Prepare JN0-105 Exam Questions [2025] Recently Updated Questions [Q55-Q71]

JN0-105 Juniper

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January 15, 2025

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Prepare JN0-105 Exam Questions [2025] Recently Updated Questions

Give push to your success with JN0-105 exam questions

Q55. Click the Exhibit button.

How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?

logged and discarded

logged and rejected

logged with no further action

logged and accepted

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.

Q56. Which two statements are correct about Junos traceoptions? (Choose two.)

Traceoption output, by default, is stored in /var/iog/<fiie-name>.

Traceoptions are enabled through configuration.

Traceoptions cannot be enabled in a production environment.

Traceoptions are enabled by default.

Q57. Which two components are included in a transport header? (Choose two.)

destination MAC address

source port number

destination port number

source MAC address

Q58. Which process in the Junos OS is responsible for maintaining routing protocols and tables?

mgd

chassisd

rpd

dcd

The Routing Protocol Daemon (rpd) in Junos OS is responsible for maintaining routing protocols and tables. It handles all routing information, including the calculation of routes and the population of the routing table, making it crucial for dynamic routing operations.

Q59. What information does the forwarding table require so that the device forwards traffic? (Choose three.)

OSPF metric value

outgoing interface name

next hop IP address

BGP local preference value

next hop MAC address

The forwarding table in a network device requires specific information to efficiently forward traffic toward its destination. This includes the next hop IP address, which indicates the next router or device in the path to the destination. The outgoing interface name identifies the physical or logical interface through which the packet should be sent to reach the next hop. Lastly, the next hop MAC address is crucial for Layer 2 forwarding decisions, allowing the device to encapsulate the IP packet in a frame that can be understood by Ethernet or other Layer 2 protocols. OSPF metric values and BGP local preference values are used in the routing decision process to select the best path and populate the forwarding table but are not directly used by the forwarding table to forward traffic.

Q60. How many rescue configuration files are supported on a Junos device?

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.”

Q61. You are creating a new policy to accept and redistribute routes into your IGP.
In this scenario, which match criteria would you use to identify the route prefixes to select?

instance

route-type

neighbor

route-filter

When creating a policy to accept and redistribute routes into your IGP, “route-filter” (D) is the match criteria used to identify specific route prefixes. Route filters enable you to specify which routes should be accepted, rejected, or modified based on their attributes, such as prefix length or value.

Q62. How many login classes are assignable to a user account?

Junos OS supports multiple login classes that can be assigned to user accounts, allowing for different levels of access and permissions. The correct answer is C, 4. These classes include “super-user,” “read-only,”
“operator,” and “unauthorized.” Each class provides a different level of access to the Junos device, ranging from full configuration and operational command privileges to limited access for monitoring and viewing configurations.

Q63. You want to redeploy a Junos device by clearing the existing configuration and resetting it to factory defaults.
In this scenario, which command would help to accomplish this task?

show system storage

request system storage cleanup

request system storage cleanup dry-run

request system zeroize media

The request system zeroize media command on a Junos device securely erases all data, including configuration and log files, and resets the device to its factory default settings. This command is used when redeploying a device to ensure no residual data remains from its previous deployment. It’s a comprehensive and secure way to clear all configurations and data, making the device as if it were new. The other commands listed do not perform a full reset to factory defaults; for example, show system storage displays storage information, and request system storage cleanup offers to delete unnecessary files without resetting the device to factory settings.

Q64. Which two functions are performed by the PFE? (Choose two.)

It implements firewall filters.

It selects active routes.

It forwards transit traffic.

It maintains the routing table.

The Packet Forwarding Engine (PFE) in Junos OS performs several key functions, including implementing firewall filters (A) and forwarding transit traffic (C). The PFE applies firewall filter rules to incoming and outgoing traffic and is responsible for the high-speed forwarding of packets based on the information in the forwarding table.

Q65. When considering routing tables and forwarding tables, which two statements are correct? (Choose two.)

The routing table is used by the RE to select the best route.

The forwarding table stores all routes and prefixes from all protocols.

The forwarding table is used by the RE to select the best route.

The routing table stores all routes and prefixes from all protocols.

The routing table and forwarding table play distinct roles in a Junos OS device. The correct answers are A and D.
The routing table (A) is used by the Routing Engine (RE) to select the best route among all the learned routes, while the routing table (D) stores all routes and prefixes learned from all routing protocols. The forwarding table, in contrast, contains only the active routes chosen by the RE and is used by the Packet Forwarding Engine for actual packet forwarding.

Q66. What are two functions of the routing protocol daemon (rpd)? (Choose two.)

It generates chassis alarms.

It provides access to the CLI.

It creates forwarding tables.

It maintains routing tables.

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.

Q67. What is the maximum number of rollback configuration files that the Junos OS will store?

Junos OS can store up to 50 rollback configuration files, making B the correct answer. These rollback files allow administrators to revert to previous configurations, providing a safety net that facilitates recovery from configuration errors or undesired changes

Q68. Which protocol is responsible for learning an IPv4 neighbor’s MAC address?

Address Resolution Protocol (ARP)

Network Address Translation (NAT)

Media Access Control Security (MACsec)

Neighbor Discovery Protocol (NDP)

The Address Resolution Protocol (ARP) is responsible for mapping an IPv4 address to a machine’s MAC address. ARP operates at Layer 2 of the OSI model and is used to find the MAC address of a host given its IPv4 address. When a device wants to communicate with another device on the same local network, it uses ARP to discover the recipient’s MAC address.
Reference:
Juniper official documentation: ARP.
Networking standards: RFC 826.

Q69. Which two statements are correct about Junos traceoptions? (Choose two.)

Traceoptions cannot be enabled in a production environment.

Traceoptions are enabled through configuration.

Traceoptions are enabled by default.

Traceoption output, by default, is stored in /var/iog/<fiie-name>.

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.

Q70. What are two functions of the routing protocol daemon (rpd)? (Choose two.)

It generates chassis alarms.

It provides access to the CLI.

It creates forwarding tables.

It maintains routing tables.

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.

Q71. Which statement is correct when multiple users are configuring a Junos device using the configure private command?

A commit by any user will commit changes made by all active users.

A commit will not succeed until there is only a single user in configuration mode.

Each user gets their own candidate configuration.

Each user shares the same candidate configuration.

When multiple users are configuring a Junos device using the “configure private” command, each user gets their own candidate configuration (C). This allows for isolated configuration sessions, where changes made by one user do not impact or interfere with the changes made by another user in their private session.

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