[2025年04月最新リリース]JN0-105問題集でJNCIA認証
最新の完璧なJN0-105問題集問題と解答で100%パスさせます
質問 # 22
What is a benefit of using J-Web?
- A. It provides a customizable dashboard.
- B. It provides console-based management.
- C. It provides more advanced features than the CLI.
- D. It simultaneously manages multiple devices.
正解：A
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 # 23
Exhibit
[edit system archival] user@router# show configuration {
transfer-on-commit; archive-sites {
"scp://[email protected] : /archive" password ## SECRET-DATA
"ftp://[email protected]:/archive" password "$9..."; ## SECRET-DATA
.
Referring to the exhibit, where are the configuration backup files stored?
- A. Files are stored to the SCP site but if the transfer fails, then to the FTP site.
- B. Files are stored to any site as selected by Junos internally.
- C. Files are stored to the SCP site and the FTP site in a round-robin manner.
- D. Files are stored to the SCP site and the FTP site simultaneously.
正解：D
解説：
In Junos OS, the archival configuration under [edit system] allows for the automatic backup of configuration files to designated locations upon commit. When multiple archive-sites are specified, as shown in the exhibit with both SCP and FTP sites listed, the device does not choose between them or use them in a round-robin manner. Instead, it attempts to transfer the configuration backup files to all specified sites simultaneously upon each commit. This ensures redundancy and increases the likelihood that a backup will be successfully stored even if one of the transfer methods or destinations fails.
質問 # 24
You are configuring a firewall filter on a Juniper device.
In this scenario, what are two valid terminating actions? (Choose two.)
- A. 3next term
- B. 4accept
- C. 2discarD
- D. 1 count
正解：B、C
解説：
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.
質問 # 25
Exhibit.
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
- A. Users must connect directly to the router.
- B. Users and the server require a default gateway.
- C. A routing protocol must be enabled on the router.
- D. Trunk ports must be enabled on the switch.
正解：B
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 # 26
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. Someone accidentally deleted the active configuration.
- B. There are no changes to the candidate configuration.
- C. The command only works for interface configuration differences.
- D. You must commit the configuration before any output will be shown.
正解：B
解説：
The show | compare command in Junos OS is used to display the differences between the candidate configuration and the active configuration. If no output is shown when you issue this command, it means that there are no changes between the candidate configuration and the active configuration. This indicates that the candidate configuration is identical to the active configuration, and thus no differences are displayed.
Reference:
"The show | compare command displays the differences between the candidate configuration and the active configuration. If there are no changes, no output is displayed."
質問 # 27
What are two link-state routing protocols? (Choose two.)
- A. IS-IS
- B. OSPF
- C. BGP
- D. RIP
正解：A、B
解説：
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.
質問 # 28
You issue the monitor traffic interface ge-0/0/0 command.
What will this command accomplish?
- A. It displays a packet capture on interface ge-0/0/0.
- B. It displays an operational summary of ge-0/0/0.
- C. It displays real-time statistics for interface ge-0/0/0.
- D. It displays the MTU and MAC address for ge-0/0/0.
正解：A
解説：
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.
質問 # 29
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. show interfaces extensive
- D. monitor interface traffic
正解：D
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 # 30
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 handles all processes that control the chassis components.
- C. The PFE is responsible for performing protocol updates and system management.
- D. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
正解：A、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 # 31
Which Junos OS component is responsible for maintaining the forwarding table?
- A. management daemon
- B. Routing Engine
- C. chassis control daemon
- D. Packet Forwarding Engine
正解：D
解説：
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.
質問 # 32
Which two statements about route preference in Junos are correct? (Choose two.)
- A. Both direct and local routes have the same preference.
- B. Both EBGP and IBGP routes have the same preference.
- C. Both OSPF internal and OSPF AS external routes have the same preference.
- D. Both direct and static routes have the same preference.
正解：A、C
解説：
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.
質問 # 33
Click the Exhibit button.
Referring to the exhibit, what should be configured on R1 to advertise a default static route into OSPF?
- A. a loopback interface
- B. a management interface
- C. a routing policy
- D. a firewall filter
正解：C
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 # 34
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 displays summary information about the commands and options.
- C. It displays help about a text string contained in a statement.
- D. It lists the available commands and options.
正解：B、D
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 # 35
You want to redeploy a Junos device by clearing the existing configuration and resetting it to factory defaults.
In this scenario, which command would help to accomplish this task?
- A. request system storage cleanup
- B. request system storage cleanup dry-run
- C. request system zeroize media
- D. show system storage
正解：C
解説：
The request system zeroize media command on a Junos device securely erases all data, including configuration and log files, and resets the device to its factory default settings. This command is used when redeploying a device to ensure no residual data remains from its previous deployment. It's a comprehensive and secure way to clear all configurations and data, making the device as if it were new. The other commands listed do not perform a full reset to factory defaults; for example, show system storage displays storage information, and request system storage cleanup offers to delete unnecessary files without resetting the device to factory settings.
質問 # 36
Which two statements are correct about MAC addresses? (Choose two.)
- A. The MAC address identifies the physical hardware.
- B. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
- C. Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.
- D. The source and destination MAC addresses always remains static to the final destination.
正解：A、B
解説：
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.
質問 # 37
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters are stateless.
- B. Firewall filters can match Layer 4 parameters.
- C. Firewall filters can match Layer 7 parameters.
- D. Firewall filters are stateful.
正解：A、B
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 # 38
How many login classes are assignable to a user account?
- A. 0
- B. 1
- C. 2
- D. 3
正解：C
解説：
https://www.juniper.net/documentation/us/en/software/junos/user-access-evo/user-access/topics/topic-map/junos-os-login-class.html#:~:text=You%20can%20define%20any%20number,to%20an%20individual%20user%20account.
In Junos OS, each user account can be assigned only one login class. Login classes in Junos OS define the permissions for users, controlling what they can access and modify within the system. This setup helps in maintaining a clear and secure access control mechanism.
Reference:
Junos OS Documentation on User Accounts and Login Classes.
質問 # 39
By default, how does the PFE manage unicast traffic destined for an existing forwarding table entry?
- A. It sends the traffic through one port toward its destination.
- B. It sends the traffic through the f xpl interface to the RE.
- C. It sends the traffic through multiple ports toward its destination.
- D. It sends all traffic to the control plane for further processing.
正解：A
解説：
In a Juniper Networks device, the Packet Forwarding Engine (PFE) processes unicast traffic by forwarding it according to the existing entries in the forwarding table. When the PFE encounters unicast traffic destined for an address that has a corresponding entry in the forwarding table, it directs the traffic through a specific outgoing interface or port toward its destination. This process is based on the most efficient path determined by the routing protocols in use, ensuring that the packet reaches its intended destination through a singular path, unless specific configurations such as load balancing are in place.
質問 # 40
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 interface changes you made are discarded.
- B. The Junos device is rebooted.
- C. The factory default configuration is loaded.
- D. The messages.log file is deleted.
正解：A
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 # 41
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It creates forwarding tables.
- B. It generates chassis alarms.
- C. It maintains routing tables.
- D. It provides access to the CLI.
正解：A、C
解説：
The Routing Protocol Daemon (rpd) is a critical component in Juniper Networks devices, responsible for all routing operations. It maintains routing tables, which hold information about network paths and destinations derived from various routing protocols. These tables are used to make decisions about where to send packets. Additionally, rpd generates forwarding tables based on the information in the routing tables. The forwarding tables are then used by the Packet Forwarding Engine (PFE) to actually forward packets to their next hop or final destination.
質問 # 42
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