Latest Juniper JN0-105 Practice Test Questions, Junos, Associate (JNCIA-Junos) Exam Dumps
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Juniper JN0-105 Exam Syllabus Topics:
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NEW QUESTION # 54
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 storedto the SCP site and the FTP site simultaneously.
- B. Files are storedto the SCP site and the FTP site in a round-robinmanner.
- C. Files are storedto any site as selected by Junos internally.
- D. Files are storedto the SCP site but if the transfer fails, then to theFTP site.
Answer: A
Explanation:
In Junos OS, thearchivalconfiguration under[edit system]allows for the automatic backup of configuration files to designated locations upon commit. When multiplearchive-sitesare 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.
NEW QUESTION # 55
Exhibit
policy-options { policy-statement Load-Balance-Policy { term Load-Balance { then { load-balance per-flow; accept;
}
}
}
}
routing-options {
router-id 192.168.100.11; autonomous-system 65201; forwarding-table {
export Load-Balance-Policy;
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The policy enables equal cost load balancing in the forwarding table.
- B. The policy enables per-packet load balancing.
- C. The policy must be applied under the protocols hierarchy.
- D. The policy enables flow-based load balancing.
Answer: A,D
Explanation:
The load-balance per-flow statement in the Junos OS policy-options configuration enables flow-based load balancing in the forwarding table. This means that the traffic is distributed across multiple paths based on flows, where a flow is typically identified by attributes such as source and destination IP addresses, and possibly layer 4 information like TCP/UDP ports. This allows for more granular and efficient utilization of available paths, avoiding overloading a single path. The policy does not enable per-packet load balancing, which would send individual packets of the same flow over different paths, potentially causing out-of-order delivery issues. The policy's placement in the forwarding-table export suggests it's intended to influence forwarding behavior, not just routing protocol decisions, and does not necessarily have to be applied under the protocols hierarchy.
NEW QUESTION # 56
What are two advantages of using the Junos OS? (Choose two.)
- A. It is modular.
- B. It supports up to a maximum of two previous configurations.
- C. It pushes your configuration changes "live" immediately.
- D. It enables you to roll back to a previous configuration.
Answer: A,D
Explanation:
One of the key advantages of Junos OS is its ability to roll back to previous configurations. This feature allows administrators to revert to an earlier configuration state, which is invaluable for quickly recovering from configuration errors or undesired changes. Junos OS maintains an archive of previous configurations, enabling easy rollback to any saved state. Another significant advantage of Junos OS is its modular design.
The operating system is structured so that different processes and services run in separate protected memory spaces, enhancing the stability and reliability of the system. If one process fails, it does not affect the others, thereby minimizing the risk of system-wide failures.
NEW QUESTION # 57
You want to find out the chassis serial number of a Junos device.
Which command would display this information?
- A. show chassis environment
- B. show chassis hardware
- C. show chassis location
- D. show chassis routing-engine
Answer: B
Explanation:
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.
NEW QUESTION # 58
How many login classes are assignable to a user account?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
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.
NEW QUESTION # 59
You are configuring a firewall filter on a Juniper device.
In this scenario, what are two valid terminating actions? (Choose two.)
- A. accept
- B. discard
- C. next term
- D. count
Answer: A,B
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 # 60
Which two fields are you required to enter when you create a new user account? (Choose two.)
- A. full name
- B. username
- C. login class
- D. user ID
Answer: B,C
Explanation:
In Junos OS, when creating a new user account, the minimum required fields are theusernameand thelogin class. The username is the identifier for the account, while the login class specifies the level of access or permissions the user has on the device. Login classes allow for the differentiation between various roles, such as read-only access or full administrative rights. Other information, such as full name or user ID, is optional and not strictly necessary for the creation of a functional user account.
NEW QUESTION # 61
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. IPv6
- B. NAT
- C. CoS
- D. STP
Answer: C
Explanation:
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.
NEW QUESTION # 62
Which two statements are true about the PFE? (Choose two.)
- A. The PFE implements various services such as policing, stateless firewall filtering, and class of service.
- B. The PFE is responsible for performing protocol updates and system management.
- C. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
- D. The PFE handles all processes that control the chassis components.
Answer: A,C
Explanation:
The Packet Forwarding Engine (PFE) in Juniper Networks devices is the heart of the data plane, handling the actual forwarding of packets based on pre-computed forwarding tables. It provides several critical services to manage and control traffic flow, including policing (to enforce bandwidth limits for certain traffic types), stateless firewall filtering (to permit or deny traffic based on predefined criteria), and Class of Service (CoS) (to prioritize traffic to ensure quality of service for critical applications). The PFE utilizes both Layer 2 (MAC addresses) and Layer 3 (IP addresses) forwarding tables to make intelligent forwarding decisions, ensuring that packets are efficiently routed toward their final destination.
NEW QUESTION # 63
Which two statements apply to the Routing Engine functions? (Choose two.)
