[2025年05月27日] 合格させるJN0-105レビューガイド、信頼され続けるJN0-105テストエンジン
JN0-105テストエンジン練習テスト問題、試験問題集
Juniper JN0-105 認定試験の出題範囲：
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質問 # 60
Which process in the Junos OS is responsible for maintaining routing protocols and tables?
- A. chassisd
- B. mgd
- C. dcd
- D. rpd
正解：D
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 # 61
What are two advantages of using the Junos OS? (Choose two.)
- A. It pushes your configuration changes "live" immediately.
- B. It supports up to a maximum of two previous configurations.
- C. It is modular.
- D. It enables you to roll back to a previous configuration.
正解：C、D
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 # 62
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
- A. Switches do not learn MAC addresses.
- B. Switches flood broadcast traffic.
- C. Switches create a single collision domain.
- D. Switches are susceptible to traffic loops.
正解：B、D
解説：
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.
質問 # 63
Which two statements apply to the Routing Engine functions? (Choose two.)
- A. It processes the transit traffic.
- B. It does not process routing updates.
- C. It responds to ping and traceroute commands.
- D. It maintains the routing tables.
正解：C、D
解説：
The Routing Engine (RE) in Juniper Networks devices plays a critical role in the control plane operations. One of its functions includes responding to network utility commands like ping and traceroute, which are essential for diagnosing network connectivity and path issues. Furthermore, the RE is responsible for maintaining the routing tables, which contain information about network paths and destinations. These tables are vital for making forwarding decisions but are distinct from the actual forwarding of packets, which is handled by the Packet Forwarding Engine (PFE).
質問 # 64
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. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
- C. The MAC address identifies the physical hardware.
- D. The source and destination MAC addresses always remains static to the final destination.
正解：B、C
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 # 65
Exhibit.
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
- A. A routing protocol must be enabled on the router.
- B. Trunk ports must be enabled on the switch.
- C. Users must connect directly to the router.
- D. Users and the server require a default gateway.
正解：D
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 # 66
Click the Exhibit button.
Referring to the exhibit, what should be configured on R1 to advertise a default static route into OSPF?
- A. a management interface
- B. a firewall filter
- C. a routing policy
- D. a loopback interface
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 # 67
Exhibit.
Referring to the exhibit, which routing configuration is required for these two users to access the remote server?
- A. A routing protocol must be enabled on the router.
- B. Trunk ports must be enabled on the switch.
- C. Users must connect directly to the router.
- D. Users and the server require a default gateway.
正解：D
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 # 68
Which process in the Junos OS is responsible for device management tasks including the CLI and commit operations?
- A. chassisd
- B. mgd
- C. dcd
- D. rpd
正解：B
解説：
In Junos OS, the management daemon (mgd) is responsible for handling all the device management tasks, including processing CLI commands and handling commit operations. The mgd daemon interacts with the Junos OS configuration database and provides the necessary logic to ensure that configuration changes are syntactically correct and do not conflict with each other. When a user commits a configuration, mgd validates the changes, applies them to the running configuration, and ensures that the necessary daemons are notified of the changes to apply them accordingly.
質問 # 69
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
- A. logged and discarded
- B. logged with no further action
- C. logged and accepted
- D. logged and rejected
正解：C
解説：
The firewall filter configuration in the exhibit specifies a filter with two terms. Term 1 matches traffic from the source address 10.0.0.0/8 and has two actions: 'log' and 'next term'. The 'log' action will record the match to a log file, and 'next term' indicates that the firewall should evaluate the next term after logging. There is no explicit action such as 'accept' or 'reject' in term 1, so by default, the traffic will be accepted unless subsequently rejected by another term.
Term 2 has the action 'reject', which discards packets that reach this term. Since there is no 'from' condition in term 2, it acts as a default rule for all traffic not matched by term 1.
Because the traffic sourced from 10.0.0.0/8 matches term 1 and there is no reject action in that term, it will be logged and then accepted by the firewall filter. There is no subsequent term that rejects this specific traffic, so the action from term 2 does not apply to it.
質問 # 70
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 interface traffic
- B. show interfaces extensive
- C. monitor traffic absolute-sequence
- D. monitor traffic
正解：A
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 # 71
Which two statements are true about the Junos OS? (Choose two.)
- A. Exception traffic is sent to the control plane.
- B. Routing tables are stored in the control plane.
- C. Exception traffic is never sent to the control plane.
- D. Routing tables are stored in the forwarding plane.
正解：A、B
解説：
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.
質問 # 72
You need to recover the root password on a Junos router without losing the current configuration settings.
Which three statements describe what you should perform in this scenario? (Choose three.)
- A. Upgrade the Junos OS to the latest version.
