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NEW QUESTION 76
Which two statements are correct about the employee@R1> prompt? (Choose two.)
A. R1 is the hostname of your device.
B. You are in operational mode.
C. You are in configuration mode.
D. You are at a shell prompt.
Answer: AB
Explanation:
In Junos OS, the prompt employee@R1> indicates the current context of the user interface. The ‘R1’ part of the prompt signifies the hostname of the device, which in this case is ‘R1’. The absence of a ‘#’ symbol at the end of the prompt suggests that the user is in operational mode, as opposed to configuration mode which is indicated by a prompt ending in ‘#’. Operational mode allows users to view the status of the device and execute operational commands, but does not allow for configuration changes.
NEW QUESTION 77
What are two link-state routing protocols? (Choose two.)
A. RIP
B. BGP
C. OSPF
D. IS-IS
Answer: CD
Explanation:
Link-state routing protocols are a type of routing protocol used in packet-switching networks for finding the best path between source and destination. OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are both examples of link-state routing protocols. They work by maintaining a complete map or topology of the network, allowing routers to independently calculate the best path to each destination. Unlike distance-vector protocols like RIP, link-state protocols are more efficient and scalable, making them suitable for larger networks.
NEW QUESTION 78
Which two statements are correct about MAC addresses? (Choose two.)
A. Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.
B. The source and destination MAC addresses always remains static to the final destination.
C. The MAC address identifies the physical hardware.
D. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
Answer: CD
Explanation:
MAC (Media Access Control) addresses are unique identifiers assigned to network interfaces for communications at the data link layer of a network segment. MAC addresses are used to identify the physical hardware on a network. In the context of Ethernet switches, the destination MAC address in incoming frames is used to determine the appropriate output port for forwarding the frame towards its final destination. The switch does not change the destination MAC address; it uses the MAC address to make forwarding decisions within the local network segment.
NEW QUESTION 79
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. The candidate configuration is locked.
D. Other users cannot enter configuration mode.
Answer: CD
Explanation:
In Junos OS, when a user issues the configure exclusive command, it locks the candidate configuration for that user, preventing other users from making concurrent configuration changes. This exclusive lock ensures that configuration changes are managed in a controlled manner, reducing the risk of conflicting changes. As a result, while one user is in exclusive configuration mode, other users are prevented from entering configuration mode until the lock is released, either by the user committing the changes or exiting configuration mode.
NEW QUESTION 80
Which statement is correct concerning exception traffic processing?
A. Exception traffic is always dropped during congestion.
B. Exception traffic is rate-limited to protect the RE.
C. Exception traffic is discarded by the PFE.
D. Exception traffic is never forwarded.
Answer: B
Explanation:
Exception traffic refers to packets that the Packet Forwarding Engine (PFE) cannot process normally and must be forwarded to the Routing Engine (RE) for further processing. This includes packets destined for the router itself or packets needing special handling that the PFE cannot provide. To protect the RE from being overwhelmed by such traffic, which could potentially impact the router’s control plane functions, exception traffic is rate-limited. This means that there’s a threshold to how much exception traffic can be sent to the RE, ensuring that the router’s critical management and control functions remain stable and responsive even during high traffic volumes or attacks.
NEW QUESTION 81
Which component is considered part of the data plane?
A. the Routing Engine
B. the Packet Forwarding Engine
C. the power supply
D. the fan tray
Answer: B
Explanation:
The Packet Forwarding Engine (PFE) is an integral component of Juniper Networks devices, responsible for the data plane operations. The data plane, also known as the forwarding plane, is where the actual processing and forwarding of packets occur based on the routing and forwarding tables. The PFE executes the forwarding decisions made by the Routing Engine (RE), handling all packet transmissions, including routing, filtering, and switching packets towards their destination. This contrasts with the control plane operations handled by the RE, which involve routing table maintenance, system management, and control protocol processing.
NEW QUESTION 82
Which two statements are correct about a Routing Engine? (Choose two.)
