Juniper JN0-105 Exam Questions
Questions for the JN0-105 were updated on : Dec 01 ,2025
Page 1 out of 7. Viewing questions 1-15 out of 100
Question 1
Which prompt indicates that you are using configuration mode?
- A. >
- B. $
- C. #
- D. %
Answer:
C
Explanation:
In Junos OS, the # prompt indicates that you are in configuration mode. This mode is used for making
changes to the configuration of the device.
Reference: Juniper Networks CLI Modes
"The # prompt indicates that you are in configuration mode."
Question 2
You are asked to configure your device running Junos OS to automatically archive your configuration
upon commit
In this scenario, which two methods are supported by the Junos OS? (Choose two)
- A. SCP
- B. RCP
- C. FTP
- D. HTTP
Answer:
A, B
Explanation:
Junos OS supports multiple methods for automatically archiving configurations upon commit. Two of
the supported methods are SCP (Secure Copy Protocol) and RCP (Remote Copy Protocol). These
methods can be configured to save the configuration files to a remote server automatically whenever
a commit is made.
Reference: Juniper Networks Documentation on Configuration Archival
"You can configure Junos OS to automatically archive the configuration using protocols such as SCP
and RCP upon commit."
Question 3
Which command modifier would you use to see all possible completions for a specific command?
- A. |
- B. detail
- C. ?
- D. extensive
Answer:
C
Explanation:
In Junos OS, the ? command modifier is used to display all possible completions for a specific
command. This helps users understand the available options and syntax for a command they are
trying to use.
Reference: Juniper Networks CLI Documentation
"Use the ? command modifier to display all possible completions for a specific command."
Question 4
Which character is used to filter the command output in the Junos CLI?
- A. |
- B. >
- C. <
- D. ?
Answer:
A
Explanation:
In the Junos CLI, the pipe character | is used as a filter operator to refine command output. This
operator can be combined with various filtering commands like match, except, count, etc., to display
only the relevant portions of the command output. For example, using | match <pattern> filters the
output to show only the lines that contain the specified pattern, making it easier to find specific
information within extensive command output. This functionality is especially useful in managing
and troubleshooting complex configurations and network states, allowing for more efficient analysis
of the device's operational status and configuration details.
Question 5
Which two statements are correct about Junos traceoptions? (Choose two.)
- A. Traceoptions cannot be enabled in a production environment.
- B. Traceoptions are enabled through configuration.
- C. Traceoptions are enabled by default.
- D. Traceoption output, by default, is stored in /var/iog/<fiie-name>.
Answer:
B, D
Explanation:
Traceoptions in Junos OS are used for detailed debugging and troubleshooting of protocols and
processes within the system. They are not enabled by default due to the potential performance
impact and volume of data generated. Instead, traceoptions are enabled through specific
configuration settings under the relevant protocol or process hierarchy. This allows administrators to
target their troubleshooting efforts and control the scope of logging. By default, the output
generated by traceoptions is stored in files located in the /var/log directory, with the file name
typically specified in the traceoptions configuration. This structured approach to logging and
debugging helps in diagnosing complex issues without overwhelming the system or the
administrator with irrelevant data.
Question 6
You have completed the initial configuration of your new Junos device. You want to be able to load
this configuration at a later time.
Which action enables you to perform this task?
- A. Enter the load factory-default command.
- B. Enter the request system reboot command.
- C. Enter the request system zeroize command.
- D. Enter the request system configuration rescue save command.
Answer:
D
Explanation:
In Junos OS, the request system configuration rescue save command is used to save the current
active configuration as a rescue configuration. This feature is particularly useful for preserving a
known good configuration state that can be quickly reverted to in case of configuration errors or
issues. By saving a rescue configuration, administrators can ensure that they have a reliable fallback
option that can be loaded in the future to restore the device's operation without having to
reconfigure from scratch. This is an essential practice for maintaining network stability and quick
recovery.
Question 7
Click the Exhibit button.
Referring to the exhibit, what should be configured on R1 to advertise a default static route into
OSPF?
- A. a firewall filter
- B. a routing policy
- C. a loopback interface
- D. a management interface
Answer:
B
Explanation:
To advertise a default static route into OSPF on router R1, a routing policy should be configured. This
policy would typically include a statement to match the default route (0.0.0.0/0) and then apply an
action to set the route as an OSPF external type, which would then be redistributed into the OSPF
domain. The routing policy is a set of conditions and actions that determine how routes are imported
into or exported from the routing table and how routes are shared between routing instances or
routing protocols. After defining the policy, it must be applied to OSPF under the export section of
the OSPF configuration on R1. This process will allow R1 to announce the default route to other OSPF
routers in the network, which then can use it as a gateway of last resort to reach the Internet or
other networks not explicitly known to the OSPF domain.
Question 8
You received a new Junos device and are configuring the system-related settings. You must configure
this device for the current date and time on the US West coast. You have set the time zone to
America/Los_Angeies. however the time and date did not change.
In this scenario, which two additional actions would satisfy this requirement? (Choose two.)
- A. Set the date and time setting manually.
- B. Configure an NTP server.
- C. Configure a DNS server.
- D. Reboot the device.
Answer:
A, B
Explanation:
When configuring the system-related settings for the current date and time on a Junos device,
especially for a specific time zone like America/Los_Angeles, and the time does not automatically
adjust, two effective actions can be taken. Firstly, setting the date and time manually allows for
immediate correction of the system clock. This can be done via the CLI with the appropriate set date
and time command. Secondly, configuring the device to use an NTP server can provide ongoing
synchronization with an accurate time source, ensuring that the device maintains the correct time
and date automatically in the future, even in the case of restarts or minor drifts in the internal clock.
