[May-2024] Verified Juniper Exam Dumps with JN0-105 Exam Study Guide
Best Quality Juniper JN0-105 Exam Questions Prep4sureExam Realistic Practice Exams [2024]
NEW QUESTION # 13
What are two benefits when implementing class of service? (Choose two.)
- A. Latency-sensitive traffic can be prioritized.
- B. Traffic congestion can be managed.
- C. The network will be faster.
- D. Traffic congestion will be eliminated.
Answer: B
Explanation:
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.
NEW QUESTION # 14
You are asked to convert the number 7 from decimal to binary.
Which number is correct in this scenario?
- A. 0
- B. 00001000
- C. 00010000
- D. 00000111
Answer: D
Explanation:
To convert the decimal number 7 to binary, the correct representation is 00000111 (C). In binary, 7 is represented as 1+2+4 (2^0 + 2^1 + 2^2), which corresponds to the last three digits being 1 in the binary format, with leading zeros added for clarity.
NEW QUESTION # 15
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. You must commit the configuration before any output will be shown.
- B. There are no changes to the candidate configuration.
- C. Someone accidentally deleted the active configuration.
- D. The command only works for interface configuration differences.
Answer: B
Explanation:
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.
NEW QUESTION # 16
You issue the monitor traffic interface ge-0/0/0 command.
What will this command accomplish?
- A. It displays the MTU and MAC address for ge-0/0/0.
- B. It displays real-time statistics for interface ge-0/0/0.
- C. It displays an operational summary of ge-0/0/0.
- D. It displays a packet capture on interface ge-0/0/0.
Answer: D
Explanation:
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.
NEW QUESTION # 17
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.
Answer: B
Explanation:
When multiple users are configuring a Junos device using the "configure private" command, each user gets their own candidate configuration (C). 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.
NEW QUESTION # 18
Which three benefits occur when operating an interior gateway protocol (IGP) in an autonomous system (AS)?
(Choose three.)
- A. IGPs react very fast to network change.
- B. IGPs learn prefixes in the global Internet's routing table.
- C. IGPs learn everything about the subnets and best paths within your network.
- D. IGPs automatically distribute static routing information.
- E. IGPs determine the optimal paths for data transmission.
Answer: A,C,E
Explanation:
Operating an Interior Gateway Protocol (IGP) within an Autonomous System (AS) provides several benefits, including determining the optimal paths for data transmission (B), reacting quickly to network changes (D), and learning all about the subnets and best paths within the network (E). IGPs are designed to manage routing within a single AS efficiently, adapting to changes and ensuring data is routed through the best available paths.
NEW QUESTION # 19
Which two statements are true about the candidate configuration? (Choose two.)
- A. You can discard changes before committing them.
- B. Candidate configuration changes are automatically applied.
- C. Multiple users cannot modify the same candidate configuration.
- D. You can deploy multiple changes at the same time.
Answer: A,D
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 # 20
Which command displays all IPv6 routes in the default routing instance?
- A. showroute table inet6.1
- B. showroute table inet6.0
- C. showroute table inet.l
- D. showroute table inet.0
Answer: B
Explanation:
In Junos OS, the command to display IPv6 routes in the default routing instance isshow route table inet6.0.
The routing tableinet6.0specifically holds IPv6 routes. The commandshow route table inet.0is used for IPv4 routes, andinet6.1orinet.l(assuminginet.lis a typo forinet.1) are not standard Junos routing tables for displaying IPv6 routes in the default routing instance.
NEW QUESTION # 21
Which two statements describe the result when you enter? at the command-line prompt? (Choose two.)
- A. It displays help about a text string contained in a statement.
- B. It lists the available commands and options.
- C. It lists tips for the help menu.
- D. It displays summary information about the commands and options.
Answer: B,D
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 # 22
What information does the forwarding table require so that the device forwards traffic? (Choose three.)
- A. BGP local preference value
- B. outgoing interface name
- C. next hop MAC address
- D. next hop IP address
- E. OSPF metric value
Answer: B,C,D
Explanation:
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.
NEW QUESTION # 23
What are two functions of the Routing Engine? (Choose two.)
- A. It processes all management traffic.
- B. It processes transit traffic.
- C. It runs the Junos operating system.
- D. It evaluates firewall filters for transit traffic.
Answer: A,C
Explanation:
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).
NEW QUESTION # 24
What are two advantages of using the Junos OS? (Choose two.)
- A. It supports up to a maximum of two previous configurations.
- B. It enables you to roll back to a previous configuration.
- C. It is modular.
- D. It pushes your configuration changes "live" immediately.
Answer: B,C
Explanation:
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.
NEW QUESTION # 25
Which process in the Junos OS is responsible for maintaining routing protocols and tables?