A. It processes CoS marked traffic.
B. It forwards transit traffic.
C. It processes management traffic.
D. It maintains routing tables.
Answer: CD
Explanation:
The Routing Engine (RE) in Juniper Networks devices plays a pivotal role in the control plane, handling tasks that are critical for the operation and management of the network. One of its key functions is processing management traffic, which includes user commands, system configuration, and monitoring operations. The RE also maintains routing tables, which are essential for network routing decisions. These tables contain network topology information and routing paths, which the RE uses to update the Packet Forwarding Engine (PFE) so that it can forward packets appropriately. The RE does not forward transit traffic or process Class of Service (CoS) marked traffic, as these tasks are handled by the PFE.
NEW QUESTION 83
Your network infrastructure transports data, voice, and video traffic. Users are complaining that voice and video calls are not performing to their expectations. In this scenario, which technology would you implement to improve voice and video performance on your network?
A. NAT
B. CoS
C. STP
D. IPv6
Answer: B
Explanation:
In a network that carries diverse types of traffic like data, voice, and video, ensuring the performance of latency-sensitive applications such as voice and video calls is crucial. Class of Service (CoS) is a technology designed to prioritize network traffic, ensuring that critical applications like voice and video receive the necessary bandwidth and minimal latency. CoS mechanisms can include traffic classification, traffic policing, queue management, and scheduling. By implementing CoS, network administrators can assign higher priority to voice and video traffic, thus improving their performance across the network and addressing the users’ complaints about call quality.
NEW QUESTION 84
A network administrator is attempting to route traffic on a Juniper switch to one of three different VLANs: Prod, Test, and Dev. Each VLAN has been assigned a numerical value. In this scenario, what are these numerical values called?
A. defaults
B. interfaces
C. names
D. tags
Answer: D
Explanation:
In the context of VLANs (Virtual Local Area Networks) on a Juniper switch, the numerical values assigned to each VLAN, such as those for Prod, Test, and Dev, are known as VLAN tags. These tags are part of the 802.1Q VLAN standard, which allows multiple VLANs to coexist on a single physical network. Each tag uniquely identifies the VLAN to which a frame belongs, enabling the switch to segregate and manage traffic based on VLAN membership. This tagging mechanism allows for efficient traffic separation and management, ensuring that devices within one VLAN do not receive traffic intended for another, thus maintaining network security and efficiency.
NEW QUESTION 85
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
A. Switches create a single collision domain.
B. Switches are susceptible to traffic loops.
C. Switches flood broadcast traffic.
D. Switches do not learn MAC addresses.
Answer: BC
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.
NEW QUESTION 86
What does the user@router> clear log ospf-trace command accomplish?
A. Logging data into ospf-trace is stopped.
B. Trace parameters are removed from the OSPF protocol configuration.
C. Data in the ospf-trace file is removed and logging continues.
D. The ospf-trace file is deleted.
Answer: C
Explanation:
The clear log ospf-trace command on a Juniper Networks router is used specifically to manage the contents of the log file named ospf-trace. Executing this command clears or deletes the existing data within the ospf-trace log file but does not stop the logging process. The router continues to log new OSPF-related events and data into this file after the command is executed. This functionality is crucial for troubleshooting and monitoring the OSPF (Open Shortest Path First) protocol’s operation by allowing network administrators to remove old or irrelevant log data while continuously capturing new events without interruption.
NEW QUESTION 87
Your router has a route to the 10.1.1.0/24 network with a next hop of r jet. In this scenario, which action will your router perform when traffic destined to the 10.1.1.0/24 network is received?
A. The traffic will be discarded and an ICMP unreachable message will be sent to the destination of the traffic.
B. The traffic will be discarded and an ICMP unreachable message will be sent to the source of the traffic.
C. The traffic will be redirected using a default route.
D. The traffic will be silently discarded.
Answer: D
Explanation:
In a scenario where a router has a route to a specific network (in this case, 10.1.1.0/24) with a next hop that is unreachable or incorrectly specified (e.g., “r jet” seems to be a typo or an undefined entity), the router will typically discard the traffic destined for that network. This action is taken because the router cannot determine a valid path to forward the traffic. Unlike some scenarios where the router might generate an ICMP (Internet Control Message Protocol) unreachable message, in many configurations, especially in production networks, the traffic might be silently discarded without providing feedback to the sender, as generating ICMP messages for all undeliverable packets could lead to additional network congestion and potential security concerns.
NEW QUESTION 88
Which layer of the OSI model contains the IP address information?
