[31-Jan-2024] New PassLeader JN0-105 JNCIA-Junos Dumps with VCE and PDF (New Questions)

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

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

Answer: CD
UDP (User Datagram Protocol) is known for being connectionless (D) and providing best-effort delivery without the reliability mechanisms present in TCP (C). This means that UDP does not establish a connection before sending data and does not guarantee delivery, order, or error checking, making it faster but less reliable than TCP.

You issue the monitor traffic interface ge-0/0/0 command. What will this command accomplish?

A.    It displays real-time statistics for interface ge-0/0/0.
B.    It displays an operational summary of ge-0/0/0.
C.    It displays the MTU and MAC address for ge-0/0/0.
D.    It displays a packet capture on interface ge-0/0/0.

Answer: D
The command “monitor traffic interface ge-0/0/0” (D) initiates a packet capture on the specified interface, allowing you to view the actual packets being transmitted and received. This is useful for troubleshooting and analyzing the traffic passing through the interface in real time.

What are two examples of exception traffic? (Choose two.)

A.    transit packets
B.    routing updates
C.    log messages
D.    ping to the local device

Answer: BC
Exception traffic includes traffic that is not simply forwarded by the router but requires special handling, such as routing updates (B) and log messages (C). These types of traffic are processed by the router’s control plane rather than just being forwarded through the data plane.

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

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

Answer: AC
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.

What information would you find using the CLI help command?

A.    hyperlinks for remediation actions
B.    a URL for accessing the technical documentation
C.    an explanation for specific system log error messages
D.    message of the day

Answer: C
The CLI help command in Junos OS provides assistance and explanations for commands, command options, and in some cases, specific system log error messages. By using the help command followed by specific keywords or messages, users can get detailed information and context for the commands they are using or errors they are encountering. This feature is particularly useful for understanding the purpose of commands, their syntax, and troubleshooting error messages that may appear in system logs.

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

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

Answer: C
Class of Service (CoS) in Junos OS provides tools for managing traffic congestion and ensuring that latency-sensitive traffic is given priority over less time-critical data. By implementing CoS, network administrators can classify traffic into different priority levels, apply scheduling policies to ensure that high-priority traffic is transmitted first, and use congestion management techniques such as queue buffers and drop profiles. This helps in maintaining the quality of service for critical applications, especially during periods of high network congestion. However, CoS does not eliminate congestion entirely nor does it inherently make the network faster; it provides a mechanism for better managing and controlling traffic flows according to their importance and time sensitivity.

Which two fields are you required to enter when you create a new user account? (Choose two.)

A.    username
B.    full name
C.    user ID
D.    login class

Answer: AD
In Junos OS, when creating a new user account, the minimum required fields are the username and the login class. The username is the identifier for the account, while the login class specifies the level of access or permissions the user has on the device. Login classes allow for the differentiation between various roles, such as read-only access or full administrative rights. Other information, such as full name or user ID, is optional and not strictly necessary for the creation of a functional user account.

What are two advantages of using the Junos OS? (Choose two.)

A.    It enables you to roll back to a previous configuration.
B.    It pushes your configuration changes “live” immediately.
C.    It is modular.
D.    It supports up to a maximum of two previous configurations.

Answer: AC
One of the key advantages of Junos OS is its ability to roll back to previous configurations. This feature allows administrators to revert to an earlier configuration state, which is invaluable for quickly recovering from configuration errors or undesired changes. Junos OS maintains an archive of previous configurations, enabling easy rollback to any saved state. Another significant advantage of Junos OS is its modular design. The operating system is structured so that different processes and services run in separate protected memory spaces, enhancing the stability and reliability of the system. If one process fails, it does not affect the others, thereby minimizing the risk of system-wide failures.

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.    next term
D.    accept

Answer: BD
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.

Which two statements about firewall filters are correct? (Choose two.)

A.    Firewall filters are stateless.
B.    Firewall filters can match Layer 7 parameters.
C.    Firewall filters are stateful.
D.    Firewall filters can match Layer 4 parameters.

Answer: AD
Firewall filters in Junos OS are stateless, meaning they process each packet individually without regard to the state of a connection or sequence of packets. These filters can match various packet attributes, including those at Layer 4, such as TCP and UDP port numbers. This allows for granular control over traffic based on the type of service or application. Unlike stateless filters, stateful firewalls keep track of the state of active connections and make decisions based on the context of the traffic flow, which is not a capability of Junos firewall filters. Additionally, Junos firewall filters primarily operate up to Layer 4 and do not natively inspect Layer 7 parameters, which involve application-level data.

Which two actions happen when multiple users issue the configure exclusive command to enter configuration mode on a Junos device? (Choose two.)

A.    Other users can enter configuration mode.
B.    The candidate configuration is unlocked.
C.    Other users cannot enter configuration mode.
D.    The candidate configuration is locked.

Answer: CD
When a user enters configuration mode using the configure exclusive command on a Junos device, the candidate configuration is locked for that user, preventing other users from making concurrent configuration changes. This exclusive lock ensures that only one user can make changes at a time, preventing conflicts and potential errors from simultaneous modifications. Other users attempting to enter configuration mode while it is locked will receive a notification that the configuration is currently being edited by another user.

