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2025 Juniper Authoritative JN0-280: Data Center, Associate (JNCIA-DC) Practice Questions

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The JN0-280 Exam covers a range of topics related to data center networking, including data center architecture, Ethernet switching, VLANs, Spanning Tree Protocol, and link aggregation. It also covers Juniper Networks devices and technologies, including Junos OS, virtual chassis technology, and Juniper Networks QFabric system.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q116-Q121):

NEW QUESTION # 116
What are two characteristics of a typical EBGP underlay fabric? (Choose two.)

A. Each device in an EBGP fabric will be configured to be part of the same private AS.
B. An EBGP fabric relies on an IGP to advertise loopback IPs.
C. An EBGP fabric does not require an IGP to advertise loopback IPs.
D. Each device in an EBGP fabric will be configured in its own unique private AS.

Answer: C,D

NEW QUESTION # 117
You want to enable a Junos device to support aggregated Ethernet interfaces. In this scenario, which configuration hierarchy would you use?

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

Answer: A

Explanation:
To configureaggregated Ethernet (AE) interfaceson a Junos device, the configuration is done under the[edit chassis]hierarchy.
Step-by-Step Breakdown:
* Chassis Configuration:Thechassisconfiguration 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: Thechassishierarchy is used to allocate and manage hardware resources for aggregated Ethernet interfaces in Juniper devices.

NEW QUESTION # 118
BGP is primarily used for which purpose in a network?

A. Encrypting data traffic between networks
B. Connecting different autonomous systems and route sharing
C. Internal routing within a single autonomous system
D. Providing Layer 2 connectivity

Answer: B

NEW QUESTION # 119
Which statement is correct about a three-stage IP fabric underlay?

A. Every spine device can communicate directly with other spine devices.
B. Every ingress interface into the fabric is only two hops away from the egress interface.
C. Every leaf device can communicate directly with other leaf devices.
D. Every server that connects to a three-stage IP fabric must be multihomed.

Answer: B

Explanation:
In athree-stage IP fabric(also known as a Clos fabric), traffic between any two points (ingress to egress) in the fabric isonly two hops away.
Step-by-Step Breakdown:
* Three-Stage IP Fabric:
* Leaf Layer: Leaf switches connect directly to servers and edge devices.
* Spine Layer: Spine switches provide connectivity between leaf switches but do not connect to each other directly.
* Two-Hop Communication:In this architecture, every leaf switch is connected to every spine switch.
Therefore, when a packet enters the fabric via an ingress leaf switch, it is forwarded to a spine switch, which then directs the packet to the correct egress leaf switch. This path always involves exactly two hops:
* Ingress leaf # Spine # Egress leaf.
* Benefits:This consistent two-hop path ensures predictable latency and makes the network highly scalable while maintaining low complexity.
Juniper Reference:
* IP Fabric Architecture: This two-hop property of Clos fabrics is a hallmark of spine-leaf designs, as supported by Juniper's QFX and EX switches in data centers.

NEW QUESTION # 120
Which BGP message type is used to establish peering sessions?

A. Keepalive
B. Notification
C. Open
D. Update

Answer: C

NEW QUESTION # 121
......

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