[2024年更新]JN0-105試験問題集でテストエンジン練習テスト問題
合格できるJN0-105試験[2024年10月24日]最新101問題
Juniper JN0-105 認定試験の出題範囲：
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質問 # 57
Exhibit.
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
- A. Trunk ports must be enabled on the switch.
- B. Users must connect directly to the router.
- C. Users and the server require a default gateway.
- D. A routing protocol must be enabled on the router.
正解：C
解説：
In a typical network configuration, users and servers require a default gateway to communicate with devices on different networks or subnets. The default gateway is usually the router's interface on the same network, which routes the traffic to other networks. This is essential for the two users to access the remote server if the server is on a different subnet, which is indicated by the different network addresses.
質問 # 58
What are two advantages of using the Junos OS? (Choose two.)
- A. It supports up to a maximum of two previous configurations.
- B. It is modular.
- C. It enables you to roll back to a previous configuration.
- D. It pushes your configuration changes "live" immediately.
正解：B、C
解説：
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.
質問 # 59
Which two statements are true about the PFE? (Choose two.)
- A. The PFE is responsible for performing protocol updates and system management.
- B. The PFE handles all processes that control the chassis components.
- C. The PFE implements various services such as policing, stateless firewall filtering, and class of service.
- D. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
正解：C、D
解説：
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.
質問 # 60
Exhibit
Exhibit
[edit]
root# set system host-name TEST_DEVICE [edit]
root# commit
[edit]
'system'
Missing mandatory statement: 'root-authentication' error: commit failed: (missing mandatory statements)
[edit] root#
You are configuring a new device.
Which action solves the error shown in the exhibit?
- A. loading the factory-default configuration
- B. configuring a non-root username and password
- C. configuring a password for the root account
- D. reinstalling Junos
正解：C
解説：
The error message in the exhibit indicates that the root-authentication statement is missing, which is mandatory for committing the configuration. In Junos OS, it is required to set a password for the root account to commit any configuration changes. This is a security measure to ensure that unauthorized users cannot access the device's configuration mode. To solve the error shown in the exhibit, configuring a password for the root account is necessary. This can be done by using theset system root-authentication plain-text-password command, after which the user will be prompted to enter a new password for the root account.
質問 # 61
Click the Exhibit button.
Referring to the exhibit, what should be configured on R1 to advertise a default static route into OSPF?
- A. a routing policy
- B. a management interface
- C. a loopback interface
- D. a firewall filter
正解：A
解説：
To advertise a default static route into OSPF on router R1, a routing policy should be configured. This policy would typically include a statement to match the default route (0.0.0.0/0) and then apply an action to set the route as an OSPF external type, which would then be redistributed into the OSPF domain. The routing policy is a set of conditions and actions that determine how routes are imported into or exported from the routing table and how routes are shared between routing instances or routing protocols. After defining the policy, it must be applied to OSPF under the export section of the OSPF configuration on R1. This process will allow R1 to announce the default route to other OSPF routers in the network, which then can use it as a gateway of last resort to reach the Internet or other networks not explicitly known to the OSPF domain.
質問 # 62
What information would you find using the CLI help command?
- A. an explanation for specific system log error messages
- B. message of the day
- C. a URL for accessing the technical documentation
- D. hyperlinks for remediation actions
正解：A
解説：
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.
質問 # 63
Which two statements describe the result when you enter? at the command-line prompt? (Choose two.)
- A. It lists tips for the help menu.
- B. It lists the available commands and options.
- C. It displays summary information about the commands and options.
- D. It displays help about a text string contained in a statement.
正解：B、C
解説：
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.
質問 # 64
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 is used by the RE to select the best route.
- C. The routing table stores all routes and prefixes from all protocols.
- D. The forwarding table stores all routes and prefixes from all protocols.
正解：A、C
解説：
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.
質問 # 65
You have configured some interfaces on a Junos device; however, you have not yet committed the configuration.
What happens if you issue the rollback 0 command in this scenario?
- A. The Junos device is rebooted.
- B. The interface changes you made are discarded.
- C. The messages.log file is deleted.
- D. The factory default configuration is loaded.
正解：B
解説：
In Junos OS, issuing therollback 0command reverts the candidate configuration to the last committed configuration. If you have made changes to some interfaces but have not committed those changes, using rollback 0will discard these uncommitted changes, reverting to the state of the configuration at the time of the last commit. This command does not affect system files likemessages.log, reboot the device, or load the factory default configuration; it simply undoes uncommitted changes.
質問 # 66
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. set interface ge-0/0/0 unit 0 family inet
- C. run show interface terse
- D. request system shutdown
正解：A
解説：
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.
質問 # 67
Which two external authentication methods does Junos support for administrative access? (Choose two.)
