Juniper JN0-105 Online Practice Questions and Exam Preparation

Juniper JN0-105 Online Questions & Answers

• Question 131:

  Which command displays all IPv6 routes in the default routing instance?

  A. show route table inet6.0
  B. show route table inet.1
  C. show route table inet.0
  D. show route table inet6.1
  A. show route table inet6.0

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  Explanation

  The show route table inet6.0 command displays all IPv6 routes in the default routing instance. In Junos OS, the routing table for IPv6 addresses is referred to as inet6.0, whereas inet.0 is used for IPv4 unicast routes. The other options do not

  correspond to the correct IPv6 routing table.

  References:

  Juniper official documentation: Junos OS Routing Tables Overview.

• Question 132:

  You are configuring a firewall filter on a Juniper device.

  In this scenario, what are two valid terminating actions? (Choose two.)

  A. count
  B. discard
  C. accept
  D. next term
  B. discard
  C. accept

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  Explanation

  In Juniper firewall filter configurations, "discard" and "accept" are two valid terminating actions for a term within a filter. The "discard" action drops the packet, preventing it from reaching its intended destination, while the "accept" action allows the packet to pass through the filter, proceeding to its next hop or destination. "Count" is a non- terminating action that increments a counter every time a packet matches the term but does not inherently determine the packet's fate. "Next term" directs the evaluation to proceed to the next term in the filter for further processing, also a non-terminating action.

• Question 133:

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

  A. source port number
  B. source MAC address
  C. destination MAC address
  D. destination port number
  A. source port number
  D. destination port number

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  Explanation

  The transport layer in the OSI model is responsible for end-to-end communication and error recovery. In a transport header, such as TCP or UDP, the key components include the source port number and the destination port number. These port numbers are used to identify sending and receiving applications. The source port number indicates the port of the sending application, and the destination port number refers to the port of the receiving application. MAC addresses, on the other hand, are part of the data link layer (Layer 2) and would be included in an Ethernet header, not a transport header.

• Question 134:

  What is an "X" release of the Junos OS?

  A. a standard feature release
  B. a special feature release
  C. a feature velocity release
  D. a feature beta release
  B. a special feature release

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  Explanation

• Question 135:

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

  A. A commit by any user will commit changes made by all active users.
  B. Each user gets their own candidate configuration.
  C. A commit will not succeed until there is only a single user in configuration mode.
  D. Each user shares the same candidate configuration.
  B. Each user gets their own candidate configuration.

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  Explanation

  When multiple users are configuring a Junos device using the "configure private" command, each user gets their own candidate configuration. 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.

• Question 136:

  Which two statements are correct regarding Layer 2 network switches? (Choose two.)

  A. Switches flood broadcast traffic.
  B. Switches are susceptible to traffic loops.
  C. Switches do not learn MAC addresses.
  D. Switches create a single collision domain.
  A. Switches flood broadcast traffic.
  B. Switches are susceptible to traffic loops.

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  Explanation

  Layer 2 network switches are crucial components in local area networks (LANs), providing multiple functions for data packet forwarding and network segmentation. One inherent characteristic of switches is their susceptibility to traffic loops, especially in networks with redundant paths. Without proper loop prevention protocols like Spanning Tree Protocol (STP), loops can cause broadcast storms and network instability. Additionally, switches inherently flood broadcast traffic to all ports within the broadcast domain, except the port on which the broadcast was received. This is because broadcast frames are meant to be delivered to all devices within the VLAN, and the switch ensures this by flooding these frames to all ports in the VLAN, except the source port.

• Question 137:

  You have just increased the MTU size of interface ge-0/0/0 and committed the configuration. Which command would help you identify the applied MTU change?

  A. monitor traffic interface ge-0/0/0
  B. show interfaces ge-0/0/0
  C. show interfaces ge-0/0/0 terse
  D. monitor interface ge-0/0/0
  B. show interfaces ge-0/0/0

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  Explanation

  After increasing the MTU size of an interface and committing the configuration, the command to verify the applied MTU change is D, "show interfaces ge- 0/0/0." This command displays detailed information about the interface, including the current MTU size, making it the best choice for verifying the applied changes.

• Question 138:

  Which three statements describe the Transmission Control Protocol (TCP)? (Choose three.)

  A. TCP is a transport layer protocol.
  B. TCP is faster than the User Datagram Protocol (UDP).
  C. TCP provides delivery notification and error-checking mechanisms.
  D. TCP uses a best-effort delivery approach.
  E. TCP application examples include HTTP and SMTP.
  A. TCP is a transport layer protocol.
  C. TCP provides delivery notification and error-checking mechanisms.
  E. TCP application examples include HTTP and SMTP.

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  Explanation

• Question 139:

  What are two attributes of the UDP protocol? (Choose two.)

  A. UDP is connectionless.
  B. UDP is best effort.
  C. UDP is more reliable than TCP.
  D. UDP is always slower than TCP.
  A. UDP is connectionless.
  B. UDP is best effort.

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  Explanation

• Question 140:

  You are trying to diagnose packet loss at interface ge-0/0/3. In this scenario, which command would help you view error statistics in real time?

  A. monitor interface ge-0/0/3
  B. show interface ge-0/0/3
  C. show interface terse
  D. monitor interface traffic
  A. monitor interface ge-0/0/3

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  Explanation

  The monitor interface ge-0/0/3 command is used in Junos OS to view real- time statistics for a specific interface. This command helps in diagnosing issues like packet loss by displaying real-time updates of traffic and error statistics for the specified interface.