A. Layer 2
B. Layer 3
C. Layer 1
D. Layer 4
Answer: B
Explanation:
The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions in seven distinct layers. IP (Internet Protocol) addresses are part of Layer 3, known as the Network Layer. This layer is responsible for packet forwarding, including routing through intermediate routers, and it handles the logical addressing scheme of the network to ensure that packets can be routed across multiple networks and reach their destination. IP addresses provide unique identifiers for network interfaces, allowing for communication between devices on a network or across different networks.
NEW QUESTION 89
Which two statements are true about the PFE? (Choose two.)
A. The PFE implements various services such as policing, stateless firewall filtering, and class of service.
B. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
C. The PFE handles all processes that control the chassis components.
D. The PFE is responsible for performing protocol updates and system management.
Answer: AB
Explanation:
The Packet Forwarding Engine (PFE) in Juniper Networks devices is the heart of the data plane, handling the actual forwarding of packets based on pre-computed forwarding tables. It provides several critical services to manage and control traffic flow, including policing (to enforce bandwidth limits for certain traffic types), stateless firewall filtering (to permit or deny traffic based on predefined criteria), and Class of Service (CoS) (to prioritize traffic to ensure quality of service for critical applications). The PFE utilizes both Layer 2 (MAC addresses) and Layer 3 (IP addresses) forwarding tables to make intelligent forwarding decisions, ensuring that packets are efficiently routed toward their final destination.
NEW QUESTION 90
Which two statements describe the result when you enter ? at the command-line prompt? (Choose two.)
A. It lists the available commands and options.
B. It lists tips for the help menu.
C. It displays help about a text string contained in a statement.
D. It displays summary information about the commands and options.
Answer: AD
Explanation:
When you enter ? at the command-line prompt in Junos OS, the system provides assistance in two significant ways. Firstly, it lists the available commands and options that can be used at the current point in the command hierarchy, aiding users in understanding what commands they can execute next. Secondly, it displays summary information about those commands and options, providing brief descriptions or additional context that can help users understand the function of each command or option. This feature is particularly useful for learning the command structure or for quick reference when specific command syntax is forgotten.
NEW QUESTION 91
Which two statements are true about the candidate configuration? (Choose two.)
A. Candidate configuration changes are automatically applied.
B. You can deploy multiple changes at the same time.
C. Multiple users cannot modify the same candidate configuration.
D. You can discard changes before committing them.
Answer: BD
Explanation:
The candidate configuration in Junos OS is a temporary configuration that allows network administrators to make and stage multiple configuration changes before applying them to the device. This approach enables the deployment of multiple changes in a single operation, ensuring that all configurations work together as intended before making them active. Additionally, the candidate configuration can be discarded if the administrator decides not to apply the staged changes, allowing for a “trial and error” approach without affecting the currently active configuration. This feature provides flexibility and reduces the risk of disruptive changes to the network.
NEW QUESTION 92
Which two statements about route preference in Junos are correct? (Choose two.)
A. Both direct and static routes have the same preference.
B. Both direct and local routes have the same preference.
C. Both OSPF internal and OSPF AS external routes have the same preference.
D. Both EBGP and IBGP routes have the same preference.
Answer: BC
Explanation:
In Junos OS, route preference (also known as administrative distance) is used to determine the preferred route among multiple routes to the same destination learned via different routing protocols. Direct and local routes, which represent directly connected networks and interfaces, typically share the same low preference value, indicating high trustworthiness because they are directly connected to the router. OSPF internal routes (routes within the same OSPF area) and OSPF AS external routes (routes that are external to the OSPF autonomous system but redistributed into OSPF) also share the same preference value, although this value is higher (indicating less trust) than for direct and local routes. This distinction helps the routing engine decide which routes to use when multiple paths are available.
NEW QUESTION 93
In the Junos OS, which keyboard shortcut allows you to move to the start of the line?
A. Ctrl+a
B. Ctrl+e
C. Ctrl+w
D. Ctrl+k
Answer: A
Explanation:
In the Junos OS command-line interface (CLI), the keyboard shortcut Ctrl+a is used to move the cursor to the start of the line. This is a common convention in many command-line environments and text editors, providing a quick way to navigate to the beginning of the current command or line of text without having to use the arrow keys. This can be particularly useful for making quick edits to commands or for navigating long lines of text more efficiently.