- A. ACE
- B. TACACS+
- C. NIS
- D. RADIUS
正解：B
解説：
Junos OS supports several external authentication methods for administrative access, with TACACS+ (Terminal Access Controller Access-Control System Plus) and RADIUS (Remote Authentication Dial-In User Service) being among the most commonly used. Both TACACS+ and RADIUS are protocols that allow network devices to communicate with a central authentication server, enabling centralized control over user authentication and authorization. This centralization simplifies the management of user credentials and access policies, especially in larger networks with multiple devices.
質問 # 68
You are asked to view the real-time usage statistics for the busiest interfaces on a device running Junos OS.
Which command will achieve this task?
- A. monitor traffic
- B. monitor traffic absolute-sequence
- C. monitor interface traffic
- D. show interfaces extensive
正解：C
解説：
To view real-time usage statistics for the busiest interfaces on a device running Junos OS, the correct command is B, "monitor interface traffic." This command provides a dynamic, real-time view of the traffic flowing through the interfaces, allowing administrators to quickly identify and monitor the busiest interfaces on the device.
質問 # 69
Which layer of the OSI model contains the IP address information?
- A. Layer 3
- B. Layer 1
- C. Layer 2
- D. Layer 4
正解：A
解説：
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.
質問 # 70
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 interface ge-0/0/0
- B. monitor traffic interface ge-0/0/0
- C. show interfaces ge-0/0/0 terse
- D. show interfaces ge-0/0/0
正解：D
解説：
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.
質問 # 71
Which two components are included in a transport header? (Choose two.)
- A. destination port number
- B. destination MAC address
- C. source port number
- D. source MAC address
正解：A、C
質問 # 72
Exhibit.
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
- A. Trunk ports must be enabled on the switch.
- B. Users must connect directly to the router.
- C. Users and the server require a default gateway.
- D. A routing protocol must be enabled on the router.
正解：C
解説：
For the users in the 10.1.1.0/24 subnet and the server in the 10.1.2.0/24 subnet to communicate with each other, they need to route packets through the router that connects these two subnets. Each user and the server need to have their default gateway set to the IP address of the router interface on their respective subnet (.254). This ensures that packets destined for other subnets are sent to the router, which then routes them to the correct destination subnet.
Reference:
Juniper official documentation: Configuring Basic Routing.
General networking principles.
質問 # 73
What are two benefits when implementing class of service? (Choose two.)
- A. Traffic congestion will be eliminated.
- B. Latency-sensitive traffic can be prioritized.
- C. The network will be faster.
- D. Traffic congestion can be managed.
正解：D
解説：
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.
質問 # 74
Exhibit
user@router> show route 192.168.100.2
inet.O: 15 destinations, 17 routes (15 active, 0 holddown, 0 hidden) Limit/Threshold: 1048576/1048576 destinations
+ = Active Route, - = Last Active, * = Both 192.168.100.2/32*[OSPF/IO] 00:14:29, metric 1
> to 172.16.1.6 via ge-0/0/1.0 [BGP/170] 00:06:49, localpref 100
AS path: 65102 I, validation-state: unverified > to 172.16.1.6 via ge-0/0/1.0 Referring to the exhibit, which statement is correct?
- A. The OSPF path is the only active route.
- B. The BGP path is the only active route.
- C. The BGP route is preferred over the OSPF route.
- D. / Traffic is load-balanced across two routes.
正解：A
解説：
Referring to the exhibit, the presence of the "+" symbol next to the OSPF route for 192.168.100.2/32 indicates that this is the active route being used to forward traffic. The BGP route, although present, does not have the
"+" symbol, indicating it is not the active route. In Junos OS, the routing table displays the active route with a
"+" symbol, and the fact that the OSPF route has this symbol means it is the preferred path based on the routing protocol'sdecision process, which takes into account factors such as route preference (administrative distance) and metrics.
質問 # 75
Which character is used to filter the command output in the Junos CLI?
- A. |
- B. >
- C. <
- D. ?
正解：A
解説：
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.
質問 # 76
You have configured some interfaces on a Junos device; however, you have not yet committed the configuration.
What happens if you issue the rollback 0 command in this scenario?
- A. The Junos device is rebooted.
- B. The interface changes you made are discarded.
- C. The messages.log file is deleted.
- D. The factory default configuration is loaded.
正解：B
解説：
Issuing the rollback 0 command in Junos OS will discard any uncommitted changes and revert to the last committed configuration. This command effectively cancels any configuration changes that have been made but not yet committed, ensuring that the device returns to its previous stable state.
Reference:
"rollback 0 ...................................(rolls back the changes just made )" from Useful Juniper Commands.txt.
Juniper official documentation: Rolling Back a Configuration.
質問 # 77
In the Junos OS, which keyboard shortcut allows you to move to the start of the line?
- A. Ctrl+k
- B. Ctrl+a
- C. Ctrl+w
- D. Ctrl+e
正解：B
解説：
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.
質問 # 78
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