Juniper JN0-105 Online Practice Questions and Exam Preparation

Juniper JN0-105 Online Questions & Answers

• Question 41:

  What are two benefits when implementing class of service? (Choose two.)

  A. Traffic congestion will be eliminated.
  B. Traffic congestion can be managed.
  C. The network will be faster.
  D. Latency-sensitive traffic can be prioritized.
  B. Traffic congestion can be managed.
  D. Latency-sensitive traffic can be prioritized.

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  Explanation

  Class of Service (CoS) allows network administrators to manage traffic congestion and prioritize latency-sensitive traffic, such as voice or video, over less critical data, ensuring smoother and more reliable network performance during high traffic periods.

• Question 42:

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

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  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. The show interface ge-0/0/0 command is used to display information about a specific interface, while the request system shutdown command is used to properly shut down the device. The set command is used in configuration mode, not operational mode, and the run command is used to execute operational mode commands from configuration mode.

• Question 43:

  Which command modifier would you use to see all possible completions for a specific command?

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

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  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.

  Juniper Networks CLI Documentation "Use the ? command modifier to display all possible completions for a specific command."

• Question 44:

  Which criteria does the Junos OS use to select an active route when two entries exist in the routing table?

  A. the route with the lowest preference number
  B. the most recently learned dynamic route
  C. the route with the highest preference number
  D. the route with the highest metric
  A. the route with the lowest preference number

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  Explanation

  In Junos OS, when two entries for the same destination exist in the routing table, the route with the lowest preference number is selected as the active route. This preference number, also known as the route preference or administrative distance, is used to prioritize routes received from different routing protocols.

• Question 45:

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

  A. Traceoption output, by default, is stored in /var/log/.
  B. Traceoptions cannot be enabled in a production environment.
  C. Traceoptions are enabled by default.
  D. Traceoptions are enabled through configuration.
  A. Traceoption output, by default, is stored in /var/log/.
  D. Traceoptions are enabled through configuration.

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  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 46:

  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
  B. a routing policy

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  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 47:

  You want to find out the chassis serial number of a Junos device.

  Which command would display this information?

  A. show chassis environment
  B. show chassis location
  C. show chassis routing-engine
  D. show chassis hardware
  D. show chassis hardware

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  Explanation

  The show chassis hardware command in Junos OS displays detailed information about the hardware installed in the device, including the chassis itself. This command provides a list of all hardware components, their serial numbers, part numbers, and version information. When looking for the chassis serial number specifically, this command is the most direct and comprehensive way to retrieve that information, as it includes the serial number of the chassis among the details provided.

• Question 48:

  Which statement is true about the longer router-filter match type?

  A. All router within the specified prefix that are longer than or equal to the given prefix are considered a match.
  B. All router within the specified prefix that are longer or equal to the given prefix up to a defined acceptable prefix length are considered a match.
  C. All router within the specified prefix that are longer than the given prefix up to a defined acceptable prefix length are considered a match.
  D. All router within the specified prefix that are longer than given prefix are considered a match.
  A. All router within the specified prefix that are longer than or equal to the given prefix are considered a match.

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  Explanation

• Question 49:

  Which two statements apply to the Routing Engine functions? (Choose two.)

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

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  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).

• Question 50:

  Which two operating systems are used as the foundation of the Junos OS? (Choose two.)

  A. Ubuntu
  B. CentOS
  C. Linux
  D. FreeBSD
  C. Linux
  D. FreeBSD

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  Explanation