NEW QUESTION 94
Which protocol would you configure to synchronize the time and date on a Junos device?
A. SNMP
B. RIP
C. NTP
D. NMP
Answer: C
Explanation:
The Network Time Protocol (NTP) is designed to synchronize the clocks of computers over a network. Configuring NTP on a Junos device ensures that its clock is set accurately, which is crucial for logging, troubleshooting, and maintaining the integrity of time-sensitive operations and security protocols. NTP allows devices to use a hierarchy of time sources, from primary servers synchronized to a reference clock (such as an atomic clock or GPS time) to secondary servers that distribute the time to other devices on the network.
NEW QUESTION 95
You received a new Junos device and are configuring the system-related settings. You must configure this device for the current date and time on the US West coast. You have set the time zone to America/Los_Angeies. however the time and date did not change. In this scenario, which two additional actions would satisfy this requirement? (Choose two.)
A. Set the date and time setting manually.
B. Configure an NTP server.
C. Configure a DNS server.
D. Reboot the device.
Answer: AB
Explanation:
When configuring the system-related settings for the current date and time on a Junos device, especially for a specific time zone like America/Los_Angeles, and the time does not automatically adjust, two effective actions can be taken. Firstly, setting the date and time manually allows for immediate correction of the system clock. This can be done via the CLI with the appropriate set date and time command. Secondly, configuring the device to use an NTP server can provide ongoing synchronization with an accurate time source, ensuring that the device maintains the correct time and date automatically in the future, even in the case of restarts or minor drifts in the internal clock.
NEW QUESTION 96
You have completed the initial configuration of your new Junos device. You want to be able to load this configuration at a later time. Which action enables you to perform this task?
A. Enter the load factory-default command.
B. Enter the request system reboot command.
C. Enter the request system zeroize command.
D. Enter the request system configuration rescue save command.
Answer: D
Explanation:
In Junos OS, the request system configuration rescue save command is used to save the current active configuration as a rescue configuration. This feature is particularly useful for preserving a known good configuration state that can be quickly reverted to in case of configuration errors or issues. By saving a rescue configuration, administrators can ensure that they have a reliable fallback option that can be loaded in the future to restore the device’s operation without having to reconfigure from scratch. This is an essential practice for maintaining network stability and quick recovery.
NEW QUESTION 97
Which two statements are correct about Junos traceoptions? (Choose two.)
A. Traceoptions cannot be enabled in a production environment.
B. Traceoptions are enabled through configuration.
C. Traceoptions are enabled by default.
D. Traceoption output, by default, is stored in /var/iog/<fiie-name>.
Answer: BD
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.
NEW QUESTION 98
Which character is used to filter the command output in the Junos CLI?
A. |
B. >
C. <
D. ?
Answer: A
Explanation:
In the Junos CLI, the pipe character | is used as a filter operator to refine command output. This operator can be combined with various filtering commands like match, except, count, etc., to display only the relevant portions of the command output. For example, using | match <pattern> filters the output to show only the lines that contain the specified pattern, making it easier to find specific information within extensive command output. This functionality is especially useful in managing and troubleshooting complex configurations and network states, allowing for more efficient analysis of the device’s operational status and configuration details.
NEW QUESTION 99
Which command modifier would you use to see all possible completions for a specific command?
A. |
B. detail
C. ?
D. extensive
Answer: C
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.
NEW QUESTION 100
You are asked to configure your device running Junos OS to automatically archive your configuration upon commit. In this scenario, which two methods are supported by the Junos OS? (Choose two.)
A. SCP
B. RCP
C. FTP
D. HTTP
Answer: AB
Explanation:
Junos OS supports multiple methods for automatically archiving configurations upon commit. Two of the supported methods are SCP (Secure Copy Protocol) and RCP (Remote Copy Protocol). These methods can be configured to save the configuration files to a remote server automatically whenever a commit is made.
NEW QUESTION 101
Which prompt indicates that you are using configuration mode?
A. >
B. $
C. #
D. %
Answer: C
Explanation:
In Junos OS, the # prompt indicates that you are in configuration mode. This mode is used for making changes to the configuration of the device.
NEW QUESTION 102
……
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