Question # 1
| When considering routing tables and forwarding tables, which two statements are correct? (Choose two.) |
| A. The routing table is used by the RE to select the best route. | | B. The forwarding table stores all routes and prefixes from all protocols. | | C. The forwarding table is used by the RE to select the best route. | | D. The routing table stores all routes and prefixes from all protocols. |
A. The routing table is used by the RE to select the best route.
D. The routing table stores all routes and prefixes from all protocols.
Explanation:
The routing table and forwarding table play distinct roles in a Junos OS device. The correct answers are A and D. The routing table (A) is used by the Routing Engine (RE) to select the best route among all the learned routes, while the routing table (D) stores all routes and prefixes learned from all routing protocols. The forwarding table, in contrast, contains only the active routes chosen by the RE and is used by the Packet Forwarding Engine for actual packet forwarding.
Question # 2
| 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 an NTP server. | | C. Configure a DNS server. | | D. Reboot the device. |
A. Set the date and time setting manually.
B. Configure an NTP server.
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.
Question # 3
| 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. monitor traffic interface ge-0/0/0 | | C. show interfaces ge-0/0/0 terse | | D. show interfaces ge-0/0/0 |
D. show interfaces ge-0/0/0
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.
Question # 4
| Which service does RADIUS provide? |
| A. routing | | B. authentication | | C. DNS resolution | | D. time synchronization |
B. authentication
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.
Question # 5
| 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 routing-engine | | D. show chassis location |
B. show chassis hardware
Explanation:
The show chassis hardware command 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.
Question # 6
| Which statement is correct concerning exception traffic processing? |
| A. Exception traffic is always dropped during congestion. | | B. Exception traffic is rate-limited to protect the RE. | | C. Exception traffic is discarded by the PFE. | | D. Exception traffic is never forwarded. |
B. Exception traffic is rate-limited to protect the RE.
Explanation:
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.
Question # 7
| 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. Enter and commit the new root password. | | B. Load the factory-default configuration. | | C. Upgrade the Junos OS to the latest version. | | D. Hit the space bar and enter recovery when prompted. | | E. Use a console connection to reboot the device. |
A. 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.
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.
Question # 8
| What are two functions of the routing protocol daemon (rpd)? (Choose two.) |
| A. It generates chassis alarms. | | B. It provides access to the CLI. | | C. It creates forwarding tables. | | D. It maintains routing tables. |
C. It creates forwarding tables.
D. It maintains routing tables.
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.
Question # 9
| 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. |
C. Data in the ospf-trace file is removed and logging continues.
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.
Question # 10
| 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 static route | | B. a local route | | C. a dynamic route | | D. a direct route |
B. a local route
D. a direct route
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.
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Junos - Associate (JNCIA-Junos) Exam Dumps
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