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Juniper JN0-105 Exam
Junos, Associate (JNCIA-Junos) (Page 3 )

Updated On: 7-Feb-2026
Page 3 of 21
PDF with 110 Questions

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

  1. The routing table is used by the RE to select the best route.
  2. The forwarding table stores all routes and prefixes from all protocols.
  3. The forwarding table is used by the RE to select the best route.
  4. The routing table stores all routes and prefixes from all protocols.

Answer(s): A,D

Explanation:

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.



What will the request system configuration rescue save command do?

  1. It saves the most recently committed configuration as the rescue configuration.
  2. It saves the candidate configuration as the rescue configuration.
  3. It saves a configuration version prior to the configuration most recently committed as the rescue configuration.
  4. It activates the rescue configuration.

Answer(s): 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.


Reference:

"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.



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.)

  1. a static route
  2. a local route
  3. a dynamic route
  4. a direct route

Answer(s): B,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.



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

  1. 65
  2. 50
  3. 25
  4. 19

Answer(s): B

Explanation:

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



You issue the telnet 10.10.10.1 source 192.168.100.1 command.
Which two statements are correct in this scenario? (Choose two.)

  1. The telnet session will have a source address of 10.10.10.1.
  2. The telnet session will have a destination address of 192.168.100.1.
  3. The telnet session will have a destination address of 10.10.10.1.
  4. The telnet session will have a source address of 192.168.100.1.

Answer(s): C,D

Explanation:

In the given telnet command, "telnet 10.10.10.1 source 192.168.100.1," the destination address of the telnet session is 10.10.10.1, and the source address of the session is specified as 192.168.100.1, making C and D the correct answers. This command instructs the telnet client to use the specified source IP address when establishing the connection to the destination.






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