Juniper JN0-105試験問題集で[2025年最新] 有効な試験練習問題集解答 [Q13-Q31]

Juniper JN0-105試験問題集で[2025年最新] 有効な試験練習問題集解答

JN0-105問題集で掴み取れ！[最新2025]Juniper試験合格させます

質問 # 13
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. configuring a non-root username and password
B. reinstalling Junos
C. loading the factory-default configuration
D. configuring a password for the root account

正解：D

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 the set 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 # 14
What are two attributes of the UDP protocol? (Choose two.)

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

正解：B、C

解説：
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 notestablish a connection before sending data and does not guarantee delivery, order, or error checking, making it faster but less reliable than TCP.

質問 # 15
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 messages.log file is deleted.
B. The factory default configuration is loaded.
C. The Junos device is rebooted.
D. The interface changes you made are discarded.

正解：D

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 # 16
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. Someone accidentally deleted the active configuration.
C. The command only works for interface configuration differences.
D. There are no changes to the candidate configuration.

正解：D

解説：
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.

質問 # 17
You issue the telnet 10.10.10.1 source 192.168.100.1 command.
Which two statements are correct in this scenario? (Choose two.)

A. The telnet session will have a source address of 10.10.10.1.
B. The telnet session will have a destination address of 192.168.100.1.
C. The telnet session will have a source address of 192.168.100.1.
D. The telnet session will have a destination address of 10.10.10.1.

正解：C、D

解説：
In the given telnet command, "telnet 10.10.10.1 source 192.168.100.1," the destination address of the telnet session is 10.10.10.1, and the source address of the session is specified as 192.168.100.1, making C and D the correct answers. This command instructs the telnet client to use the specified source IP address when establishing the connection to the destination.

質問 # 18
You want to find out the chassis serial number of a Junos device.
Which command would display this information?

A. show chassis hardware
B. show chassis location
C. show chassis environment
D. show chassis routing-engine

正解：A

解説：
Theshow chassis hardwarecommand in Junos OS displays detailed information about the hardware installed in the device, including the chassis itself. This command provides a list of all hardware components, their serial numbers, part numbers, and version information. When looking for the chassis serial number specifically, this command is the most direct and comprehensive way to retrieve that information, as it includes the serial number of the chassis among the details provided.

質問 # 19
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] userOrouter# rollback 0
B. [edit] user@routeri rollback rescue
C. [edit] user@router# rollback 2
D. (edit] user@router# rollback 1

正解：D

解説：
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.

質問 # 20
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 request system zeroize command.
B. Enter the request system reboot command.
C. Enter the load factory-default command.
D. Enter the request system configuration rescue save command.

正解：D

解説：
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.

質問 # 21
Which two statements are correct about Junos traceoptions? (Choose two.)

A. Traceoption output, by default, is stored in /var/iog/<fiie-name>.
B. Traceoptions are enabled by default.
C. Traceoptions are enabled through configuration.
D. Traceoptions cannot be enabled in a production environment.

正解：A、C

解説：
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.

質問 # 22
Which two functions are performed by the PFE? (Choose two.)

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

正解：A、C

解説：
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.

質問 # 23
Which prompt indicates that you are using configuration mode?

A. >
B. #
C. $
D. %

正解：B

解説：
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.
Reference:
"The # prompt indicates that you are in configuration mode."

質問 # 24
Exhibit.

Referring to the exhibit, which routing configuration is required for these two users to access the remote server?

A. Users and the server require a default gateway.
B. A routing protocol must be enabled on the router.
C. Trunk ports must be enabled on the switch.
D. Users must connect directly to the router.

正解：A

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 # 25
Which three benefits occur when operating an interior gateway protocol (IGP) in an autonomous system (AS)? (Choose three.)

A. IGPs automatically distribute static routing information.
B. IGPs learn prefixes in the global Internet's routing table.
C. IGPs react very fast to network change.
D. IGPs determine the optimal paths for data transmission.
E. IGPs learn everything about the subnets and best paths within your network.

正解：C、D、E

解説：
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.

質問 # 26
Which two statements about firewall filters are correct? (Choose two.)

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

正解：A、C

解説：
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.

質問 # 27
An administrator configures a router's interface with an IPv4 address and subnet mask. The administrator also confirms that this interface is in an up state.
In this scenario, which two route types are created on the local router? (Choose two.)

A. a direct route
B. a static route
C. a local route
D. a dynamic route

正解：A、C

解説：
When an interface on a router is configured with an IPv4 address and is in an up state, two types of routes are automatically created in the routing table: a local route and a direct route, making B and D the correct answers. The local route represents the interface's IP address itself, indicating that the router can directly receive packets addressed to this IP. The direct route represents the subnet or network segment to which the interface is connected, indicating that the router can directly forward packets to destinations within this subnet.

質問 # 28
Click the Exhibit button.

Referring the exhibit, what does the highlighted number indicate?

A. hop count is 5
B. route preference is 5
C. metric is 5
D. cost is 5

正解：B

解説：
In the exhibit shown, the highlighted number next to the route type (Static) within the square brackets indicates the route preference, also known as the administrative distance. In Junos, the route preference is a value that determines the priority of the route source. Lower numbers indicate a higher priority when the routing table is being calculated. The route preference is used to select the best route when multiple paths to the same destination exist from different routing sources. The number 5 is unusually low for a static route by default, suggesting it has been manually configured to override other route types.

質問 # 29
When considering routing policies, which two statements are correct? (Choose two.)

A. An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base.
B. Routing policies are applied to interfaces as input or export filters.
C. Policy terms are evaluated from top to bottom with action taken on the first match found.
D. Policy terms are evaluated from top to bottom with the most restrictive action taken of all the matching terms.

正解：A、C

解説：
Routing policies in Junos OS are crucial for controlling route advertisements and path selection. The correct answers are B and C. An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base (RIB), and policy terms are evaluated from top to bottom, with action taken on the first match found. This sequential evaluation allows for precise control over routing decisions.

質問 # 30
Which process in the Junos OS is responsible for maintaining routing protocols and tables?

A. dcd
B. rpd
C. chassisd
D. mgd

正解：B

解説：
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.

質問 # 31
......

Juniper JN0-105 認定試験の出題範囲：

トピック	出題範囲
トピック 1	ルーティングポリシーとファイアウォールフィルター: ルーティングポリシーとファイアウォールフィルターのトピックでは、Junos デバイスのルーティングポリシーとファイアウォールフィルターについて説明します。さらに、このトピックでは、Junos デバイス上のルーティングポリシーとファイアウォールフィルターについても扱います。
トピック 2	構成の基本: このトピックでは、Junos デバイスを構成するための主要な要素の特定について説明します。さらに、Junos デバイスの基本コンポーネントの構成についても説明します。
トピック 3	運用の監視と保守: このトピックでは、Junos デバイスを監視または保守するさまざまな方法について説明します。最後に、Junos デバイスの監視またはメンテナンス手順について説明します。
トピック 4	ユーザーインターフェイス: このトピックでは、Junos ユーザーインターフェイスの概念、操作、または機能について詳しく説明します。
トピック 5	Junos OS の基礎: Junos OS のコア要素の概念、利点、機能について説明します。
トピック 6	ネットワーキングの基礎: トピックネットワーキングの基礎では、ネットワーキングのさまざまな基本要素の概念と機能の特定について説明します。