Question 9
Which protocol would you configure to synchronize the time and date on a Junos device?
- A. SNMP
- B. RIP
- C. NTP
- D. NMP
Answer:
C
Explanation:
The Network Time Protocol (NTP) is designed to synchronize the clocks of computers over a network.
Configuring NTP on a Junos device ensures that its clock is set accurately, which is crucial for logging,
troubleshooting, and maintaining the integrity of time-sensitive operations and security protocols.
NTP allows devices to use a hierarchy of time sources, from primary servers synchronized to a
reference clock (such as an atomic clock or GPS time) to secondary servers that distribute the time to
other devices on the network.
Question 10
In the Junos OS, which keyboard shortcut allows you to move to the start of the line?
- A. Ctrl+a
- B. Ctrl+e
- C. Ctrl+w
- D. Ctrl+k
Answer:
A
Explanation:
In the Junos OS command-line interface (CLI), the keyboard shortcut Ctrl+a is used to move the
cursor to the start of the line. This is a common convention in many command-line environments and
text editors, providing a quick way to navigate to the beginning of the current command or line of
text without having to use the arrow keys. This can be particularly useful for making quick edits to
commands or for navigating long lines of text more efficiently.
Question 11
Click the Exhibit button.
Referring to the exhibit, OSPF has three export policies that match different static route prefixes. The
10.10.10.0/24 static route does not match any terms in the policyl routing policy.
What happens next in this scenario?
- A. The static route is evaluated by the poiicy3 routing policy.
- B. The static route is evaluated by the poiicy2 routing policy.
- C. The static route is rejected by the default routing policy.
- D. The static route is rejected by the policyl routing policy.
Answer:
B
Explanation:
In Junos, when multiple policies are applied to a routing protocol for route export, the routes are
evaluated in the order in which the policies are listed. In the exhibit, the OSPF configuration has
three export policies listed: policy1, policy2, and policy3. The static route 10.10.10.0/24 does not
match any terms in policy1; therefore, it is not rejected by policy1 but is instead passed on to the
next policy in the sequence, which is policy2.
If the static route matches a term in policy2 that permits the route, it will be exported into OSPF. If it
does not match in policy2, it will then be evaluated by policy3. If there is no match in policy3 as well,
and assuming there are no more policies listed, the route would then be subject to the default
routing policy behavior, which typically rejects the route unless an explicit accept statement is
present in the policies.
Question 12
Which two statements about route preference in Junos are correct? (Choose two.)
- A. Both direct and static routes have the same preference.
- B. Both direct and local routes have the same preference.
- C. Both OSPF internal and OSPF AS external routes have the same preference.
- D. Both EBGP and IBGP routes have the same preference.
Answer:
B, C
Explanation:
In Junos OS, route preference (also known as administrative distance) is used to determine the
preferred route among multiple routes to the same destination learned via different routing
protocols. Direct and local routes, which represent directly connected networks and interfaces,
typically share the same low preference value, indicating high trustworthiness because they are
directly connected to the router. OSPF internal routes (routes within the same OSPF area) and OSPF
AS external routes (routes that are external to the OSPF autonomous system but redistributed into
OSPF) also share the same preference value, although this value is higher (indicating less trust) than
for direct and local routes. This distinction helps the routing engine decide which routes to use when
multiple paths are available.
Question 13
Which two statements are true about the candidate configuration? (Choose two.)
- A. Candidate configuration changes are automatically applied.
- B. You can deploy multiple changes at the same time.
- C. Multiple users cannot modify the same candidate configuration.
- D. You can discard changes before committing them.
Answer:
B, D
Explanation:
The candidate configuration in Junos OS is a temporary configuration that allows network
administrators to make and stage multiple configuration changes before applying them to the device.
This approach enables the deployment of multiple changes in a single operation, ensuring that all
configurations work together as intended before making them active. Additionally, the candidate
configuration can be discarded if the administrator decides not to apply the staged changes, allowing
for a "trial and error" approach without affecting the currently active configuration. This feature
provides flexibility and reduces the risk of disruptive changes to the network.
Question 14
Which two statements describe the result when you enter? at the command-line prompt? (Choose
two.)
- A. It lists the available commands and options.
- B. It lists tips for the help menu.
- C. It displays help about a text string contained in a statement.
- D. It displays summary information about the commands and options.
Answer:
A, D
Explanation:
When you enter ? at the command-line prompt in Junos OS, the system provides assistance in two
significant ways. Firstly, it lists the available commands and options that can be used at the current
point in the command hierarchy, aiding users in understanding what commands they can execute
next. Secondly, it displays summary information about those commands and options, providing brief
descriptions or additional context that can help users understand the function of each command or
option. This feature is particularly useful for learning the command structure or for quick reference
when specific command syntax is forgotten.
Question 15
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
- A. logged and discarded
- B. logged and rejected
- C. logged with no further action
- D. logged and accepted
Answer:
D
Explanation:
The firewall filter configuration in the exhibit specifies a filter with two terms. Term 1 matches traffic
from the source address 10.0.0.0/8 and has two actions: 'log' and 'next term'. The 'log' action will
record the match to a log file, and 'next term' indicates that the firewall should evaluate the next
term after logging. There is no explicit action such as 'accept' or 'reject' in term 1, so by default, the
traffic will be accepted unless subsequently rejected by another term.
Term 2 has the action 'reject', which discards packets that reach this term. Since there is no 'from'
condition in term 2, it acts as a default rule for all traffic not matched by term 1.
Because the traffic sourced from 10.0.0.0/8 matches term 1 and there is no reject action in that term,
it will be logged and then accepted by the firewall filter. There is no subsequent term that rejects this
specific traffic, so the action from term 2 does not apply to it.