2026 Realistic JN0-105 Dumps Exam Tips Test Pdf Exam Material
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NEW QUESTION # 58
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. Set the date and time setting manually.
- B. Configure a DNS server.
- C. Reboot the device.
- D. Configure an NTP server.
Answer: A,D
Explanation:
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.
NEW QUESTION # 59
You are asked to view the real-time usage statistics for the busiest interfaces on a device running Junos OS.
Which command will achieve this task?
- A. monitor traffic absolute-sequence
- B. monitor traffic
- C. monitor interface traffic
- D. show interfaces extensive
Answer: C
Explanation:
To view real-time usage statistics for the busiest interfaces on a device running Junos OS, the correct command is B, "monitor interface traffic." This command provides a dynamic, real-time view of the traffic flowing through the interfaces, allowing administrators to quickly identify and monitor the busiest interfaces on the device.
NEW QUESTION # 60
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. show interfaces ge-0/0/0 terse
- B. monitor traffic interface ge-0/0/0
- C. show interfaces ge-0/0/0
- D. monitor interface ge-0/0/0
Answer: C
Explanation:
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.
NEW QUESTION # 61
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 direct route
- B. a local route
- C. a dynamic route
- D. a static route
Answer: A,B
Explanation:
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.
NEW QUESTION # 62
How many rescue configuration files are supported on a Junos device?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
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.
NEW QUESTION # 63
How many rescue configuration files are supported on a Junos device?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
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."
NEW QUESTION # 64
Which type of device uses the destination IP address to forward packets?
- A. hub
- B. Layer 2 switch
- C. repeater
- D. Layer 3 router
Answer: D
Explanation:
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.
NEW QUESTION # 65
You are configuring a firewall filter on a Juniper device.
In this scenario, what are two valid terminating actions? (Choose two.)
- A. 4accept
- B. 1 count
- C. 2discarD
- D. 3next term
Answer: A,C
Explanation:
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.
NEW QUESTION # 66
Which two statements are true about the candidate configuration? (Choose two.)
- A. You can discard changes before committing them.
- B. Candidate configuration changes are automatically applied.
- C. Multiple users cannot modify the same candidate configuration.
- D. You can deploy multiple changes at the same time.
Answer: A,D
Explanation:
The candidate configuration in Junos OS is a temporary configuration that allows network administrators to make and stage multiple configuration changes before applying them to the device. This approach enables the deployment of multiple changes in a single operation, ensuring that all configurations work together as intended before making them active. Additionally, the candidate configuration can be discarded if the administrator decides not to apply the staged changes, allowing for a "trial and error" approach without affecting the currently active configuration. This feature provides flexibility and reduces the risk of disruptive changes to the network.
NEW QUESTION # 67
Which two external authentication methods does Junos support for administrative access? (Choose two.)
- A. ACE
- B. RADIUS
- C. NIS
- D. TACACS+
Answer: 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 # 68
You need to recover the root password on a Junos router without losing the current configuration settings.
Which three statements describe what you should perform in this scenario? (Choose three.)
- A. Upgrade the Junos OS to the latest version.
- B. Load the factory-default configuration.
- C. Enter and commit the new root password.
- D. Hit the space bar and enter recovery when prompted.
- E. Use a console connection to reboot the device.
Answer: C,D,E
Explanation:
To recover the root password on a Junos router without losing the configuration, you should (A) enter and commit the new root password once you have gained access to the system, (D) hit the space bar to interrupt the boot process and enter recovery mode when prompted during the boot process, and (E) use a console connection to reboot the device and access the bootloader prompt. These steps allow you to reset the root password while preserving the existing configuration.
NEW QUESTION # 69
What are two link-state routing protocols? (Choose two.)
- A. RIP
- B. BGP
- C. OSPF
- D. IS-IS
Answer: C,D
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 # 70
Click the Exhibit button.
Referring to the exhibit, what is the source IP address of the ping that was executed?
- A. 10.23.0.2
- B. 10.12.0.2
- C. 10.24.0.4
- D. 10.23.0.3
Answer: A
Explanation:
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.
NEW QUESTION # 71
What are two functions of the routing protocol daemon (rpd)? (Choose two.)
- A. It creates forwarding tables.
- B. It maintains routing tables.
- C. It provides access to the CLI.
- D. It generates chassis alarms.
Answer: A,B
Explanation:
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.
NEW QUESTION # 72
Which type of device uses the destination IP address to forward packets?
- A. hub
- B. Layer 2 switch
- C. repeater
- D. Layer 3 router
Answer: D
Explanation:
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.
NEW QUESTION # 73
Which two components are included in a transport header? (Choose two.)
- A. destination port number
- B. destination MAC address
- C. source port number
- D. source MAC address
Answer: A,C
Explanation:
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.
NEW QUESTION # 74
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 do not learn MAC addresses.
- D. Switches flood broadcast traffic.
Answer: A,D
Explanation:
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.
NEW QUESTION # 75
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 accepted
- B. logged and rejected
- C. logged with no further action
- D. logged and discarded
Answer: A
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 # 76
Which statement is correct about the candidate configuration in the Junos OS?
- A. It is created when you execute a commit from the CLI
- B. It contains changes that have not been committed
- C. It is only used to restore the configuration to factory default settings
- D. It contains the most recent rescue configuration
Answer: B
Explanation:
In Junos OS, there are two main configuration databases:
* Candidate configuration: a working copy of the configuration that holds any uncommitted changes.
All configuration edits are made here.
* Active configuration: the running configuration that the system currently uses.
When you issue a commit command, the candidate configuration is promoted to active, replacing the previous configuration. Until that happens, all changes remain in the candidate configuration and do not affect device operation.
From Junos Fundamentals Guide:
"The candidate configuration is a separate copy of the configuration database. All changes are made to the candidate configuration and do not take effect until they are committed." References:
Juniper TechLibrary - Junos Configuration Fundamentals
JNCIA-Junos Exam Objective: Configuration Basics
NEW QUESTION # 77
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