- A. mgd
- B. dcd
- C. rpd
- D. chassisd
Answer: C
Explanation:
The Routing Protocol Daemon (rpd) in Junos OS is responsible for maintaining routing protocols and tables. It handles all routing information, including the calculation of routes and the population of the routing table, making it crucial for dynamic routing operations.
NEW QUESTION # 26
Exhibit
[edit]
user@routerl set interfaces ge-0/1/2 unit 0 family inet address 172.16.101.1/24 [edit] user@router# commit check configuration check succeeds
[edit]
user@router#
You need to configure interface ge-0/1/2 with an IP address of 172.16.100.1/24. You have accidentally entered
172.16.101.1/24 as shown in the exhibit.
Which command should you issue to solve the problem?
- A. (edit] user@router# rollback 1
- B. [edit] userOrouter# rollback 0
- C. [edit] user@router# rollback 2
- D. [edit] user@routeri rollback rescue
Answer: A
Explanation:
If you've committed a configuration and then need to revert to the previous configuration, therollback command is used. Since the incorrect IP address has not been committed, as indicated by thecommit check command being successful, issuingrollback 1will undo the changes made in the current session, which includes the accidental entry of the IP address.
NEW QUESTION # 27
Which layer of the OSI model contains the IP address information?
- A. Layer 2
- B. Layer 4
- C. Layer 1
- D. Layer 3
Answer: D
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 # 28
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. set interface ge-0/0/0 unit 0 family inet
- B. run show interface terse
- C. show interface ge-0/0/0
- D. request system shutdown
Answer: C
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. Theshow interface ge-0/0/0command is used to display information about a specific interface, while therequest system shutdowncommand is used to properly shut down the device. The setcommand is used in configuration mode, not operational mode, and theruncommand is used to execute operational mode commands from configuration mode.
NEW QUESTION # 29
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. interfaces
- B. names
- C. tags
- D. defaults
Answer: C
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 # 30
What will the request system configuration rescue save command do?
- A. It saves a configuration version prior to the configuration most recently committed as the rescue configuration.
- B. It saves the candidate configuration as the rescue configuration.
- C. It saves the most recently committed configuration as the rescue configuration.
- D. It activates the rescue configuration.
Answer: C
Explanation:
The "request system configuration rescue save" command in Junos OS saves the most recently committed configuration as the rescue configuration, making A the correct answer. This feature allows administrators to set a known good configuration that can be quickly reverted to in case of configuration errors or issues.
NEW QUESTION # 31
What is the protocol data unit (PDU) of the Data Link Layer?
- A. bit
- B. frame
- C. segment
- D. byte
Answer: B
Explanation:
In the OSI model, the Data Link Layer is responsible for node-to-node delivery of data. It frames the packets received from the Network Layer and prepares them for physical transmission. The Protocol Data Unit (PDU) for the Data Link Layer is called a "frame." Frames encapsulate the network layer packets, adding a header and a trailer that include the hardware addresses of the source and destination, among other things, facilitating the data link layer services like frame synchronization, flow control, and error checking.
NEW QUESTION # 32
Which type of device uses the destination IP address to forward packets?
- A. Layer 2 switch
- B. Layer 3 router
- C. hub
- D. repeater
Answer: B
Explanation:
A Layer 3 router uses the destination IP address to forward packets. The correct answer is A. Routers operate at Layer 3 of the OSI model and make forwarding decisions based on IP addresses. They are responsible for routing packets across different networks by examining the destination IP address contained in the packet's header.
NEW QUESTION # 33
When considering routing tables and forwarding tables, which two statements are correct? (Choose two.)
- A. The routing table is used by the RE to select the best route.
- B. The forwarding table stores all routes and prefixes from all protocols.
- C. The routing table stores all routes and prefixes from all protocols.
- D. The forwarding table is used by the RE to select the best route.
Answer: A,C
Explanation:
The routing table and forwarding table play distinct roles in a Junos OS device. The correct answers are A and
D: The routing table (A) is used by the Routing Engine (RE) to select the best route among all the learned routes, while the routing table (D) stores all routes and prefixes learned from all routing protocols. The forwarding table, in contrast, contains only the active routes chosen by the RE and is used by the Packet Forwarding Engine for actual packet forwarding.
NEW QUESTION # 34
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. show interface terse
- B. monitor interface traffic
- C. monitor interface ge-0/0/3
- D. show interface ge-0/0/3
Answer: C
Explanation:
Themonitor interface ge-0/0/3command 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.
NEW QUESTION # 35
Which two statements are true about the Junos OS? (Choose two.)
- A. Exception traffic is sent to the control plane.
- B. Exception traffic is never sent to the control plane.
- C. Routing tables are stored in the control plane.
- D. Routing tables are stored in the forwarding plane.
Answer: A,C
Explanation:
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 informationbase 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.
NEW QUESTION # 36
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