step 2: Execute 'request system snapshot'. Step 3: Enter operational mode. Step 4: Confirm the operation.

Answer

Step 1: Execute 'request system snapshot'. Step 2: Connect to the device. Step 3: Enter operational mode. Step 4: Confirm the operation.

Answer

Step 1: Enter operational mode. Step 2: Execute 'request system snapshot'. Step 3: Confirm the operation. Step 4: Connect to the device.

Question 5

Match each Junos CLI operational mode command to its function.

Accepted Answer

show interface terse: Displays summary information about all interfaces. These are common operational mode commands used for monitoring and troubleshooting in Junos.

Answer

show interface terse: Displays detailed interface statistics

Answer

show route: Displays the configuration of routing protocols

Question 6

Match each Junos interface type to its typical use.

Accepted Answer

ge: used for LAN access. Junos interface type abbreviations indicate speed and purpose: ge (Gigabit Ethernet) for LAN access, xe (10 Gigabit Ethernet) for high-speed uplinks, lo (loopback) for router ID and management, and et (40/100 Gigabit Ethernet) for data center interconnects. Common confusions include associating ge with uplinks or lo with physical interconnections.

Answer

ge: used for high-speed uplinks

Answer

lo: used for data center interconnection

Question 7

A network administrator wants to quickly review only the parts of the Junos configuration that differ from the factory defaults, to identify custom settings. Which command is most appropriate?

Accepted Answer

show configuration | display omit. The 'display omit' pipe modifier filters out configuration statements that match the factory-default values, showing only the lines that differ from the defaults. This allows the administrator to quickly review custom settings without manually comparing against a baseline.

Answer

show configuration | no-more

Answer

show configuration

Answer

show | compare

Question 8

A technician is troubleshooting a routing issue and needs to see real-time updates of BGP prefixes being received. Which command should be used?

Accepted Answer

monitor route bgp. The 'monitor route bgp' command in Junos OS provides a real-time, continuously updated view of BGP routes as they are learned or withdrawn. Unlike static show commands, this monitor command refreshes the output dynamically, making it ideal for observing live BGP prefix updates during troubleshooting.

Answer

monitor traffic interface ge-0/0/0

Answer

show route advertising-protocol bgp

Answer

show route protocol bgp

Question 9

During a maintenance window, an engineer needs to apply a configuration change that reverts automatically if the commit fails or the administrator does not confirm within a set time. Which feature should be used?

Accepted Answer

commit confirmed. The 'commit confirmed' feature allows an engineer to apply a configuration change that automatically reverts to the previous configuration if the commit is not confirmed within a specified time period (default 10 minutes). This ensures that if the commit fails or the administrator loses connectivity, the system rolls back safely without manual intervention.

Answer

commit check

Answer

commit synchronize

Answer

commit at 03:00

Question 10

A junior admin wants to see all commands available in operational mode that start with 'show'. What keystrokes should they use?

Accepted Answer

show ?. In Junos operational mode, typing 'show ?' and pressing Enter (or just 'show ?' without Enter) displays all commands that start with 'show'. The question mark (?) is the context-sensitive help key that lists available completions for the current partial command. Pressing Enter after 'show ?' is optional but acceptable; the key behavior is the space followed by ?.

Answer

show ? + Enter

Answer

show + ?

Answer

show <Tab>

Question 11

An engineer is configuring a firewall filter and wants to verify the syntax of the configuration before committing. Which command should be used?

Accepted Answer

commit check. The 'commit check' command validates the syntax and configuration semantics of the candidate configuration without activating it. This allows the engineer to verify that the firewall filter configuration is correct before committing, preventing potential service disruption from a faulty commit.

Answer

validate

Answer

show | display inheritance

Answer

commit confirmed

Question 12

After upgrading Junos, a router fails to boot with a file system error. The admin needs to recover the system from the backup partition. Which key should be pressed during boot to access the boot menu?

Accepted Answer

Space. Pressing the Space bar during the boot process on a Juniper device interrupts the normal boot sequence and presents the boot menu. From this menu, the administrator can select the backup Junos partition (typically labeled as '1' or 'backup') to recover the system when the primary partition has a file system error.

Answer

Ctrl+C

Answer

Esc

Answer

Enter

Question 13

A user wants to ensure that a configuration change is applied across both Routing Engines in a dual-RE system. Which command must be used?

Accepted Answer

commit synchronize. The 'commit synchronize' command applies the candidate configuration to both Routing Engines simultaneously in a dual-RE system. This ensures configuration consistency across the master and backup RE, which is critical for high availability and seamless failover in Junos.

Answer

commit and-quit

Answer

commit confirmed

Answer

commit full

Question 14

An administrator needs to see which interfaces are configured and their current operational status in a concise format. Which command provides this information?

Accepted Answer

show interfaces terse. The 'show interfaces terse' command displays a concise, table-like output listing all interfaces (including logical units) along with their administrative status (up/down) and operational status (up/down). This is the most efficient way to see both configured interfaces and their current state in a compact format, as required by the question.

Answer

show interfaces

Answer

show configuration interfaces

Answer

show interfaces descriptions

Question 15

A network operator is using the 'monitor traffic' command but wants to stop after capturing 100 packets. Which option should be added?

Accepted Answer

limit 100. The 'monitor traffic' command in Junos captures packets for analysis. To stop the capture after a specific number of packets, the correct option is 'limit 100', which instructs the command to terminate after processing 100 packets. This is a Junos-specific parameter for controlling the capture duration.

Answer

size 100

Answer

packets 100

Answer

count 100