Juniper JNCIA Sample Test Questions

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JNCIA Practice Questions

Question 1: What is the primary purpose of the OSI model in networking?

  • A. To define the physical characteristics of network cables.
  • B. To provide a standardized framework for understanding and designing networks.
  • C. To determine the IP addressing scheme for a network.
  • D. To regulate network access and security.

Answer: B. To provide a standardized framework for understanding and designing networks.

Explanation: The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a communication system or network. It helps in understanding and designing networks by breaking down the communication process into seven layers.

Question 2: Which layer of the OSI model is responsible for logical addressing, such as IP addresses?

  • A. Physical layer
  • B. Data Link layer
  • C. Network layer
  • D. Transport layer

Answer: C. Network layer

Explanation: The Network layer (Layer 3) of the OSI model is responsible for logical addressing, including IP addresses. It handles routing and forwarding of data packets between devices on different networks.

Question 3: What is the purpose of a MAC address in networking?

  • A. To identify a device on a network using a logical address.
  • B. To establish a secure encrypted connection between devices.
  • C. To uniquely identify a device at the Data Link layer.
  • D. To control access to a network.

Answer: C. To uniquely identify a device at the Data Link layer.

Explanation: A MAC (Media Access Control) address is a hardware address that uniquely identifies a device at the Data Link layer (Layer 2) of the OSI model.

Question 4: Which networking device operates at Layer 3 of the OSI model and makes decisions based on IP addresses?

  • A. Hub
  • B. Switch
  • C. Router
  • D. Bridge

Answer: C. Router

Explanation: A router operates at the Network layer (Layer 3) of the OSI model and makes routing decisions based on IP addresses. It connects different networks and facilitates the flow of data between them.

Question 5: What protocol is used for dynamic assignment of IP addresses in a network?

  • A. DNS
  • B. DHCP
  • C. SNMP
  • D. ARP

Answer: B. DHCP

Explanation: Dynamic Host Configuration Protocol (DHCP) is used for the dynamic assignment of IP addresses to devices in a network. It simplifies the process of IP configuration by automatically assigning addresses.


Question 6: What is the role of the Control Plane in Junos OS?

  • A. Handling data traffic between devices.
  • B. Managing and maintaining the device's routing tables.
  • C. Performing data forwarding operations.
  • D. Providing a user interface for configuration.

Answer: B. Managing and maintaining the device's routing tables.

Explanation: The Control Plane in Junos OS is responsible for managing and maintaining the device's routing tables. It handles control plane protocols, such as OSPF and BGP, to exchange routing information.

Question 7: Which mode allows users to view, but not modify, the configuration on a Junos device?

  • A. Operational mode
  • B. Configuration mode
  • C. Exclusive mode
  • D. View-only mode

Answer: A. Operational mode

Explanation: Operational mode allows users to view the current state of the device and its configuration. It does not allow modifications to the configuration.

Question 8: What is the purpose of the Junos OS commit operation?

  • A. To discard all changes made to the configuration.
  • B. To apply and activate the changes made to the configuration.
  • C. To save the configuration to a backup file.
  • D. To revert the device to its factory default settings.

Answer: B. To apply and activate the changes made to the configuration.

Explanation: The commit operation in Junos OS is used to apply and activate the changes made to the configuration. It ensures that the configuration changes take effect.

Question 9: Which command is used to navigate from operational mode to configuration mode in Junos OS?

  • A. configure
  • B. commit
  • C. edit
  • D. show

Answer: C. edit

Explanation: The edit command is used to navigate from operational mode to configuration mode in Junos OS. It allows users to access and modify specific configuration hierarchies.

Question 10: What is the purpose of the rollback command in Junos OS?

  • A. To discard the current configuration and revert to the previous configuration.
  • B. To view the operational status of the device.
  • C. To back up the current configuration to a file.
  • D. To display the history of configuration changes.

Answer: A. To discard the current configuration and revert to the previous configuration.

Explanation: The rollback command in Junos OS is used to discard the current configuration and revert to a previously committed configuration. It allows for easy recovery from configuration changes.


