更新済みの2024年12月 JN0-105試験練習テスト問題
検証済みJN0-105問題集と解答100%一発合格保証で更新された問題集
質問 # 47
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. Trunk ports must be enabled on the switch.
- 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 # 48
Which two fields are you required to enter when you create a new user account? (Choose two.)
- A. full name
- B. username
- C. login class
- D. user ID
正解：B、C
解説：
In Junos OS, when creating a new user account, the minimum required fields are theusernameand thelogin class. The username is the identifier for the account, while the login class specifies the level of access or permissions the user has on the device. Login classes allow for the differentiation between various roles, such as read-only access or full administrative rights. Other information, such as full name or user ID, is optional and not strictly necessary for the creation of a functional user account.
質問 # 49
Exhibit
policy-options { policy-statement Load-Balance-Policy { term Load-Balance { then { load-balance per-flow; accept;
}
}
}
}
routing-options {
router-id 192.168.100.11; autonomous-system 65201; forwarding-table {
export Load-Balance-Policy;
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The policy must be applied under the protocols hierarchy.
- B. The policy enables equal cost load balancing in the forwarding table.
- C. The policy enables flow-based load balancing.
- D. The policy enables per-packet load balancing.
正解：B
解説：
Theload-balance per-flowstatement in the Junos OS policy-options configuration enables flow-based load balancing in the forwarding table. This means that the traffic is distributed across multiple paths based on flows, where a flow is typically identified by attributes such as source and destination IP addresses, and possibly layer 4 information like TCP/UDP ports. This allows for more granular and efficient utilization of available paths, avoiding overloading a single path. The policy does not enable per-packet load balancing, which would send individual packets of the same flow over different paths, potentially causing out-of-order delivery issues. The policy's placement in theforwarding-tableexport suggests it's intended to influence forwarding behavior, not just routing protocol decisions, and does not necessarily have to be applied under the protocols hierarchy.
質問 # 50
Which two statements are true about the PFE? (Choose two.)
- A. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
- B. The PFE is responsible for performing protocol updates and system management.
- C. The PFE handles all processes that control the chassis components.
- D. The PFE implements various services such as policing, stateless firewall filtering, and class of service.
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 # 51
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 activates the rescue configuration.
- D. It saves the most recently committed configuration as the rescue configuration.
正解：D
解説：
The request system configuration rescue save command in Junos OS saves the most recently committed configuration as the rescue configuration. This rescue configuration can be used to recover the device if future configurations cause issues. It ensures there is a stable, known-good configuration to fall back on, which is crucial in network management and troubleshooting.
Reference:
"rescue : save configurations as the rescue: request system configuration save .................( saves the current configs as a rescue configs )" from Useful Juniper Commands.txt.
Juniper official documentation: Configuring and Activating a Rescue Configuration.
質問 # 52
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 static route
- B. a direct route
- C. a local route
- D. a dynamic route
正解：B、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 # 53
Which two functions are performed by the PFE? (Choose two.)
- A. It maintains the routing table.
- B. It selects active routes.
- C. It forwards transit traffic.
- D. It implements firewall filters.
正解：C、D
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 # 54
Which statement is correct when multiple users are configuring a Junos device using the configure private command?
- A. A commit will not succeed until there is only a single user in configuration mode.
- B. Each user shares the same candidate configuration.
- C. A commit by any user will commit changes made by all active users.
- D. Each user gets their own candidate configuration.
正解：D
解説：
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.
質問 # 55
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 factory default configuration is loaded.
- B. The messages.log file is deleted.
- C. The interface changes you made are discarded.
- D. The Junos device is rebooted.
正解：C
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 # 56
You are asked to convert the number 7 from decimal to binary.
Which number is correct in this scenario?
- A. 00010000
- B. 00000111
- C. 0
- D. 00001000
正解：B
解説：
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.
質問 # 57
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. Traffic congestion will be eliminated.
- D. The network will be faster.
正解：B
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 # 58
Click the Exhibit button.
Referring to the exhibit, what is the source IP address of the ping that was executed?
- A. 10.12.0.2
- B. 10.24.0.4
- C. 10.23.0.3
- D. 10.23.0.2
正解：D
解説：
The exhibit shows a ping test being executed from router R2 to the IP address 10.23.0.3. Since the ping command is issued on R2 and we see successful replies from 10.23.0.3, it means the source of the ping must be an interface on R2. Given the network diagram and the IP address scheme, the source IP address of the ping is on the interface ge-0/0/2 of R2, which is in the subnet 10.23.0.0/24. The only logical IP address for R2's interface in this subnet, based on standard networking practices and the given options, would be 10.23.0.2. The other addresses provided in the options belong to different subnets or are the destination of the ping itself.
