JN0-106 Practice Test 22 — 15 Questions

Question 1

Refer to the exhibit. How many next hops are installed for the 10.1.1.0/24 route?

Accepted Answer

2. The route 10.1.1.0/24 has two next hops installed because the routing table shows two distinct next-hop addresses (e.g., 192.168.1.1 and 192.168.2.1) under the same route entry. In JUNOS, when equal-cost paths exist, the route is installed with multiple next hops, and the count reflects the number of unique next-hop entries, not the number of interfaces or paths in a load-balancing set.

Answer

4

Answer

3

Answer

1

Question 2

You are managing a Juniper EX4300 switch that serves as a Layer 3 access switch for a campus network. The switch has multiple VLANs configured with IRB interfaces. Users in VLAN 10 report that they cannot reach the default gateway (IRB.10) even though other VLANs are working fine. You check the configuration and see that interface irb.10 is configured with an IP address. You also verify that the VLAN is associated with the correct access ports. However, when you ping the IRB.10 address from the switch itself, it fails. You suspect that the issue might be that the IRB interface is not 'up'. Which command would you use to quickly verify the operational status of the IRB interface?

Accepted Answer

show interfaces terse irb.10. `show interfaces terse irb.10` displays the operational status (up/down) of the IRB interface along with its configured IP address. Since the issue is that the IRB interface may not be 'up', this command quickly confirms whether the interface is operationally active, which is essential for Layer 3 forwarding.

Answer

show ethernet-switching table

Answer

show configuration interfaces irb.10

Answer

show vlan

Question 3

Which THREE statements about the commit operation are correct? (Choose three.)

Accepted Answer

The 'commit check' command validates the syntax of the candidate configuration without activating it.. Option A is correct because 'commit check' performs a syntax and semantic validation of the candidate configuration and reports errors without activating or applying it, leaving the active configuration unchanged. Option B is correct because a successful commit copies the candidate configuration into the active configuration (the running configuration that the device uses), making the candidate the active one. Option C is correct because a commit can be issued with a confirmation timeout (for example, 'commit confirmed 10'), which automatically reverts to the previous configuration unless the commit is confirmed within that period. Option D is not correct because the active configuration is stored in 'juniper.conf' (with backups like juniper.conf.1.gz), while the candidate configuration is held in a separate candidate database, not in 'juniper.conf'. Option E is not correct because the rescue configuration is not saved automatically by a commit; it must be saved explicitly with 'request system configuration rescue save'.

Answer

The candidate configuration is stored in a file named 'juniper.conf' on the flash drive.

Answer

A commit operation automatically saves the rescue configuration.

Question 4

Which three steps are part of a typical software upgrade process on a Juniper device? (Choose three.)

Accepted Answer

Issue the request system software add command. Option A is correct because the request system software add command is the standard Junos CLI command used to install a new software image onto the device, validating and unpacking it into the alternate partition. Option B is correct because the software image must first be downloaded to the device, and /var/tmp is the conventional directory used for staging the Junos package before installation. Option E is correct because after the new image is added, the device must be rebooted so it boots from the newly installed software on the alternate partition. Option C is not part of the process because interfaces do not need to be manually shut down; the reboot handles the transition. Option D is not required because Junos installs the new image to the alternate partition and the old image can remain, so deleting it beforehand is unnecessary and not a standard step.

Answer

Shut down all interfaces

Answer

Delete the old image before adding the new one

Question 5

Which TWO statements about the 'commit' operation in Junos are correct?

Accepted Answer

The commit operation validates syntax before applying, and if errors are found, the commit fails.. Option A is correct because when you run commit, Junos first performs a syntax check on the candidate configuration, and if any syntax errors are detected, the commit fails and the candidate configuration is not activated. Option E is correct because the commit operation merges the candidate configuration into the active configuration, making it the new running (active) configuration on the device. Option B is incorrect because automatic rollback after 10 minutes only occurs with the 'commit confirmed' command, not a standard commit. Option C is incorrect because Junos commits the entire candidate configuration; partial commits are not supported (you would use configuration groups or 'commit check' for validation instead). Option D is incorrect because commit applies changes immediately, not at the next system reboot.

Answer

The commit operation automatically rolls back changes after 10 minutes if not confirmed.

Answer

The commit operation allows you to commit only a specific portion of the configuration.

Answer

The commit operation applies the configuration changes at the next system reboot.

Question 6

Which TWO statements are true about the 'commit' operation in Junos?

