Question # 1
| 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.
Question # 2
| After the factory default configuration is loaded, which configuration object must be created prior to the first commit? | | A. root authentication | | B. loopback IP address | | C. out-of-band connectivity | | D. host name |
A. root authentication
Explanation:
In Juniper Networks devices, when the factory default configuration is loaded, the first step before committing any configuration is to set up root authentication. This is crucial because it secures the device by ensuring that only authorized users have administrative access. Without setting up a root password, the device will not allow any commit operations, which is a safety measure to prevent unauthorized access. This requirement emphasizes the importance Juniper places on security right from the initial setup of the device.
Question # 3
| Which two statements are correct about a Routing Engine? (Choose two.) | | A. It processes CoS marked traffic. | | B. It forwards transit traffic. | | C. It processes management traffic. | | D. It maintains routing tables. |
C. It processes management traffic.
D. It maintains routing tables.
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.
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
| 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 # 6
| 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 # 7
| 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.
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