質問 # 59
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters can match Layer 4 parameters.
- B. Firewall filters are stateful.
- C. Firewall filters are stateless.
- D. Firewall filters can match Layer 7 parameters.
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, Junosfirewall filters primarily operate up to Layer 4 and do not natively inspect Layer 7 parameters, which involve application-level data.
質問 # 60
Which two statements are correct about firewall filters? (Choose two.)
- A. "Accept" is the default action of packets that are not explicitly allowed.
- B. "Discard" is the default action of packets that are not explicitly allowed.
- C. There can be multiple firewall filters.
- D. There can be only one firewall filter.
正解：B、C
解説：
In Juniper Networks devices, firewall filters are used to control packet flow through the device. The default action for packets that do not match any of the specified criteria in the firewall filter is to discard them, enhancing network security by ensuring that only explicitly allowed traffic can pass through. Furthermore, it is possible to configure multiple firewall filters on a device, allowing for granular control over traffic based on various criteria such as source, destination, and protocol type.
質問 # 61
What are two advantages of using the Junos OS? (Choose two.)
- A. It is modular.
- B. It pushes your configuration changes "live" immediately.
- C. It supports up to a maximum of two previous configurations.
- D. It enables you to roll back to a previous configuration.
正解：A、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
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. loading the factory-default configuration
- C. reinstalling Junos
- 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 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 # 63
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 configuration rescue save command.
- C. Enter the load factory-default command.
- D. Enter the request system reboot command.
正解：B
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 # 64
Which two statements about route preference in Junos are correct? (Choose two.)
- A. Both direct and static routes have the same preference.
- B. Both EBGP and IBGP routes have the same preference.
- C. Both direct and local routes have the same preference.
- D. Both OSPF internal and OSPF AS external routes have the same preference.
正解：C、D
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 # 65
What is a benefit of using J-Web?
- A. It provides a customizable dashboard.
- B. It provides console-based management.
- C. It simultaneously manages multiple devices.
- D. It provides more advanced features than the CLI.
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 # 66
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. load factory-default
- B. set system login idle-timeout 20
- C. set system root-authentication plain-text-password
- 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 # 67
Exhibit
user@router> show route 192.168.36.1
inet.O: 5 destinations, 6 routes (5 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both
192.168.36.1/32 *[Static/5] 00:00:31
> to 10.1.1.2 via ge-0/0/10.0 [OSPF/IO] 00:02:21, metric 1 > to 10.1.1.2 via ge-0/0/10.0 Referring to the exhibit, which route(s) will be selected by Junos for packet forwarding?
- A. The Junos OS randomly selects one route.
- B. The Junos OS selects both routes.
- C. The OSPF route will be selected.
- D. The static route will be selected.
正解：D
解説：
Junos OS selects routes based on the route preference (also known as administrative distance). Static routes typically have a lower route preference than OSPF routes, meaning they are more preferred. Since the static route to 192.168.36.1/32 is shown with a preference of 5, it will be selected over the OSPF route for packet forwarding, assuming no other factors such as route filters or policies affect the routing decision.
質問 # 68
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：A、B
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 # 69
Which two common routing policy actions affect the flow of policy evaluation? (Choose two.)
- A. next hop
- B. community
- C. next policy
- D. next term
正解：C、D
解説：
In Junos OS routing policy evaluation, "next policy" (A) and "next term" (C) are common actions that affect the flow of policy evaluation. "Next policy" directs the evaluation to the next policy in the sequence, whereas "next term" moves the evaluation to the next term within the current policy, allowing for granular control over routing decisions.
質問 # 70
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
- A. Switches create a single collision domain.
- B. Switches are susceptible to traffic loops.
- C. Switches do not learn MAC addresses.
- D. Switches flood broadcast traffic.
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 # 71
......
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 |
|
| トピック 2 |
|
| トピック 3 |
|
究極の準備用無料ガイドJN0-105試験問題と解答：https://drive.google.com/open?id=1YMH4J-C5yLuMAz1M_iddPMHBvaTcOmxI
合格できるJNCIA JN0-105試験問題集には101問があります：https://www.jpntest.com/shiken/JN0-105-mondaishu