Accepted Answer

The commit command validates the configuration syntax before applying it.. Option A is correct because when you issue commit in Junos, the candidate configuration is first checked for syntax and semantic errors, and only a valid configuration is merged into the active configuration. Option D is correct because Junos supports commit comment "text", which stores a descriptive comment with the committed configuration for documentation and audit purposes. Option B is not correct because commit applies the candidate configuration to the active configuration; it does not by itself save a configuration file to disk, which is done with save or file-related commands. Option C is not correct because after a commit the candidate configuration remains as the working copy and is not replaced by the active configuration. Option E is not correct because a successful commit does not overwrite the rollback configurations; Junos maintains up to 50 previous committed configurations for rollback.

Answer

The commit command automatically saves the configuration to a file on the hard disk.

Answer

After a commit, the candidate configuration is replaced with the active configuration.

Answer

A successful commit overwrites the rollback configurations.

Question 7

Which TWO statements are true about the Junos configuration hierarchy?

Accepted Answer

The configuration is divided into a hierarchical tree.. Option B is correct because the Junos configuration is fundamentally a hierarchical tree of statements, organized under top-level stanzas such as system, interfaces, protocols, and routing-options, which can be nested to arbitrary depth. Option C is correct because in Junos configuration syntax every configuration statement must be terminated by a semicolon, for example 'set system host-name router1' or 'host-name router1;' in curly-brace format. Option A is incorrect because system and interfaces are just two of many top-level hierarchies, not the only two main hierarchies. Option D is incorrect because Junos allows statements to be entered in any order; the commit process validates and orders the configuration logically. Option E is incorrect because the Junos configuration is explicitly hierarchical, not flat, and statements are grouped into nested hierarchies.

Answer

Configuration is organized into two main hierarchies: system and interfaces.

Answer

Configuration must be entered in a specific order.

Answer

It is a flat structure with no grouping.

Question 8

Which THREE operational commands are used to monitor interface statistics and status? (Select three.)

Accepted Answer

show interfaces terse. Option A, "show interfaces terse," is correct because it provides a compact, one-line-per-interface summary of operational status (up/down), protocol state, and basic counters, making it ideal for quickly monitoring interface status. Option B, "monitor interface," is correct because it displays real-time, continuously updating interface statistics and status, which is specifically designed for live monitoring of interface traffic and errors. Option C, "show interfaces," is correct because it gives detailed operational output including status, protocol state, error counters, and statistics for each interface, serving as a primary monitoring command. Option D, "show log interfaces," is not a valid operational command for monitoring interface statistics and status; logs are viewed with commands like "show log messages." Option E, "show interfaces diagnostics," is not a standard command for monitoring interface statistics and status; diagnostics commands typically display optics or hardware diagnostic information rather than general interface status and counters.

Answer

show log interfaces

Answer

show interfaces diagnostics

Question 9

Which TWO commands are used to install and remove software packages on a Junos device?

Accepted Answer

request system software delete. Option A, `request system software delete`, is correct because it is the Junos operational-mode command used to remove an installed software package (such as a Junos image or an individual package) from the device. Option E, `request system software add`, is correct because it is the Junos command used to install a new software package or Junos image onto the device, typically referencing a local file or URL. Option B, `request system software rollback`, is incorrect because it reverts the system to a previously installed software version rather than installing or removing a package. Option C, `show system software`, is incorrect because it only displays information about installed software and does not modify it. Option D, `request system reboot`, is incorrect because it restarts the device and does not install or remove any software package.

Answer

request system software rollback

Answer

show system software

Answer

request system reboot

Question 10

Which TWO methods can be used to restore a previous configuration on a Juniper device? (Select two.)

Accepted Answer

load override /config/rescue.conf. Option A, `load override /config/rescue.conf`, is correct because the rescue configuration is a saved, known-good configuration file that can be loaded with the `load override` command to replace the entire current candidate configuration, after which a `commit` restores the device to that prior state. Option C, `rollback 1`, is correct because Junos retains the last 49 committed configurations, and `rollback 1` loads the immediately previous committed configuration into the candidate, which can then be committed to restore the earlier configuration. Option B, `commit confirmed`, is not a restore method; it activates a configuration temporarily and auto-rolls back unless confirmed, so it is used for safe changes, not for restoring a previous config. Option D, `load replace previous`, is invalid syntax—`load replace` requires a specific file or terminal input, and there is no `previous` keyword for it. Option E, `rollback 0`, loads the currently active (most recent) committed configuration, so it does not restore an earlier configuration.

