[Sep 27, 2025] Juniper JN0-105 Real Exam Questions and Answers FREE

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NEW QUESTION # 28
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 request system reboot command.
• B. Enter the request system zeroize command.
• C. Enter the load factory-default 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.

NEW QUESTION # 29
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.

NEW QUESTION # 30
You have logged on to a Junos device and are at the operational mode prompt.
Which two commands are used at this prompt? (Choose two.)

• A. run show interface terse
• B. request system shutdown
• C. set interface ge-0/0/0 unit 0 family inet
• D. show interface ge-0/0/0

Answer: D

Explanation:
At the operational mode prompt on a Junos device, you can use various commands to view the device's status and request system operations. Theshow interface ge-0/0/0command is used to display information about a specific interface, while therequest system shutdowncommand is used to properly shut down the device. The setcommand is used in configuration mode, not operational mode, and theruncommand is used to execute operational mode commands from configuration mode.

NEW QUESTION # 31
Which two statements apply to the Routing Engine functions? (Choose two.)

• A. It processes the transit traffic.
• B. It responds to ping and traceroute commands.
• C. It does not process routing updates.
• D. It maintains the routing tables.

Answer: B,D

Explanation:
The Routing Engine (RE) in Juniper Networks devices plays a critical role in the control plane operations. One of its functions includes responding to network utility commands like ping and traceroute, which are essential for diagnosing network connectivity and path issues. Furthermore, the RE is responsible for maintaining the routing tables, which contain information about network paths and destinations. These tables are vital for making forwarding decisions but are distinct from the actual forwarding of packets, which is handled by the Packet Forwarding Engine (PFE).

NEW QUESTION # 32
What is the protocol data unit (PDU) of the Data Link Layer?

• A. bit
• B. frame
• C. byte
• D. segment

Answer: B

Explanation:
In the OSI model, the Data Link Layer is responsible for node-to-node delivery of data. It frames the packets received from the Network Layer and prepares them for physical transmission. The Protocol Data Unit (PDU) for the Data Link Layer is called a "frame." Frames encapsulate the network layer packets, adding a header and a trailer that include the hardware addresses of the source and destination, among other things, facilitating the data link layer services like frame synchronization, flow control, and error checking.

NEW QUESTION # 33
What will the request system configuration rescue save command do?

• A. It saves the most recently committed configuration as the rescue configuration.
• B. It saves a configuration version prior to the configuration most recently committed as the rescue configuration.
• C. It activates the rescue configuration.
• D. It saves the candidate configuration as the rescue configuration.

Answer: A

Explanation:
The request system configuration rescue save command in Junos OS saves the most recently committed configuration as the rescue configuration. This rescue configuration can be used to recover the device if future configurations cause issues. It ensures there is a stable, known-good configuration to fall back on, which is crucial in network management and troubleshooting.
References:
* "rescue : save configurations as the rescue: request system configuration save .................( saves the current configs as a rescue configs )" from Useful Juniper Commands.txt.
* Juniper official documentation: Configuring and Activating a Rescue Configuration.

NEW QUESTION # 34
Which two statements about route preference in Junos are correct? (Choose two.)

• A. Both EBGP and IBGP routes have the same preference.
• B. Both direct and static routes have the same preference.
• C. Both OSPF internal and OSPF AS external routes have the same preference.
• D. Both direct and local routes have the same preference.

Answer: C,D

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.

NEW QUESTION # 35
What are two advantages of using the Junos OS? (Choose two.)

• A. It enables you to roll back to a previous configuration.
• B. It supports up to a maximum of two previous configurations.
• C. It is modular.
• D. It pushes your configuration changes "live" immediately.

Answer: A,C

Explanation:
One of the key advantages of Junos OS is its ability to roll back to previous configurations. This feature allows administrators to revert to an earlier configuration state, which is invaluable for quickly recovering from configuration errors or undesired changes. Junos OS maintains an archive of previous configurations, enabling easy rollback to any saved state. Another significant advantage of Junos OS is its modular design.
The operating system is structured so that different processes and services run in separate protected memory spaces, enhancing the stability and reliability of the system. If one process fails, it does not affect the others, thereby minimizing the risk of system-wide failures.

