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100% Pass 2025 Juniper JN0-281: Data Center, Associate (JNCIA-DC) Valid Exam Guide

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q21-Q26):

NEW QUESTION # 21
You are configuring an aggregate route. In this scenario, which two statements are correct? (Choose two.)

A. Discard will send an ICMP Destination Unreachable message back to the sender.
B. Discard will silently drop the traffic.
C. Reject will send an ICMP Destination Unreachable message back to the sender.
D. Reject will silently drop the traffic.

Answer: B,C

Explanation:
When configuring an aggregate route, you have options for how to handle traffic that matches the route but does not match any more specific route in the routing table.
Two actions can be taken:
discard and reject.
Step-by-Step Breakdown:
Discard:
The discard option will silently drop packets that match the aggregate route. No notification is sent to the sender, and the packet is simply dropped.
Reject:
The reject option will drop the packet and also send an ICMP Destination Unreachable message back to the sender. This informs the sender that the packet could not be delivered because there is no specific route available.
Juniper
Reference: Aggregate Routes: The reject and discard next-hop options provide different levels of feedback when packets cannot be routed, and they can be used to control how unreachable destinations are handled.

NEW QUESTION # 22
Referring to the exhibit, you notice that after committing the configuration, the ae0 and ae1 interfaces appear in a link down state.

Which statement is correct in this scenario?

A. No operational interfaces have been added to the LAG interfaces.
B. The LAG interfaces are in aggressive mode.
C. The LAG interfaces are in a passive state.
D. No traffic is traversing the LAG interfaces.

Answer: A

Explanation:
In the exhibit, the ae0 and ae1 interfaces are in a link down state. This occurs when no physical interfaces (member interfaces) have been added to the LAG (Link Aggregation Group) interfaces, or the member interfaces are not operational.
Step-by-Step Breakdown:
LAG Configuration:
A LAG interface (aggregated Ethernet interface) is a logical interface that combines multiple physical interfaces for redundancy and increased bandwidth. The LAG will only be operational if at least one member interface is active and configured correctly.
No Operational Member Interfaces:
If no member interfaces are added or if the member interfaces are down, the LAG will remain in a down state, as shown in the exhibit for ae0 and ae1. Resolution:
Verify that physical interfaces have been added to the LAG using commands like:
LAG Interface Status: In Juniper, the link status of the LAG depends on its member interfaces, which must be operational for the LAG to function.

NEW QUESTION # 23
Martian addresses are:

A. Addresses used in MPLS.
B. Addresses used for load balancing.
C. Unroutable addresses that are generally filtered by routers.
D. Special routes for interplanetary communication.

Answer: C

NEW QUESTION # 24
You want to enable a Junos device to support aggregated Ethernet interfaces. In this scenario, which configuration hierarchy would you use?

A. [edit switch-options]
B. [edit system]
C. [edit interfaces]
D. [edit chassis]

Answer: D

Explanation:
To configure aggregated Ethernet (AE) interfaces on a Junos device, the configuration is done under the [edit chassis] hierarchy.
Step-by-Step Breakdown:
Chassis Configuration:
The chassis configuration is responsible for enabling the hardware to support Link Aggregation Groups (LAGs), allowing multiple physical interfaces to be bundled into a single logical interface for load balancing and redundancy.
Command Example:
set chassis aggregated-devices ethernet device-count <number>
This command enables a specific number of aggregated Ethernet interfaces on the device.
Juniper
Reference: LAG Configuration in Junos: The chassis hierarchy is used to allocate and manage hardware resources for aggregated Ethernet interfaces in Juniper devices.

NEW QUESTION # 25
How does OSPF calculate the best path to a particular prefix?

A. It finds the path with the numerically lowest cost.
B. It finds the path with the least number of hops.
C. It finds the path with the shortest autonomous system path.
D. It finds the path with the numerically lowest route preference.

Answer: A

Explanation:
OSPF (Open Shortest Path First) calculates the best path based on the cost of the route, which is derived from the bandwidth of the interfaces along the path.
Step-by-Step Breakdown:
OSPF Path Selection:
OSPF assigns a cost to each link, typically based on the link's bandwidth (higher bandwidth equals lower cost).
The OSPF algorithm computes the shortest path to a destination by adding the costs of all links in the path. The path with the numerically lowest total cost is chosen as the best path.
Cost Calculation:
The OSPF cost can be manually adjusted or automatically calculated using the default formula:
Cost=Reference BandwidthLink Bandwidth ext{Cost} = rac{ ext{Reference Bandwidth}}{ ext{Link Bandwidth}}Cost=Link BandwidthReference Bandwidth Juniper Reference:
OSPF Best Path Selection: OSPF selects the path with the lowest cumulative cost, ensuring efficient use of higher-bandwidth links in Junos networks.

NEW QUESTION # 26
......

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