What are two types of transit traffic that traverse the forwarding plane of a Layer 3 router? (Choose two.)

A.    unicast traffic
B.    multicast traffic
C.    exception traffic
D.    broadcast traffic

Answer: AB
Transit traffic that traverses the forwarding plane of a Layer 3 router includes both unicast and multicast traffic types. Unicast traffic is directed from a single source to a single destination, while multicast traffic is sent from one source to multiple destinations that are part of a multicast group. These types of traffic are efficiently routed through the network by leveraging the router’s forwarding plane capabilities. Exception traffic, which requires special handling by the control plane, and broadcast traffic, which is typically limited to a single broadcast domain and not usually forwarded by Layer 3 routers, are not considered standard types of transit traffic for the forwarding plane of a router.

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

A.    OSPF metric value
B.    next hop IP address
C.    BGP local preference value
D.    outgoing interface name
E.    next hop MAC address

Answer: BDE
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.

Which Junos OS component is responsible for maintaining the forwarding table?

A.    Routing Engine
B.    chassis control daemon
C.    Packet Forwarding Engine
D.    management daemon

Answer: C
The Packet Forwarding Engine (PFE) in Junos OS is responsible for maintaining the forwarding table. The PFE processes incoming packets, performs route lookups in the forwarding table, and forwards packets based on this information, offloading these tasks from the Routing Engine to ensure efficient packet forwarding.

Which two common routing policy actions affect the flow of policy evaluation? (Choose two.)

A.    next policy
B.    community
C.    next term
D.    next hop

Answer: AC
In Junos OS routing policy evaluation, “next policy” (A) and “next term” (C) are common actions that affect the flow of policy evaluation. “Next policy” directs the evaluation to the next policy in the sequence, whereas “next term” moves the evaluation to the next term within the current policy, allowing for granular control over routing decisions.

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

A.    It implements firewall filters.
B.    It selects active routes.
C.    It forwards transit traffic.
D.    It maintains the routing table.

Answer: AC
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.

What are two physical interface properties? (Choose two.)

A.    MAC address
B.    IP address
C.    routing protocols
D.    MTU

Answer: AD
Two physical interface properties in Junos OS include the MAC address (A) and the Maximum Transmission Unit (MTU) size (D). The MAC address is a hardware identifier for the network interface, while the MTU size determines the largest packet size that the interface can transmit without needing to fragment the packet.

What are two methods for navigating to configuration mode from an operational mode prompt? (Choose two.)

A.    Use the edit command.
B.    Use the quit command.
C.    Use the exit command.
D.    Use the configure command.

Answer: AD
In Junos OS, to navigate from operational mode to configuration mode, you can use either the edit or configure command. Both commands move the CLI from operational mode, where you can view the state of the device, to configuration mode, where you can make changes to the device’s configuration.

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

Answer: AB
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.

Which two statements are true about the Junos OS? (Choose two.)

A.    Routing tables are stored in the control plane.
B.    Exception traffic is never sent to the control plane.
C.    Exception traffic is sent to the control plane.
D.    Routing tables are stored in the forwarding plane.

Answer: AC
– In Junos OS, as with many network operating systems, the control plane is responsible for processes that determine how to route traffic. This includes maintaining routing tables, which store information about network paths and protocols. Therefore, routing tables are indeed stored in the control plane. Exception traffic refers to packets that cannot be processed by the normal fast-path processing of the Packet Forwarding Engine (PFE) in the forwarding plane, and thus are sent to the control plane for further processing. This might include packets destined for the router itself, packets that need to be fragmented, or packets that match certain firewall filter criteria, among other reasons.
– Routing tables are not stored in the forwarding plane. However, the forwarding plane contains the forwarding table (sometimes referred to as the forwarding information base or FIB), which is a distilled version of the routing table optimized for fast packet forwarding. The forwarding plane uses this information to perform the actual transfer of packets across the network device interfaces.

What are two functions of the Routing Engine? (Choose two.)

A.    It processes all management traffic.
B.    It runs the Junos operating system.
C.    It evaluates firewall filters for transit traffic.
D.    It processes transit traffic.

Answer: AB
The Routing Engine (RE) in Junos OS has several critical functions, including processing all management traffic (A) and running the Junos operating system (B). The RE handles system management tasks, user interfaces, system services, and routing protocol processes. It does not directly process transit traffic or evaluate firewall filters for transit traffic, as these tasks are handled by the Packet Forwarding Engine (PFE).

You are logged in to a Junos OS device with SSH and issued the show protocols | compare command in the configuration, but no output is shown. Which statement is correct in this scenario?

A.    The command only works for interface configuration differences.
B.    There are no changes to the candidate configuration.
C.    Someone accidentally deleted the active configuration.
D.    You must commit the configuration before any output will be shown.

Answer: B
If issuing the “show | compare” command in configuration mode yields no output, it indicates that there are no changes to the candidate configuration (B). This command is used to compare the current candidate configuration with the active configuration, and a lack of output suggests that the candidate configuration matches the active one, meaning no changes have been made or the changes have already been committed.


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