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NEW QUESTION # 56
Which two external authentication methods does Junos support for administrative access? (Choose two.)
- A. TACACS+
- B. ACE
- C. NIS
- D. RADIUS
Answer: A,D
Explanation:
Junos OS supports several external authentication methods for administrative access, with TACACS+ (Terminal Access Controller Access-Control System Plus) and RADIUS (Remote Authentication Dial-In User Service) being among the most commonly used. Both TACACS+ and RADIUS are protocols that allow network devices to communicate with a central authentication server, enabling centralized control over user authentication and authorization. This centralization simplifies the management of user credentials and access policies, especially in larger networks with multiple devices.
NEW QUESTION # 57
When considering routing policies, which two statements are correct? (Choose two.)
- A. Routing policies are applied to interfaces as input or export filters.
- B. Policy terms are evaluated from top to bottom with action taken on the first match found.
- C. Policy terms are evaluated from top to bottom with the most restrictive action taken of all the matching terms.
- D. An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base.
Answer: B,D
Explanation:
Routing policies in Junos OS are crucial for controlling route advertisements and path selection. The correct answers are B and C. An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base (RIB), and policy terms are evaluated from top to bottom, with action taken on the first match found. This sequential evaluation allows for precise control over routing decisions.
NEW QUESTION # 58
What does the user@router> clear log ospf-trace command accomplish?
- A. Logging data into ospf-trace is stopped.
- B. Trace parameters are removed from the OSPF protocol configuration.
- C. Data in the ospf-trace file is removed and logging continues.
- D. The ospf-trace file is deleted.
Answer: C
Explanation:
The clear log ospf-trace command on a Juniper Networks router is used specifically to manage the contents of the log file named ospf-trace. Executing this command clears or deletes the existing data within the ospf-trace log file but does not stop the logging process. The router continues to log new OSPF-related events and data into this file after the command is executed. This functionality is crucial for troubleshooting and monitoring the OSPF (Open Shortest Path First) protocol's operation by allowing network administrators to remove old or irrelevant log data while continuously capturing new events without interruption.
NEW QUESTION # 59
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. configuring a non-root username and password
- C. reinstalling Junos
- D. configuring a password for the root account
Answer: D
Explanation:
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.
NEW QUESTION # 60
Which process in the Junos OS is responsible for maintaining routing protocols and tables?
- A. dcd
- B. mgd
- C. rpd
- D. chassisd
Answer: C
Explanation:
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.
NEW QUESTION # 61
Which command displays all IPv6 routes in the default routing instance?
- A. showroute table inet6.1
- B. showroute table inet6.0
- C. showroute table inet.0
- D. showroute table inet.1
Answer: B
Explanation:
The show route table inet6.0 command displays all IPv6 routes in the default routing instance. In Junos OS, the routing table for IPv6 addresses is referred to as inet6.0, whereas inet.0 is used for IPv4 unicast routes.
The other options do not correspond to the correct IPv6 routing table.
References:
* Juniper official documentation: Junos OS Routing Tables Overview.
NEW QUESTION # 62
What is the primary system log file that is present in the default configuration of a Junos device?
- A. vrrp
- B. jsrpd
- C. messages
- D. kmd
Answer: C
Explanation:
In the default configuration of a Junos device, the primary system log file is "messages" (B). This log file contains a wide range of system messages, including operational status changes, system errors, and other critical information, making it a key resource for troubleshooting and monitoring the system's health.
NEW QUESTION # 63
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. A routing protocol must be enabled on the router.
- C. Users and the server require a default gateway.
- D. Trunk ports must be enabled on the switch.
Answer: C
Explanation:
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.
NEW QUESTION # 64
Which two statements are correct about Junos traceoptions? (Choose two.)
- A. Traceoption output, by default, is stored in /var/iog/<fiie-name>.
- B. Traceoptions are enabled by default.
- C. Traceoptions cannot be enabled in a production environment.
- D. Traceoptions are enabled through configuration.