- B. Use a console connection to reboot the device.
- C. Hit the space bar and enter recovery when prompted.
- D. Enter and commit the new root password.
- E. Load the factory-default configuration.
正解：B、C、D
解説：
To recover the root password on a Junos router without losing the configuration, you should (A) enter and commit the new root password once you have gained access to the system, (D) hit the space bar to interrupt the boot process and enter recovery mode when prompted during the boot process, and (E) use a console connection to reboot the device and access the bootloader prompt. These steps allow you to reset the root password while preserving the existing configuration.
質問 # 73
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. tags
- D. names
正解：C
解説：
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.
質問 # 74
Exhibit
{hold:node0}[edit]
root# set system root-authentication ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups encrypted-password Encrypted password string load-key-file File (URL) containing one or more ssh keys plain-text-password Prompt for plain text password (autoencrypted)
> ssh-dsa Secure shell (ssh) DSA public key string
> ssh-rsa Secure shell (ssh) RSA public key string
{hold:node0}[edit]
root# set system root-authentication plain-text-password
New password:
Retype new password:
{hold:node0}[edit]
root# commit and-quit
[edit interfaces]
'ge-0/0/0'
HA management port cannot be configured
error: configuration check-out failed
{hold:node0}[edit]
root#
You are unable to remotely access your Juniper device using the CLI.
Referring to the exhibit, which command would you add to the existing configuration to enable remote CLI access?
- A. set system root-authentication plain-text-password
- B. set system login idle-timeout 20
- C. load factory-default
- D. set system services ssh
正解：D
解説：
In Junos OS, remote access to the device's CLI is commonly facilitated through Secure Shell (SSH), a protocol providing secure command-line access over an insecure network. The given exhibit indicates an attempt to set a root authentication password but does not show configuration for enabling remote access services. To enable SSH, which is not shown in the configuration snippet, you need to configure the device to accept SSH connections. This is done by enabling the SSH service within the system services hierarchy of the configuration. The correct command to add to the existing configuration for enabling remote CLI access via SSH isset system services ssh. This command activates the SSH service, allowing secure remote logins to the device.
質問 # 75
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@routeri rollback rescue
- B. [edit] userOrouter# rollback 0
- C. (edit] user@router# rollback 1
- D. [edit] user@router# rollback 2
正解：C
解説：
If you've committed a configuration and then need to revert to the previous configuration, the rollback command is used. Since the incorrect IP address has not been committed, as indicated by the commit check command being successful, issuing rollback 1 will undo the changes made in the current session, which includes the accidental entry of the IP address.
質問 # 76
Which process in the Junos OS is responsible for maintaining routing protocols and tables?
- A. chassisd
- B. mgd
- C. dcd
- D. rpd
正解：D
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 # 77
Which protocol would you configure to synchronize the time and date on a Junos device?
- A. RIP
- B. NMP
- C. SNMP
- D. NTP
正解：D
解説：
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.
質問 # 78
What information would you find using the CLI help command?
- A. an explanation for specific system log error messages
- B. a URL for accessing the technical documentation
- C. message of the day
- 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 # 79
You are configuring a firewall filter on a Juniper device.
In this scenario, what are two valid terminating actions? (Choose two.)
- A. accept
- B. count
- C. next term
- D. discard
正解：A、D
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 # 80
Which statement is correct concerning exception traffic processing?
- A. Exception traffic is always dropped during congestion.
- B. Exception traffic is discarded by the PFE.
- C. Exception traffic is rate-limited to protect the RE.
- D. Exception traffic is never forwarded.
正解：C
解説：
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.
質問 # 81
What are two benefits when implementing class of service? (Choose two.)
- A. Traffic congestion will be eliminated.
- B. The network will be faster.
- C. Latency-sensitive traffic can be prioritized
- D. Traffic congestion can be managed.
正解：A、C
解説：
Implementing Class of Service (CoS) in a network provides numerous benefits, particularly in managing traffic based on its importance, source, or type. CoS enables network administrators to manage traffic congestion by applying various queuing techniques and policies to ensure that critical services remain unaffected during high congestion periods. Additionally, CoS allows for the prioritization of latency-sensitive traffic such as voice and video, ensuring that these services maintain quality despite varying network conditions.
質問 # 82
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 simultaneously.
- D. Files are stored to the SCP site and the FTP site in a round-robin manner.
正解：C
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 # 83
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100%無料JN0-105日常練習試験には102問があります：https://www.passtest.jp/Juniper/JN0-105-shiken.html
JN0-105試験資料Juniper学習ガイド：https://drive.google.com/open?id=12z37koVh0BgrmOP26OsZvwWyB2ZCfwUX