[2025年更新]合格できるJuniper JN0-105プレミアム資料テストエンジンPDFの無料問題集お試しセット
2025年最新のリアルJN0-105問題集テストエンジン試験問題はここにある
Juniper JN0-105 認定試験の出題範囲：
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質問 # 44
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. run show interface terse
- B. request system shutdown
- C. show interface ge-0/0/0
- D. set interface ge-0/0/0 unit 0 family inet
正解：C
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. Theshow interface ge-0/0/0command is used to display information about a specific interface, while therequest system shutdowncommand is used to properly shut down the device. The setcommand is used in configuration mode, not operational mode, and theruncommand is used to execute operational mode commands from configuration mode.
質問 # 45
Click the Exhibit button.
Referring to the exhibit, what is the source IP address of the ping that was executed?
- A. 10.23.0.3
- B. 10.12.0.2
- C. 10.23.0.2
- D. 10.24.0.4
正解：C
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 # 46
When considering routing tables and forwarding tables, which two statements are correct? (Choose two.)
- A. The forwarding table is used by the RE to select the best route.
- B. The forwarding table stores all routes and prefixes from all protocols.
- C. The routing table stores all routes and prefixes from all protocols.
- D. The routing table is used by the RE to select the best route.
正解：C、D
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 # 47
Click the Exhibit button.
Referring the exhibit, what does the highlighted number indicate?
- A. metric is 5
- B. route preference is 5
- C. cost is 5
- D. hop count 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 # 48
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 and the server require a default gateway.
- D. Users must connect directly to 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.
References:
* Juniper official documentation: Configuring Basic Routing.
* General networking principles.
質問 # 49
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@router# rollback 1
- B. [edit] user@routeri rollback rescue
- C. [edit] user@router# rollback 2
- D. [edit] userOrouter# rollback 0
正解：A
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 # 50
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 selects both routes.
- B. The static route will be selected.
- C. The Junos OS randomly selects one route.
- D. The OSPF route will be selected.
正解：B
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 # 51
What is a benefit of using J-Web?
- A. It simultaneously manages multiple devices.
- B. It provides console-based management.
- C. It provides more advanced features than the CLI.
- D. It provides a customizable dashboard.
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 # 52
Which type of device uses the destination IP address to forward packets?
- A. repeater
- B. Layer 2 switch
- C. Layer 3 router
- D. hub
正解：C
解説：
A Layer 3 router forwards packets based on the destination IP address. It operates at the network layer of the OSI model and uses routing tables to determine the best path for packet delivery. Unlike Layer 2 switches, which forward packets based on MAC addresses, routers handle logical addressing, making them crucial for inter-network communication.
質問 # 53
Which process in the Junos OS is responsible for maintaining routing protocols and tables?
- A. mgd
- B. chassisd
- 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 # 54
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 multiple ports toward its destination.
- C. It sends all traffic to the control plane for further processing.
- D. It sends the traffic through the f xpl interface to the RE.
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 # 55
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. The MAC address identifies the physical hardware.
- C. The source and destination MAC addresses always remains static to the final destination.
- D. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
正解：B、D
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 # 56
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
- A. Switches are susceptible to traffic loops.
- B. Switches create a single collision domain.
- C. Switches flood broadcast traffic.
- D. Switches do not learn MAC addresses.
正解：A、C
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 # 57
How many rescue configuration files are supported on a Junos device?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Junos OS supports only 1 rescue configuration file on a device. This rescue configuration is a safeguard feature that allows network administrators to revert to a known good configuration in case of a configuration error or issue, ensuring network stability.
In Junos OS, each device supports only one rescue configuration file. The rescue configuration is a specific configuration that can be saved and later retrieved if needed. This is used as a fallback configuration that you know works and can be applied in case of an emergency or if the current configuration has issues.
Reference:
"You can create a rescue configuration file by using the request system configuration rescue save operational mode command. Each Junos OS device can have only one rescue configuration file."
質問 # 58
You configured your system authentication order using the set authentication-order tacplus radius password command.
Which statement is correct in this scenario?
- A. The password authentication will only be used if the TACACS+ and RADIUS servers fail to respond.
- B. A rejection by TACACS+ will prevent a login and bypass the other two authentication methods.
- C. All authentication methods are used with the most restrictive permission set used.
- D. The password authentication method is evaluated if the TACACS+ and RADIUS servers respond with a reject message.
正解：A
解説：
In the scenario where the system authentication order is set to "tacplus radius password," the correct statement is (B). If the TACACS+ and RADIUS servers are unreachable or fail to respond, the system will fall back to using password authentication. This ensures that users can still authenticate using locally stored passwords if external authentication servers are unavailable.
質問 # 59
You are creating a new policy to accept and redistribute routes into your IGP.
In this scenario, which match criteria would you use to identify the route prefixes to select?
- A. route-type
- B. instance
- C. neighbor
- D. route-filter
正解：D
解説：
When creating a new policy to accept and redistribute routes into your Interior Gateway Protocol (IGP), the route-filter match criteria is used to identify the route prefixes to select. The route-filter statement specifies which prefixes should be matched in a policy. This allows for precise control over which routes are accepted and redistributed, facilitating efficient and secure routing policies within the network.
Reference:
"show | display set | match ge-0/0/2" indicating command examples and match criteria from Useful Juniper Commands.txt.
Juniper official documentation: Routing Policy and Firewall Filters Configuration Guide.
質問 # 60
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It maintains routing tables.
- B. It provides access to the CLI.
- C. It generates chassis alarms.
- D. It creates forwarding tables.
正解：A、D
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 # 61
How many rescue configuration files are supported on a Junos device?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Junos OS supports only 1 rescue configuration file on a device. This rescue configuration is a safeguard feature that allows network administrators to revert to a known good configuration in case of a configuration error or issue, ensuring network stability.
In Junos OS, each device supports only one rescue configuration file. The rescue configuration is a specific configuration that can be saved and later retrieved if needed. This is used as a fallback configuration that you know works and can be applied in case of an emergency or if the current configuration has issues.
質問 # 62
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. There are no changes to the candidate configuration.
- B. The command only works for interface configuration differences.
- C. Someone accidentally deleted the active configuration.
- D. You must commit the configuration before any output will be shown.
正解：A
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 # 63
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 BGP route is preferred over the OSPF route.
- B. / Traffic is load-balanced across two routes.
- C. The BGP path is the only active route.
- D. The OSPF path is the only active route.
正解：D
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 # 64
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