NEW QUESTION # 36
An administrator configures a router's interface with an IPv4 address and subnet mask. The administrator also confirms that this interface is in an up state.
In this scenario, which two route types are created on the local router? (Choose two.)

• A. a direct route
• B. a static route
• C. a dynamic route
• D. a local route

Answer: A,D

Explanation:
When an interface on a router is configured with an IPv4 address and is in an up state, two types of routes are automatically created in the routing table: a local route and a direct route, making B and D the correct answers.
The local route represents the interface's IP address itself, indicating that the router can directly receive packets addressed to this IP. The direct route represents the subnet or network segment to which the interface is connected, indicating that the router can directly forward packets to destinations within this subnet.

NEW QUESTION # 37
Click the Exhibit button.

Referring to the exhibit, what is the source IP address of the ping that was executed?

• A. 10.12.0.2
• B. 10.23.0.3
• C. 10.23.0.2
• D. 10.24.0.4

Answer: C

Explanation:
The exhibit shows a ping test being executed from router R2 to the IP address 10.23.0.3. Since the ping command is issued on R2 and we see successful replies from 10.23.0.3, it means the source of the ping must be an interface on R2. Given the network diagram and the IP address scheme, the source IP address of the ping is on the interface ge-0/0/2 of R2, which is in the subnet 10.23.0.0/24. The only logical IP address for R2's interface in this subnet, based on standard networking practices and the given options, would be
10.23.0.2. The other addresses provided in the options belong to different subnets or are the destination of the ping itself.

NEW QUESTION # 38
How many rescue configuration files are supported on a Junos device?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: D

Explanation:
Junos OS supports only 1 rescue configuration file on a device. This rescue configuration is a safeguard feature that allows network administrators to revert to a known good configuration in case of a configuration error or issue, ensuring network stability.
In Junos OS, each device supports only one rescue configuration file. The rescue configuration is a specific configuration that can be saved and later retrieved if needed. This is used as a fallback configuration that you know works and can be applied in case of an emergency or if the current configuration has issues.
Reference:
"You can create a rescue configuration file by using the request system configuration rescue save operational mode command. Each Junos OS device can have only one rescue configuration file."

NEW QUESTION # 39
How many login classes are assignable to a user account?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/user-access-evo/user-access/topics/topic-map/junos-os-login-class.html#:~:text=You%20can%20define%20any%20number,to%20an%20individual%20user%20account.
In Junos OS, each user account can be assigned only one login class. Login classes in Junos OS define the permissions for users, controlling what they can access and modify within the system. This setup helps in maintaining a clear and secure access control mechanism.
Reference:
Junos OS Documentation on User Accounts and Login Classes.

NEW QUESTION # 40
Which type of device uses the destination IP address to forward packets?

• A. Layer 2 switch
• B. Layer 3 router
• C. hub
• D. repeater

Answer: B

Explanation:
A Layer 3 router forwards packets based on the destination IP address. It operates at the network layer of the OSI model and uses routing tables to determine the best path for packet delivery. Unlike Layer 2 switches, which forward packets based on MAC addresses, routers handle logical addressing, making them crucial for inter-network communication.

NEW QUESTION # 41
Which command modifier would you use to see all possible completions for a specific command?

• A. ?
• B. extensive
• C. |
• D. detail

Answer: A

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.

NEW QUESTION # 42
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:
"The # prompt indicates that you are in configuration mode."

NEW QUESTION # 43
Your router has a route to the 10.1.1.0/24 network with a next hop of r jet.
In this scenario, which action will your router perform when traffic destined to the 10.1.1.0/24 network is received?

• A. The traffic will be redirected using a default route.
• B. The traffic will be discarded and an ICMP unreachable message will be sent to the destination of the traffic.
• C. The traffic will be discarded and an ICMP unreachable message will be sent to the source of the traffic.
• D. The traffic will be silently discarded.

