JN0-105事前に試験練習テストで使おう（最新101問題)
有効なJN0-105試験解答PDF一年無料更新
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 |
|
| トピック 4 |
|
| トピック 5 |
|
| トピック 6 |
|
質問 # 28
Which two functions are performed by the PFE? (Choose two.)
- A. It implements firewall filters.
- B. It forwards transit traffic.
- C. It selects active routes.
- D. It maintains the routing table.
正解：A、B
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 # 29
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 # 30
Which prompt indicates that you are using configuration mode?
- A. %
- B. >
- C. #
- D. $
正解：C
解説：
In Junos OS, the # prompt indicates that you are in configuration mode. This mode is used for making changes to the configuration of the device.
Reference:
"The # prompt indicates that you are in configuration mode."
質問 # 31
Which two statements about route preference in Junos are correct? (Choose two.)
- A. Both direct and local routes have the same preference.
- B. Both direct and static routes have the same preference.
- C. Both OSPF internal and OSPF AS external routes have the same preference.
- D. Both EBGP and IBGP routes have the same preference.
正解：A、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 # 32
Which type of device uses the destination IP address to forward packets?
- A. Layer 3 router
- B. repeater
- C. Layer 2 switch
- D. hub
正解：A
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.
Reference:
Junos OS Documentation on Routing Fundamentals.
質問 # 33
What is the maximum number of rollback configuration files that the Junos OS will store?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Junos OS can store up to 50 rollback configuration files, making B the correct answer. These rollback files allow administrators to revert to previous configurations, providing a safety net that facilitates recovery from configuration errors or undesired changes
質問 # 34
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 the SCP site and the FTP site simultaneously.
- C. Files are stored to the SCP site and the FTP site in a round-robin manner.
- D. Files are stored to any site as selected by Junos internally.
正解：B
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 # 35
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. loading the factory-default configuration
- B. reinstalling Junos
- C. configuring a non-root username and password
- 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 # 36
Which command displays all IPv6 routes in the default routing instance?
- A. showroute table inet.l
- B. showroute table inet6.1
- C. showroute table inet6.0
- D. showroute table inet.0
正解：C
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 # 37
Which two statements describe the result when you enter? at the command-line prompt? (Choose two.)
- A. It displays summary information about the commands and options.
- B. It lists the available commands and options.
- C. It lists tips for the help menu.
- D. It displays help about a text string contained in a statement.
正解：A、B
解説：
When you enter ? at the command-line prompt in Junos OS, the system provides assistance in two significant ways. Firstly, it lists the available commands and options that can be used at the current point in the command hierarchy, aiding users in understanding what commands they can execute next. Secondly, it displays summary information about those commands and options, providing brief descriptions or additional context that can help users understand the function of each command or option. This feature is particularly useful for learning the command structure or for quick reference when specific command syntax is forgotten.
質問 # 38
Click the Exhibit button.
Referring the exhibit, what does the highlighted number indicate?
- A. route preference is 5
- B. cost is 5
- C. metric is 5
- D. hop count is 5
正解：A
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 # 39
You have just increased the MTU size of interface ge-0/0/0 and committed the configuration.
Which command would help you identify the applied MTU change?
- A. monitor interface ge-0/0/0
- B. show interfaces ge-0/0/0 terse
- C. monitor traffic interface ge-0/0/0
- D. show interfaces ge-0/0/0
正解：D
解説：
After increasing the MTU size of an interface and committing the configuration, the command to verify the applied MTU change is D, "show interfaces ge-0/0/0." This command displays detailed information about the interface, including the current MTU size, making it the best choice for verifying the applied changes.
質問 # 40
Which protocol is responsible for learning an IPv4 neighbor's MAC address?
- A. Address Resolution Protocol (ARP)
- B. Media Access Control Security (MACsec)
- C. Neighbor Discovery Protocol (NDP)
- D. Network Address Translation (NAT)
正解：A
解説：
The Address Resolution Protocol (ARP) is responsible for mapping an IPv4 address to a machine's MAC address. ARP operates at Layer 2 of the OSI model and is used to find the MAC address of a host given its IPv4 address. When a device wants to communicate with another device on the same local network, it uses ARP to discover the recipient's MAC address.
Reference:
Juniper official documentation: ARP.
Networking standards: RFC 826.
質問 # 41
Which statement is correct concerning exception traffic processing?
- A. Exception traffic is never forwarded.
- B. Exception traffic is discarded by the PFE.
- C. Exception traffic is rate-limited to protect the RE.
- D. Exception traffic is always dropped during congestion.
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 # 42
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. route-filter
- C. instance
- D. neighbor
正解：B
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 # 43
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 most recently committed configuration as the rescue configuration.
- C. It saves the candidate configuration as the rescue configuration.
- D. It activates the rescue configuration.
正解：B
解説：
The "request system configuration rescue save" command in Junos OS saves the most recently committed configuration as the rescue configuration, making A the correct answer. This feature allows administrators to set a known good configuration that can be quickly reverted to in case of configuration errors or issues.
質問 # 44
......
Junos, Associate (JNCIA-Junos)無料更新認定サンプル問題：https://www.jpntest.com/shiken/JN0-105-mondaishu
試験本場前にトレンドなJuniper JN0-105のPDF問題集を試そう：https://drive.google.com/open?id=1YMH4J-C5yLuMAz1M_iddPMHBvaTcOmxI