Juniper 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
JN0-105実際の問題解答PDFには100%カバー率リアル試験問題
Juniper JN0-105 認定試験の出題範囲：
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質問 # 10
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 any site as selected by Junos internally.
- B. Files are stored to the SCP site and the FTP site in a round-robin manner.
- C. Files are stored to the SCP site and the FTP site simultaneously.
- D. Files are stored to the SCP site but if the transfer fails, then to the FTP site.
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 # 11
What information does the forwarding table require so that the device forwards traffic? (Choose three.)
- A. outgoing interface name
- B. next hop MAC address
- C. next hop IP address
- D. OSPF metric value
- E. BGP local preference value
正解：A、B、C
解説：
The forwarding table in a network device requires specific information to efficiently forward traffic toward its destination. This includes the next hop IP address, which indicates the next router or device in the path to the destination. The outgoing interface name identifies the physical or logical interface through which the packet should be sent to reach the next hop. Lastly, the next hop MAC address is crucial for Layer 2 forwarding decisions, allowing the device to encapsulate the IP packet in a frame that can be understood by Ethernet or other Layer 2 protocols. OSPF metric values and BGP local preference values are used in the routing decision process to select the best path and populate the forwarding table but are not directly used by the forwarding table to forward traffic.
質問 # 12
You received a new Junos device and are configuring the system-related settings. You must configure this device for the current date and time on the US West coast. You have set the time zone to America/Los_Angeies. however the time and date did not change.
In this scenario, which two additional actions would satisfy this requirement? (Choose two.)
- A. Reboot the device.
- B. Configure a DNS server.
- C. Configure an NTP server.
- D. Set the date and time setting manually.
正解：C、D
解説：
When configuring the system-related settings for the current date and time on a Junos device, especially for a specific time zone like America/Los_Angeles, and the time does not automatically adjust, two effective actions can be taken. Firstly, setting the date and time manually allows for immediate correction of the system clock. This can be done via the CLI with the appropriate set date and time command. Secondly, configuring the device to use an NTP server can provide ongoing synchronization with an accurate time source, ensuring that the device maintains the correct time and date automatically in the future, even in the case of restarts or minor drifts in the internal clock.
質問 # 13
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It provides access to the CLI.
- B. It generates chassis alarms.
- C. It creates forwarding tables.
- D. It maintains routing tables.
正解：C、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 # 14
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 # 15
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
- A. Switches create a single collision domain.
- B. Switches do not learn MAC addresses.
- C. Switches flood broadcast traffic.
- D. Switches are susceptible to traffic loops.
正解：C、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 # 16
Click the Exhibit button.
Referring to the exhibit, OSPF has three export policies that match different static route prefixes. The 10.10.10.0/24 static route does not match any terms in the policyl routing policy.
What happens next in this scenario?
- A. The static route is evaluated by the poiicy3 routing policy.
- B. The static route is evaluated by the poiicy2 routing policy.
- C. The static route is rejected by the policyl routing policy.
- D. The static route is rejected by the default routing policy.
正解：B
解説：
In Junos, when multiple policies are applied to a routing protocol for route export, the routes are evaluated in the order in which the policies are listed. In the exhibit, the OSPF configuration has three export policies listed: policy1, policy2, and policy3. The static route 10.10.10.0/24 does not match any terms in policy1; therefore, it is not rejected by policy1 but is instead passed on to the next policy in the sequence, which is policy2.
If the static route matches a term in policy2 that permits the route, it will be exported into OSPF. If it does not match in policy2, it will then be evaluated by policy3. If there is no match in policy3 as well, and assuming there are no more policies listed, the route would then be subject to the default routing policy behavior, which typically rejects the route unless an explicit accept statement is present in the policies.
質問 # 17
You are trying to diagnose packet loss at interface ge-0/0/3.
In this scenario, which command would help you view error statistics in real time?
- A. show interface ge-0/0/3
- B. show interface terse
- C. monitor interface ge-0/0/3
- D. monitor interface traffic
正解：C
解説：
Themonitor interface ge-0/0/3command is used in Junos OS to view real-time statistics for a specific interface. This command helps in diagnosing issues like packet loss by displaying real-time updates of traffic and error statistics for the specified interface.
質問 # 18
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. Users must connect directly to the router.
- C. Trunk ports must be enabled on the switch.
- D. Users and the server require a default gateway.
正解：D
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 # 19
Which two statements are correct about a Routing Engine? (Choose two.)
- A. It processes CoS marked traffic.
- B. It forwards transit traffic.
- C. It processes management traffic.
- D. It maintains routing tables.
