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Free PDF JN0-280 - Data Center, Associate (JNCIA-DC) Useful Brain Exam

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The JNCIA-DC Exam consists of multiple-choice questions that test the candidate's skills in configuring Juniper Networks devices and using the Junos operating system. JN0-280 exam has a duration of ninety minutes, and a passing score of sixty-five percent is required to obtain the certification. JN0-280 Exam is intended for network administrators, technicians, and engineers who have some experience in data center networking and are looking to validate their knowledge.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q20-Q25):

NEW QUESTION # 20
You have configured a load balancing policy.
Which statement is correct about applying the policy?

A. The policy is applied as an export policy under routing-options forwarding table.
B. The policy is applied as an export policy under the routing protocol s hierarchy.
C. The policy is applied as an import policy under the routing protocol s hierarchy.
D. The policy is applied as an import policy under routing-options forwarding table.

Answer: A

NEW QUESTION # 21
You are creating an IP fabric underlay and want to use OSPF as your routing protocol.
In this scenario, which statement is correct?

A. Interface speeds should be the same throughout the fabric to ensure that all links are utilized.
B. All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.
C. All spine devices must use the same router ID.
D. All leaf devices must be configured in separate OSPF areas.

Answer: A

Explanation:
When creating anIP fabric underlayusingOSPFas the routing protocol, consistentinterface speedsare important to ensure optimal traffic distribution and utilization of all links.
Step-by-Step Breakdown:
* OSPF and Interface Speeds:OSPF calculates the cost of a link based on its bandwidth. The default cost calculation in OSPF is:
A black text on a white background Description automatically generated

* If interface speeds vary significantly, OSPF may choose paths with lower cost (higher bandwidth), resulting in some links being underutilized.
* Equal Utilization:To ensure that all links are equally utilized in an IP fabric, it is recommended to maintain uniform interface speeds across the fabric. This ensures balanced load sharing across all available paths.
Juniper Reference:
* IP Fabric with OSPF: Juniper recommends consistent interface speeds to maintain even traffic distribution and optimal link utilization in IP fabric underlay designs.

NEW QUESTION # 22
Which statement is correct about the BGP AS path when advertising routes?

A. The order of the AS path is not significant.
B. The local AS number is added to the beginning of the AS path.
C. The local AS number is added to the end of the AS path.
D. The order of the AS path is only significant in IBGP.

Answer: B

Explanation:
The BGPAS (Autonomous System) pathattribute is crucial in path selection and loop prevention. Each BGP router appends itslocal AS numberto the beginning of the AS path when it advertises a route to an external BGP (eBGP) peer.
Step-by-Step Breakdown:
* AS Path Attribute:The AS path is a sequence of AS numbers that a route has traversed to reach a destination. Each AS adds its number to the front of the path, allowing BGP to track the route's history.
* Why the Local AS is Added at the Beginning:When advertising a route to an eBGP neighbor, a BGP router adds its own AS number to the beginning of the AS path. This ensures that the AS path reflects the route's journey accurately from the origin to the destination, and prevents loops in BGP. If the route returns to the same AS, the router will detect its AS number in the path and reject the route, preventing routing loops.
* Order of the AS Path:The order is significant because BGP uses it to select the best path. A shorter AS path is preferred, as it indicates fewer hops between the source and destination.
Juniper Reference:
* AS Path Attribute: Junos devices append the local AS at the start of the AS path before advertising the route to an external peer.

NEW QUESTION # 23
What is the primary role of an IRB interface in a VLAN configuration?

A. To filter VLAN traffic based on MAC addresses.
B. To prioritize VLAN traffic.
C. To encrypt VLAN traffic.
D. To provide a gateway for VLAN traffic.

Answer: D

NEW QUESTION # 24
Which command on a router is used to view the current routing table?

A. check route information
B. show routing-table
C. display ip routing-table
D. show route

Answer: D

NEW QUESTION # 25
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Biography

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