- A. It responds to ping and traceroute commands.
- B. It maintains the routing tables.
- C. It processes the transit traffic.
- D. It does not process routing updates.
Answer: A,B
Explanation:
The Routing Engine (RE) in Juniper Networks devices plays a critical role in the control plane operations. One of its functions includes responding to network utility commands like ping and traceroute, which are essential for diagnosing network connectivity and path issues. Furthermore, the RE is responsible for maintaining the routing tables, which contain information about network paths and destinations. These tables are vital for making forwarding decisions but are distinct from the actual forwarding of packets, which is handled by the Packet Forwarding Engine (PFE).
NEW QUESTION # 64
Which two common routing policy actions affect the flow of policy evaluation? (Choose two.)
- A. next policy
- B. community
- C. next hop
- D. next term
Answer: A,D
Explanation:
In Junos OS routing policy evaluation, "next policy" (A) and "next term" (C) are common actions that affect the flow of policy evaluation. "Next policy" directs the evaluation to the next policy in the sequence, whereas "next term" moves the evaluation to the next term within the current policy, allowing for granular control over routing decisions.
NEW QUESTION # 65
Your router has a route to the 10.1.1.0/24 network with a next hop of r jet.
In this scenario, which action will your router perform when traffic destined to the 10.1.1.0/24 network is received?
- A. The traffic will be redirected using a default route.
- B. The traffic will be discarded and an ICMP unreachable message will be sent to the source of the traffic.
- C. The traffic will be discarded and an ICMP unreachable message will be sent to the destination of the traffic.
- D. The traffic will be silently discarded.
Answer: D
Explanation:
In a scenario where a router has a route to a specific network (in this case, 10.1.1.0/24) with a next hop that is unreachable or incorrectly specified (e.g., "r jet" seems to be a typo or an undefined entity), the router will typically discard the traffic destined for that network. This action is taken because the router cannot determine a valid path to forward the traffic. Unlike some scenarios where the router might generate an ICMP (Internet Control Message Protocol) unreachable message, in many configurations, especially in production networks, the traffic might be silently discarded without providing feedback to the sender, as generating ICMP messages for all undeliverable packets could lead to additional network congestion and potential security concerns.
NEW QUESTION # 66
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 cannot enter configuration mode.
- B. Other users can enter configuration mode.
- C. The candidate configuration is unlocked.
- D. The candidate configuration is locked.
Answer: A
Explanation:
When a user enters configuration mode using theconfigure exclusivecommand on a Junos device, the candidate configuration is locked for that user, preventing other users from making concurrent configuration changes. This exclusive lock ensures that only one user can make changes at a time, preventing conflicts and potential errors from simultaneous modifications. Other users attempting to enter configuration mode while it is locked will receive a notification that the configuration is currently being edited by another user.
NEW QUESTION # 67
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 source address of 10.10.10.1.
- B. The telnet session will have a source address of 192.168.100.1.
- C. The telnet session will have a destination address of 192.168.100.1.
- D. The telnet session will have a destination address of 10.10.10.1.
Answer: B,D
Explanation:
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.
NEW QUESTION # 68
By default, how does the PFE manage unicast traffic destined for an existing forwarding table entry?
- A. It sends all traffic to the control plane for further processing.
- B. It sends the traffic through multiple ports toward its destination.
- C. It sends the traffic through one port toward its destination.
- D. It sends the traffic through the f xpl interface to the RE.
Answer: C
Explanation:
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.
NEW QUESTION # 69
You want to redeploy a Junos device by clearing the existing configuration and resetting it to factory defaults.
In this scenario, which command would help to accomplish this task?
- A. request systemstorage cleanup dry-run
- B. show system storage
- C. request systemzeroize media
- D. request systemstorage cleanup
Answer: C
Explanation:
Therequest system zeroize mediacommand on a Junos device securely erases all data, including configuration and log files, and resets the device to its factory default settings. This command is used when redeploying a device to ensure no residual data remains from its previous deployment. It's a comprehensive and secure way to clear all configurations and data, making the device as if it were new. The other commands listed do not perform a full reset to factory defaults; for example,show system storagedisplays storage information, andrequest system storage cleanupoffers to delete unnecessary files without resetting the device to factory settings.
NEW QUESTION # 70
How many rescue configuration files are supported on a Junos device?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
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 # 71
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. show interface ge-0/0/0
- C. run show interface terse
- D. request system shutdown
Answer: B,D
Explanation:
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.
NEW QUESTION # 72
Which protocol is responsible for learning an IPv4 neighbor's MAC address?
- A. Network Address Translation (NAT)
- B. Address Resolution Protocol (ARP)
- C. Media Access Control Security (MACsec)
- D. Neighbor Discovery Protocol (NDP)
Answer: B
Explanation:
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.
References:
* Juniper official documentation: ARP.
* Networking standards: RFC 826.
NEW QUESTION # 73
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