Answer: D

Explanation:
In a scenario where a router has a route to a specific network (in this case, 10.1.1.0/24) with a next hop that is unreachable or incorrectly specified (e.g., "r jet" seems to be a typo or an undefined entity), the router will typically discard the traffic destined for that network. This action is taken because the router cannot determine a valid path to forward the traffic. Unlike some scenarios where the router might generate an ICMP (Internet Control Message Protocol) unreachable message, in many configurations, especially in production networks, the traffic might be silently discarded without providing feedback to the sender, as generating ICMP messages for all undeliverable packets could lead to additional network congestion and potential security concerns.

NEW QUESTION # 44
You have configured some interfaces on a Junos device; however, you have not yet committed the configuration.
What happens if you issue the rollback 0 command in this scenario?

• A. The factory default configuration is loaded.
• B. The Junos device is rebooted.
• C. The interface changes you made are discarded.
• D. The messages.log file is deleted.

Answer: C

Explanation:
Issuing the rollback 0 command in Junos OS will discard any uncommitted changes and revert to the last committed configuration. This command effectively cancels any configuration changes that have been made but not yet committed, ensuring that the device returns to its previous stable state.
Reference:
"rollback 0 ...................................(rolls back the changes just made )" from Useful Juniper Commands.txt.
Juniper official documentation: Rolling Back a Configuration.

NEW QUESTION # 45
What are two functions of the routing protocol daemon (rpd)? (Choose two.)

• A. It maintains routing tables.
• B. It generates chassis alarms.
• C. It provides access to the CLI.
• D. It creates forwarding tables.

Answer: A,D

Explanation:
The Routing Protocol Daemon (rpd) is a critical component in Juniper Networks devices, responsible for all routing operations. It maintains routing tables, which hold information about network paths and destinations derived from various routing protocols. These tables are used to make decisions about where to send packets. Additionally, rpd generates forwarding tables based on the information in the routing tables. The forwarding tables are then used by the Packet Forwarding Engine (PFE) to actually forward packets to their next hop or final destination.

NEW QUESTION # 46
Which Junos feature limits the amount of exception traffic that is sent from the PFE to the RE?

• A. CoS markings
• B. routing policy
• C. scheduler
• D. policer

Answer: D

Explanation:
In Junos OS, a policer is a feature used to limit the rate of traffic flow in the network, including exception traffic sent from the Packet Forwarding Engine (PFE) to the Routing Engine (RE). Exception traffic consists of packets that cannot be processed by the PFE alone and requireintervention by the RE, such as control packets or packets destined for the device itself. A policer can be configured to enforce bandwidth limits and drop or mark packets that exceed specified rate limits, thus protecting the RE from being overwhelmed by excessive exception traffic.

NEW QUESTION # 47
Exhibit
user@router> show route 192.168.100.2
inet.O: 15 destinations, 17 routes (15 active, 0 holddown, 0 hidden) Limit/Threshold: 1048576/1048576 destinations
+ = Active Route, - = Last Active, * = Both 192.168.100.2/32 *[OSPF/IO] 00:14:29, metric 1
> to 172.16.1.6 via ge-0/0/1.0 [BGP/170] 00:06:49, localpref 100
AS path: 65102 I, validation-state: unverified > to 172.16.1.6 via ge-0/0/1.0 Referring to the exhibit, which statement is correct?

• A. The BGP route is preferred over the OSPF route.
• B. The OSPF path is the only active route.
• C. / Traffic is load-balanced across two routes.
• D. The BGP path is the only active route.

Answer: B

Explanation:
Referring to the exhibit, the presence of the "+" symbol next to the OSPF route for 192.168.100.2/32 indicates that this is the active route being used to forward traffic. The BGP route, although present, does not have the "+" symbol, indicating it is not the active route. In Junos OS, the routing table displays the active route with a "+" symbol, and the fact that the OSPF route has this symbol means it is the preferred path based on the routing protocol's decision process, which takes into account factors such as route preference (administrative distance) and metrics.

NEW QUESTION # 48
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