更新された2025年04月テストエンジンに練習JN0-105テスト問題
JN0-105リアル試験問題テストエンジン問題集トレーニングには101問あります
Juniper JN0-105 認定試験の出題範囲：
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質問 # 39
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 more reliable than TCP.
- D. UDP is connectionless.
正解：B、D
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 # 40
You want to find out the chassis serial number of a Junos device.
Which command would display this information?
- A. show chassis location
- B. show chassis hardware
- C. show chassis routing-engine
- D. show chassis environment
正解：B
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 # 41
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-filter
- B. instance
- C. neighbor
- D. route-type
正解：A
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 # 42
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. tags
- C. names
- D. interfaces
正解：B
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 # 43
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 dynamic route
- B. a direct route
- C. a local route
- D. a static 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 # 44
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 uses the destination IP address to forward packets. The correct answer is A. Routers operate at Layer 3 of the OSI model and make forwarding decisions based on IP addresses. They are responsible for routing packets across different networks by examining the destination IP address contained in the packet's header.
質問 # 45
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. set interface ge-0/0/0 unit 0 family inet
- B. request system shutdown
- C. show interface ge-0/0/0
- D. run show interface terse
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. The show interface ge-0/0/0 command is used to display information about a specific interface, while the request system shutdown command is used to properly shut down the device.
The set command is used in configuration mode, not operational mode, and the run command is used to execute operational mode commands from configuration mode.
質問 # 46
Click the Exhibit button.
Referring the exhibit, what does the highlighted number indicate?
- A. cost is 5
- B. hop count is 5
- C. metric is 5
- D. route preference is 5
正解：D
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 # 47
Which two components are included in a transport header? (Choose two.)
- A. source MAC address
- B. destination MAC address
- C. destination port number
- D. source port number
正解：C、D
解説：
The transport layer in the OSI model is responsible for end-to-end communication and error recovery. In a transport header, such as TCP or UDP, the key components include the source port number and the destination port number. These port numbers are used to identify sending and receiving applications. The source port number indicates the port of the sending application, and the destination port number refers to the port of the receiving application. MAC addresses, on the other hand, are part of the data link layer (Layer 2) and would be included in an Ethernet header, not a transport header.
質問 # 48
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] user@router# rollback 2
- C. [edit] userOrouter# rollback 0
- 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, 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 # 49
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 destination address of 10.10.10.1.
- B. The telnet session will have a source address of 10.10.10.1.
- C. The telnet session will have a source address of 192.168.100.1.
- D. The telnet session will have a destination address of 192.168.100.1.
正解：A、C
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 # 50
Which protocol would you configure to synchronize the time and date on a Junos device?
- A. NMP
- B. NTP
- C. SNMP
- D. RIP
正解：B
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 # 51
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 the MTU and MAC address for ge-0/0/0.
- C. It displays an operational summary of ge-0/0/0.
- D. It displays real-time statistics for interface 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 # 52
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It provides access to the CLI.
- B. It creates forwarding tables.
- C. It maintains routing tables.
- D. It generates chassis alarms.
正解：B、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 # 53
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. There are no changes to the candidate configuration.
- C. Someone accidentally deleted the active configuration.
- D. The command only works for interface configuration differences.
正解：B
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 # 54
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：
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 # 55
Exhibit
term limit-icmp { from {
source-address {
172.25.11.0/24;
}
protocol icmp;
}
then {
count count-icmp; discard;
}
}
Referring to the exhibit, which two actions will occur when a packet matches the firewall filter? (Choose two.)
- A. A counter will be incremented.
- B. An ICMP destination unreachable message will be returned.
- C. The packet will be forwarded.
- D. The packet will be discarded.
正解：D
解説：
Referring to the firewall filter configuration in the exhibit, when a packet matches the specified term limit-icmp, two actions are defined in thethenstatement:count count-icmpanddiscard. Thecount count-icmp action means that each time a packet matches this term, a counter namedcount-icmpwill be incremented, providing a tally of how many packets have matched the term. Thediscardaction means that the packet will be dropped and not forwarded through the device. This effectively prevents the packet from reaching its intended destination. There is no action specified that would cause an ICMP destination unreachable message to be returned, nor is there any action that would allow the packet to be forwarded.
質問 # 56
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters are stateful.
- B. Firewall filters can match Layer 7 parameters.
- C. Firewall filters are stateless.
- D. Firewall filters can match Layer 4 parameters.
正解：C、D
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 # 57
Which statement is correct when multiple users are configuring a Junos device using the configure private command?
- A. A commit by any user will commit changes made by all active users.
- B. A commit will not succeed until there is only a single user in configuration mode.
- C. Each user gets their own candidate configuration.
- D. Each user shares the same candidate configuration.
正解：C
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 # 58
Which two components are included in a transport header? (Choose two.)
- A. source MAC address
- B. destination MAC address
- C. destination port number
- D. source port number
正解：C、D
質問 # 59
What are two functions of the Routing Engine? (Choose two.)
- A. It evaluates firewall filters for transit traffic.
- B. It processes all management traffic.
- C. It runs the Junos operating system.
- D. It processes transit traffic.
正解：B、C
解説：
The Routing Engine (RE) in Junos OS has several critical functions, including processing all management traffic (A) and running the Junos operating system (B). The RE handles system management tasks, user interfaces, system services, and routing protocol processes. It does not directly process transit traffic or evaluate firewall filters for transit traffic, as these tasks are handled by the Packet Forwarding Engine (PFE).
質問 # 60
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 services ssh
- D. set system root-authentication plain-text-password
正解：C
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 is set system services ssh. This command activates the SSH service, allowing secure remote logins to the device.
質問 # 61
How many login classes are assignable to a user account?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
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 # 62
Which two statements are correct about the empioyee@Ri> prompt? (Choose two.)
- A. R1 is the hostname of your device.
- B. You are in configuration mode.
- C. You are in operational mode.
- D. You are at a shell prompt.
正解：A、C
解説：
In Junos OS, the prompt employee@R1> indicates the current context of the user interface. The 'R1' part of the prompt signifies the hostname of the device, which in this case is 'R1'. The absence of a '#' symbol at the end of the prompt suggests that the user is in operational mode, as opposed to configuration mode which is indicated by a prompt ending in '#'. Operational mode allows users to view the status of the device and execute operational commands, but does not allow for configuration changes.
質問 # 63
Which protocol is responsible for learning an IPv4 neighbor's MAC address?
- A. Network Address Translation (NAT)
- B. Neighbor Discovery Protocol (NDP)
- C. Address Resolution Protocol (ARP)
- D. Media Access Control Security (MACsec)
正解：C
解説：
The Address Resolution Protocol (ARP) is a fundamental protocol used in IPv4 networking to map an IP address to its corresponding MAC (Media Access Control) address. When an IPv4 device wants to communicate with another device on the same local network, it uses ARP to find out the MAC address associated with the target device's IP address. This ensures that IP packets can be encapsulated into Ethernet frames and delivered to the correct hardware address on the local network segment. ARP does not apply to IPv6, where Neighbor Discovery Protocol (NDP) performs a similar function.
質問 # 64
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