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Juniper JN0-105 Exam Syllabus Topics:
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NEW QUESTION # 57
Which statement is correct when multiple users are configuring a Junos device using the configure private command?
- A. Each user gets their own candidate configuration.
- B. A commit by any user will commit changes made by all active users.
- C. Each user shares the same candidate configuration.
- D. A commit will not succeed until there is only a single user in configuration mode.
Answer: A
Explanation:
When multiple users are configuring a Junos device using the "configure private" command, each user gets their own candidate configuration (C). This allows for isolated configuration sessions, where changes made by one user do not impact or interfere with the changes made by another user in their private session.
NEW QUESTION # 58
Which command displays all IPv6 routes in the default routing instance?
- A. showroute table inet6.1
- B. showroute table inet.0
- C. showroute table inet.l
- D. showroute table inet6.0
Answer: D
Explanation:
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.
NEW QUESTION # 59
Which criteria does the Junos OS use to select an active route when two entries exist in the routing table?
- A. the route with the highest preference number
- B. the most recently learned dynamic route
- C. the route with the lowest preference number
- D. the route with the highest metric
Answer: C
Explanation:
In Junos OS, when two entries for the same destination exist in the routing table, the route with the lowest preference number is selected as the active route. This preference number, also known as the route preference or administrative distance, is used to prioritize routes received from different routing protocols.
NEW QUESTION # 60
You are logged in to a Junos OS device with SSH and issued the show protocols | compare command in the configuration, but no output is shown.
Which statement is correct in this scenario?
- A. Someone accidentally deleted the active configuration.
- B. You must commit the configuration before any output will be shown.
- C. The command only works for interface configuration differences.
- D. There are no changes to the candidate configuration.
Answer: D
Explanation:
If issuing the "show | compare" command in configuration mode yields no output, it indicates that there are no changes to the candidate configuration (B). This command is used to compare the current candidate configuration with the active configuration, and a lack of output suggests that the candidate configuration matches the active one, meaning no changes have been made or the changes have already been committed.
NEW QUESTION # 61
Which process in the Junos OS is responsible for device management tasks including the CLI and commit operations?
- A. chassisd
- B. rpd
- C. dcd
- D. mgd
Answer: D
Explanation:
In Junos OS, the management daemon (mgd) is responsible for handling all the device management tasks, including processing CLI commands and handling commit operations. The mgd daemon interacts with the Junos OS configuration database and provides the necessary logic to ensure that configuration changes are syntactically correct and do not conflict with each other. When a user commits a configuration, mgd validates the changes, applies them to the running configuration, and ensures that the necessary daemons are notified of the changes to apply them accordingly.
NEW QUESTION # 62
Which service does RADIUS provide?
- A. DNS resolution
- B. routing
- C. authentication
- D. time synchronization
Answer: C
Explanation:
RADIUS, which stands for Remote Authentication Dial-In User Service, provides authentication services for users trying to access a network. It is a networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA) management for users who connect and use a network service.
NEW QUESTION # 63
What is the maximum number of rollback configuration files that the Junos OS will store?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
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
NEW QUESTION # 64
Which type of device uses the destination IP address to forward packets?
- A. Layer 3 router
- B. hub
- C. repeater
- D. Layer 2 switch
Answer: A
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 # 65
Which two addresses are included in an Ethernet frame header? (Choose two.)
- A. source MAC address
- B. source IP address
- C. destination MAC address
- D. destination IP address
Answer: A,C
Explanation:
An Ethernet frame header includes the source MAC address (B) and the destination MAC address (D). These addresses are used to deliver the frame from one Ethernet device to another directly connected Ethernet device on the same network segment. Ethernet frames do not include IP addresses, as those are part of the IP packet encapsulated within the Ethernet frame.
NEW QUESTION # 66
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. instance
- C. route-filter
- D. neighbor
Answer: C
Explanation:
When creating a policy to accept and redistribute routes into your IGP, "route-filter" (D) is the match criteria used to identify specific route prefixes. Route filters enable you to specify which routes should be accepted, rejected, or modified based on their attributes, such as prefix length or value.
NEW QUESTION # 67
Which two statements are true about the PFE? (Choose two.)
- A. The PFE is responsible for performing protocol updates and system management.
- B. The PFE handles all processes that control the chassis components.
- C. The PFE implements various services such as policing, stateless firewall filtering, and class of service.
- D. The PFE uses Layer 2 and Layer 3 forwarding tables to forward traffic toward its destination.
Answer: C,D
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 # 68
Which two statements are true about the Junos OS? (Choose two.)
- A. Routing tables are stored in the control plane.
- B. Exception traffic is never sent to the control plane.
- C. Exception traffic is sent to the control plane.
- D. Routing tables are stored in the forwarding plane.
Answer: A,C
Explanation:
In Junos OS, as with many network operating systems, the control plane is responsible for processes that determine how to route traffic. This includes maintaining routing tables, which store information about network paths and protocols. Therefore, routing tables are indeed stored in the control plane.
Exception traffic refers to packets that cannot be processed by the normal fast-path processing of the Packet Forwarding Engine (PFE) in the forwarding plane, and thus are sent to the control plane for further processing. This might include packets destined for the router itself, packets that need to be fragmented, or packets that match certain firewall filter criteria, among other reasons.
Routing tables are not stored in the forwarding plane. However, the forwarding plane contains the forwarding table (sometimes referred to as the forwarding information base or FIB), which is a distilled version of the routing table optimized for fast packet forwarding. The forwarding plane uses this information to perform the actual transfer of packets across the network device interfaces.
NEW QUESTION # 69
Which prompt indicates that you are using configuration mode?
- A. $
- B. %
- C. #
- D. >
Answer: C
Explanation:
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."
NEW QUESTION # 70
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 # 71
What are two examples of exception traffic? (Choose two.)
- A. transit packets
- B. routing updates
- C. ping to the local device
- D. log messages
Answer: B,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 # 72
Which two statements apply to the Routing Engine functions? (Choose two.)
- A. It maintains the routing tables.
- B. It processes the transit traffic.
- C. It responds to ping and traceroute commands.
- D. It does not process routing updates.
Answer: A,C
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 # 73
Which two statements are correct about a Routing Engine? (Choose two.)
- A. It forwards transit traffic.
- B. It processes CoS marked traffic.
- C. It processes management traffic.
- D. It maintains routing tables.
Answer: C,D
Explanation:
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.
NEW QUESTION # 74
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