Question 11: Which Junos OS user interface provides a command-line interface (CLI) for device configuration and monitoring?

  • A. J-Web
  • B. Junos Space
  • C. CLI
  • D. SNMP

Answer: C. CLI

Explanation: The Command-Line Interface (CLI) in Junos OS provides a text-based interface for device configuration and monitoring. It allows administrators to enter commands directly.

Question 12: What is the primary purpose of the Junos OS J-Web interface?

  • A. To provide a command-line interface (CLI) for advanced users.
  • B. To enable graphical configuration and monitoring of devices.
  • C. To facilitate device communication over a secure network.
  • D. To manage user authentication and access control.

Answer: B. To enable graphical configuration and monitoring of devices.

Explanation: J-Web is the graphical user interface (GUI) in Junos OS, allowing users to configure and monitor devices using a web-based interface.

Question 13: Which command is used to display the current configuration in operational mode in the Junos OS CLI?

  • A. show configuration
  • B. display set
  • C. edit
  • D. commit check

Answer: A. show configuration

Explanation: The show configuration command in the Junos OS CLI is used to display the current configuration in operational mode.

Question 14: In Junos OS, what is the purpose of the "commit confirmed" command?

  • A. To save the configuration changes without activating them.
  • B. To discard the current configuration and revert to the previous configuration.
  • C. To apply and activate the changes immediately.
  • D. To schedule a rollback if the changes are not confirmed within a specified time.

Answer: D. To schedule a rollback if the changes are not confirmed within a specified time.

Explanation: The commit confirmed command in Junos OS is used to schedule a rollback if the changes are not confirmed within a specified time. It provides a safety mechanism for configuration changes.

Question 15: Which user interface in Junos OS allows users to schedule and automate system tasks and scripts?

  • A. CLI
  • B. Junos Space
  • C. J-Web
  • D. Automation scripts

Answer: B. Junos Space

Explanation: Junos Space is a platform in Junos OS that allows users to schedule and automate system tasks and scripts. It provides a centralized management interface.

Question 16: What is the primary function of the Routing Information Base (RIB) in Junos OS?

  • A. To store the routing tables used for forwarding data.
  • B. To maintain a record of all configured interfaces.
  • C. To perform dynamic routing protocol operations.
  • D. To manage the device's MAC addresses.

Answer: A. To store the routing tables used for forwarding data.

Explanation: The Routing Information Base (RIB) in Junos OS stores the routing tables used for forwarding data. It maintains information about available routes.

Question 17: Which dynamic routing protocol is commonly used for interior gateway routing in Junos OS?

  • A. OSPF (Open Shortest Path First)
  • B. BGP (Border Gateway Protocol)
  • C. RIP (Routing Information Protocol)
  • D. EIGRP (Enhanced Interior Gateway Routing Protocol)

Answer: A. OSPF (Open Shortest Path First)

Explanation: OSPF is a commonly used interior gateway routing protocol in Junos OS. It is designed to operate within an autonomous system (AS) and uses the link-state database for route calculation.

Question 18: What is the purpose of the next-hop address in a routing table entry?

  • A. To identify the source of the route advertisement.
  • B. To specify the exit interface for the route.
  • C. To define the administrative distance of the route.
  • D. To identify the destination of the route.

Answer: B. To specify the exit interface for the route.

Explanation: The next-hop address in a routing table entry specifies the exit interface for the route, indicating the path to reach the destination.

Question 19: Which statement accurately describes a static route in Junos OS?

  • A. It is automatically learned through dynamic routing protocols.
  • B. It is manually configured and does not change based on network conditions.
  • C. It has a lower administrative distance compared to dynamic routes.
  • D. It is used exclusively for routing between autonomous systems.

Answer: B. It is manually configured and does not change based on network conditions.

Explanation: A static route in Junos OS is manually configured and does not change dynamically based on network conditions. It provides a fixed path to reach a destination.

Question 20: What is the primary function of the Junos OS routing engine?

  • A. To forward data packets between network segments.
  • B. To manage and maintain the device's routing tables.
  • C. To provide a user interface for configuration.
  • D. To control access to the network.