正解：C、D
解説：
The Routing Engine (RE) in Juniper Networks devices plays a pivotal role in the control plane, handling tasks that are critical for the operation and management of the network. One of its key functions is processing management traffic, which includes user commands, system configuration, and monitoring operations. The RE also maintains routing tables, which are essential for network routing decisions. These tables contain network topology information and routing paths, which the RE uses to update the Packet Forwarding Engine (PFE) so that it can forward packets appropriately. The RE does not forward transit traffic or process Class of Service (CoS) marked traffic, as these tasks are handled by the PFE.
質問 # 20
Which two actions happen when multiple users issue the configure exclusive command to enter configuration mode on a Junos device? (Choose two.)
- A. Other users can enter configuration mode.
- B. The candidate configuration is locked.
- C. Other users cannot enter configuration mode.
- D. The candidate configuration is unlocked.
正解：B、C
解説：
In Junos OS, when a user issues the configure exclusive command, it locks the candidate configuration for that user, preventing other users from making concurrent configuration changes. This exclusive lock ensures that configuration changes are managed in a controlled manner, reducing the risk of conflicting changes. As a result, while one user is in exclusive configuration mode, other users are prevented from entering configuration mode until the lock is released, either by the user committing the changes or exiting configuration mode.
質問 # 21
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. request system shutdown
- B. show interface ge-0/0/0
- C. set interface ge-0/0/0 unit 0 family inet
- D. run show interface terse
正解：B
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 # 22
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. Users must connect directly to the router.
- C. Trunk ports must be enabled on the switch.
- 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 # 23
Which two statements about firewall filters are correct? (Choose two.)
- A. Firewall filters are stateful.
- B. Firewall filters can match Layer 4 parameters.
- C. Firewall filters can match Layer 7 parameters.
- D. Firewall filters are stateless.
正解：B、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 # 24
What are two methods for navigating to configuration mode from an operational mode prompt? (Choose two.)
- A. Use the edit command.
- B. Use the exit command.
- C. Use the configure command.
- D. Use the quit command.
正解：A、C
解説：
In Junos OS, to navigate from operational mode to configuration mode, you can use either theeditorconfigure command. Both commands move the CLI from operational mode, where you can view the state of the device, to configuration mode, where you can make changes to the device's configuration.
質問 # 25
Your network infrastructure transports data, voice, and video traffic. Users are complaining that voice and video calls are not performing to their expectations.
In this scenario, which technology would you implement to improve voice and video performance on your network?
- A. CoS
- B. NAT
- C. STP
- D. IPv6
正解：A
解説：
In a network that carries diverse types of traffic like data, voice, and video, ensuring the performance of latency-sensitive applications such as voice and video calls is crucial. Class of Service (CoS) is a technology designed to prioritize network traffic, ensuring that critical applications like voice and video receive the necessary bandwidth and minimal latency. CoS mechanisms can include traffic classification, traffic policing, queue management, and scheduling. By implementing CoS, network administrators can assign higher priority to voice and video traffic, thus improving their performance across the network and addressing the users' complaints about call quality.
質問 # 26
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. 2discarD
- C. 1 count
- D. 4accept
正解：B、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 # 27
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. tags
- B. defaults
- C. names
- D. interfaces
正解：A
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 # 28
Which Junos OS component is responsible for maintaining the forwarding table?
- A. chassis control daemon
- B. management daemon
- C. Routing Engine
- 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 # 29
Which two statements about route preference in Junos are correct? (Choose two.)
- A. Both EBGP and IBGP routes have the same preference.
- B. Both OSPF internal and OSPF AS external routes have the same preference.
- C. Both direct and local routes have the same preference.
- D. Both direct and static routes have the same preference.
正解：B、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 # 30
Which command displays all IPv6 routes in the default routing instance?
- A. showroute table inet6.0
- B. showroute table inet.0
- C. showroute table inet.l
- D. showroute table inet6.1
正解：A
解説：
In Junos OS, the command to display IPv6 routes in the default routing instance isshow route table inet6.0.
The routing tableinet6.0specifically holds IPv6 routes. The commandshow route table inet.0is used for IPv4 routes, andinet6.1orinet.l(assuminginet.lis a typo forinet.1) are not standard Junos routing tables for displaying IPv6 routes in the default routing instance.
質問 # 31
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 source and destination MAC addresses always remains static to the final destination.
- C. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
- D. The MAC address identifies the physical hardware.
正解：C、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 # 32
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It provides access to the CLI.
- B. It generates chassis alarms.
- C. It creates forwarding tables.
- D. It maintains routing tables.
正解：C、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 # 33
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