Answer: A,D
Explanation:
Traceoptions in Junos OS are used for detailed debugging and troubleshooting of protocols and processes within the system. They are not enabled by default due to the potential performance impact and volume of data generated. Instead, traceoptions are enabled through specific configuration settings under the relevant protocol or process hierarchy. This allows administrators to target their troubleshooting efforts and control the scope of logging. By default, the output generated by traceoptions is stored in files located in the /var/log directory, with the file name typically specified in the traceoptions configuration. This structured approach to logging and debugging helps in diagnosing complex issues without overwhelming the system or the administrator with irrelevant data.
NEW QUESTION # 65
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
Answer: B
Explanation:
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 802.1 Q 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.
NEW QUESTION # 66
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 messages.log file is deleted.
- C. The Junos device is rebooted.
- D. The factory default configuration is loaded.
Answer: A
Explanation:
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.
NEW QUESTION # 67
Click the Exhibit button.
How is traffic, sourced from 10.0.0.0/8, treated by the firewall filter shown in the exhibit?
- A. logged and discarded
- B. logged and rejected
- C. logged with no further action
- D. logged and accepted
Answer: D
Explanation:
The firewall filter configuration in the exhibit specifies a filter with two terms. Term 1 matches traffic from the source address 10.0.0.0/8 and has two actions: 'log' and 'next term'. The 'log' action will record the match to a log file, and 'next term' indicates that the firewall should evaluate the next term after logging. There is no explicit action such as 'accept' or 'reject' in term 1, so by default, the traffic will be accepted unless subsequently rejected by another term.
Term 2 has the action 'reject', which discards packets that reach this term. Since there is no 'from' condition in term 2, it acts as a default rule for all traffic not matched by term 1.
Because the traffic sourced from 10.0.0.0/8 matches term 1 and there is no reject action in that term, it will be logged and then accepted by the firewall filter. There is no subsequent term that rejects this specific traffic, so the action from term 2 does not apply to it.
NEW QUESTION # 68
What are two examples of exception traffic? (Choose two.)
- A. ping to the local device
- B. transit packets
- C. log messages
- D. routing updates
Answer: C,D
Explanation:
Exception traffic includes traffic that is not simply forwarded by the router but requires special handling, such as routing updates (B) and log messages (C). These types of traffic are processed by the router's control plane rather than just being forwarded through the data plane.
NEW QUESTION # 69
What are two physical interface properties? (Choose two.)
- A. MAC address
- B. MTU
- C. IP address
- D. routing protocols
Answer: A,B
Explanation:
Two physical interface properties in Junos OS include the MAC address (A) and the Maximum Transmission Unit (MTU) size (D). The MAC address is a hardware identifier for the network interface, while the MTU size determines the largest packet size that the interface can transmit without needing to fragment the packet.
NEW QUESTION # 70
What are two link-state routing protocols? (Choose two.)
- A. RIP
- B. IS-IS
- C. OSPF
- D. BGP
Answer: B,C
Explanation:
Link-state routing protocols are a type of routing protocol used in packet-switching networks for finding the best path between source and destination. OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are both examples of link-state routing protocols. They work by maintaining a complete map or topology of the network, allowing routers to independently calculate the best path to each destination. Unlike distance-vector protocols like RIP, link-state protocols are more efficient and scalable, making them suitable for larger networks.
NEW QUESTION # 71
In the Junos OS, which keyboard shortcut allows you to move to the start of the line?
- A. Ctrl+e
- B. Ctrl+a
- C. Ctrl+w
- D. Ctrl+k
Answer: B
Explanation:
In the Junos OS command-line interface (CLI), the keyboard shortcut Ctrl+a is used to move the cursor to the start of the line. This is a common convention in many command-line environments and text editors, providing a quick way to navigate to the beginning of the current command or line of text without having to use the arrow keys. This can be particularly useful for making quick edits to commands or for navigating long lines of text more efficiently.
NEW QUESTION # 72
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