Answer: B. To manage and maintain the device's routing tables.

Explanation: The Junos OS routing engine is responsible for managing and maintaining the device's routing tables. It handles control plane operations related to routing.

These questions cover various aspects of routing fundamentals as per Objective 4 in the JNCIA-Junos exam.

Question 21: What is the purpose of the "show interfaces" command in Junos OS?

  • A. To display the configuration of network interfaces.
  • B. To view the operational status of network interfaces.
  • C. To configure new network interfaces.
  • D. To enable or disable network interfaces.

Answer: B. To view the operational status of network interfaces.

Explanation: The show interfaces command in Junos OS is used to view the operational status and statistics of network interfaces on the device.

Question 22: Which command is used to enter configuration mode for a specific hierarchy in Junos OS?

  • A. set
  • B. edit
  • C. configure
  • D. commit

Answer: B. edit

Explanation: The edit command in Junos OS is used to enter configuration mode for a specific hierarchy. It allows users to navigate to the desired configuration level.

Question 23: What does the "commit check" command do in Junos OS?

  • A. It checks the syntax of the configuration without applying changes.
  • B. It activates and applies the configuration immediately.
  • C. It discards the current configuration and reverts to the previous configuration.
  • D. It saves the configuration to a backup file.

Answer: A. It checks the syntax of the configuration without applying changes.

Explanation: The commit check command in Junos OS checks the syntax of the configuration without applying changes. It helps ensure that the configuration is correct before committing.

Question 24: How can you discard uncommitted changes and exit configuration mode in Junos OS?

  • A. commit
  • B. rollback
  • C. exit
  • D. discard

Answer: D. discard

Explanation: The discard command in Junos OS is used to discard uncommitted changes and exit configuration mode without applying the changes.

Question 25: What is the purpose of the "show configuration" command in Junos OS?

  • A. To view the operational status of the device.
  • B. To display the current configuration in operational mode.
  • C. To activate and apply the configuration changes.
  • D. To revert the device to its factory default settings.

Answer: B. To display the current configuration in operational mode.

Explanation: The show configuration command in Junos OS is used to display the current configuration in operational mode. It shows the configuration settings that are actively in use.

Question 26: What is SNMP (Simple Network Management Protocol) used for in network management?

  • A. To transfer files between network devices.
  • B. To monitor and manage network devices.
  • C. To establish secure VPN connections.
  • D. To configure routing protocols.

Answer: B. To monitor and manage network devices.

Explanation: SNMP is a protocol used for network management. It allows devices to be monitored, and their status can be managed remotely.

Question 27: Which SNMP version introduces features like encryption and authentication for security enhancements?

  • A. SNMPv1
  • B. SNMPv2c
  • C. SNMPv2u
  • D. SNMPv3

Answer: D. SNMPv3

Explanation: SNMPv3 introduces security enhancements, including encryption and authentication, to ensure secure communication between the management system and network devices.

Question 28: What is the purpose of the "ping" command in network management?

  • A. To discover neighboring devices on the network.
  • B. To measure the round-trip time for packets to reach a destination.
  • C. To configure IP addresses on network interfaces.
  • D. To establish a secure connection between devices.

Answer: B. To measure the round-trip time for packets to reach a destination.

Explanation: The "ping" command is used to test network connectivity and measure the round-trip time for packets to reach a destination.

Question 29: Which Junos OS component is responsible for logging and generating system messages for network management?

  • A. Routing Engine
  • B. Packet Forwarding Engine
  • C. Control Plane
  • D. Data Plane

Answer: A. Routing Engine

Explanation: The Routing Engine in Junos OS is responsible for logging and generating system messages, making it a crucial component for network management.

Question 30: What is the primary function of the Junos OS event policy in network management?

  • A. To configure network interfaces.
  • B. To enforce security policies.
  • C. To generate actions based on specified events.
  • D. To route data packets between devices.

Answer: C. To generate actions based on specified events.

Explanation: The Junos OS event policy is used to define actions that should be taken based on specified events. It allows for automated responses to specific conditions in the network.

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