Answer

commit confirmed

Answer

load replace previous

Answer

rollback 0

Question 11

A junior administrator is learning to navigate the Junos CLI. Which three statements about CLI modes are correct? (Choose three.)

Accepted Answer

Operational mode is indicated by a > prompt.. Option A is correct because Junos operational mode is indeed identified by the '>' prompt (e.g., user@host>), which is where monitoring and show commands are executed. Option B is correct because the 'configure' command is the standard way to enter configuration mode from operational mode, changing the prompt to '#' (e.g., user@host#). Option E is correct because from configuration mode you can run operational commands by prefixing them with 'run', such as 'run show interfaces', without leaving configuration mode. Option C is incorrect because 'commit' is only available in configuration mode, not operational mode. Option D is incorrect because the proper way to return to operational mode is the 'exit' command (or 'exit configuration-mode' in some contexts), not 'exit configuration'.

Answer

The 'commit' command is available in both operational and configuration modes.

Answer

You can switch from configuration mode to operational mode using the 'exit configuration' command.

Question 12

Which THREE commands are valid in Junos operational mode? (Choose three.)

Accepted Answer

show interfaces terse. Option A, 'show interfaces terse', is valid in Junos operational mode because show commands are operational-mode commands used to display interface status and configuration summaries. Option D, 'ping 10.0.0.1 count 5', is valid in operational mode because ping is an operational-mode diagnostic command, and 'count 5' correctly limits the number of ICMP echo requests. Option E, 'request system software add /var/tmp/junos-install.tgz', is valid in operational mode because request commands are operational-mode commands used to perform system actions such as installing a Junos software package. Option B, 'set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24', is a configuration-mode command and is not valid in operational mode. Option C, 'commit and-quit', is also a configuration-mode command used to commit candidate configuration changes and exit configuration mode, so it is not valid in operational mode.

Answer

set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24

Answer

commit and-quit

Question 13

Which TWO statements are true regarding Junos configuration groups?

Accepted Answer

Configuration groups are applied using the apply-groups statement.. Option B is correct because configuration groups in Junos are explicitly attached to the configuration hierarchy using the apply-groups statement (for example, set interfaces ge-0/0/0 apply-groups GROUP-NAME), which is the mechanism that injects the group's statements into the active configuration. Option E is correct because when multiple groups are referenced in an apply-groups statement, Junos processes them in the order listed, with later groups taking precedence over earlier ones, and the explicit configuration taking precedence over all applied groups. Option A is wrong because group settings can override existing settings depending on inheritance and precedence rules. Option C is wrong because configuration groups can contain almost any configuration stanza, not just interfaces. Option D is wrong because groups are not applied automatically to all hierarchies; they must be explicitly referenced with apply-groups at the desired hierarchy level.

Answer

Configuration groups never override existing settings.

Answer

Configuration groups are only useful for interface configuration.

Answer

Configuration groups are applied automatically to all hierarchies.

Question 14

An engineer needs to view the current operational state of the device, including system uptime, CPU load, and memory usage. Which two commands would provide this information? (Choose two.)

Accepted Answer

show system uptime. Option B, 'show system uptime,' is correct because on Junos devices this command reports the current time, how long the device has been running (system uptime), and the load averages for 1, 5, and 15 minutes, directly satisfying the uptime and CPU load requirements. Option D, 'show system memory,' is correct because it displays memory utilization statistics, including total, used, and free memory, which fulfills the memory usage portion of the request. Option A, 'show system processes,' lists running processes and their CPU/memory consumption per process rather than the overall system uptime and aggregate load, so it does not match the scenario as directly. Option C, 'show system storage,' reports disk and filesystem space usage, not CPU load or memory, and Option E, 'show chassis hardware,' displays hardware inventory and component information, neither of which provides the requested operational state.

Answer

show system processes

Answer

show system storage

Answer

show chassis hardware

Question 15

Which THREE pipe modifiers can be used to filter command output? (Choose three.)

Accepted Answer

count. In network CLI environments such as Junos, the pipe modifier 'count' (option B) filters command output by returning only the number of lines the preceding command produces, which is a valid way to filter/summarize output. The 'match' modifier (option D) filters output by displaying only lines that match a given regular expression, directly narrowing the returned text. The 'except' modifier (option E) filters output by excluding lines that match a specified pattern, the inverse of match, and is likewise a legitimate output filter. The unmarked options do not belong: 'no-more' (option A) is a terminal display control that disables paging, not a filter, and 'display set' (option C) is a configuration display format command, not a pipe modifier for filtering output.

Answer

no-more

Answer

display set