New 2025 Realistic JN0-280 Dumps Test Engine Exam Questions in here [Q107-Q126]

Posted On September 18, 2025

New 2025 Realistic JN0-280 Dumps Test Engine Exam Questions in here

Updated Official licence for JN0-280 Certified by JN0-280 Dumps PDF

Q107. Which two statements are correct about EVPN-VXLAN overlay networking? (Choose two.)

It is the only option to provide reachability between servers that reside in the same network segment in a data center.

BGP provides the control plane within the overlay network.

An encapsulation of the original packet is required to transport the packet across the network.

OSPF provides the control plane within the overlay network.

Q108. Which of the following are functions of MACsec? (Choose two)

It provides Layer 2 encryption.

It prevents MAC flooding attacks.

It offers data integrity and confidentiality.

It enables VLAN tagging.

Q109. VLANs help in reducing which of the following? (Choose two)

Collision domains

Broadcast domains

Routing complexity

Encryption requirements

Q110. Referring to the exhibit, which statement is true?

BFD will bring down the BGP session if no BFD packets are received for 2700 seconds.

BFD packets are being sent every second.

BFD will bring down the BGP session if no BFD packets are received for 2700 milliseconds.

BFD only records a syslog message if three BFD packets are missed.

Q111. What protocol and port does BGP use for control plane communication?

protocol TCP, port 179

protocol UDP, port 179

protocol TCP, port 159

protocol UDP, port 159

Q112. When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)

The BFD default minimum interval is 3.

You can configure BFD per interface within the protocol stanza.

The BFD operation always consists of minimum intervals and multipliers.

The BFD default multiplier is 5.

Q113. Which Junos OS routing table stores IPv6 addresses?

inet.0

inet0.6

inet.6

inet6.0

Q114. Exhibit:

Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?

2000 seconds

400 milliseconds

400 seconds

2000 milliseconds

Q115. During a BGP Graceful Restart, what happens to the routes learned from the restarting neighbor?

They are immediately removed from the routing table.

They are marked as stale but kept in the routing table.

They are advertised to other BGP neighbors.

Their metric is increased to prevent their use.

Q116. Referring to the exhibit, which two statements are correct about the IP fabric? (Choose two.)

Only traffic between pods must traverse the super spine devices.

All traffic must traverse the super spine devices.

This is a three-stage IP fabric.

This is a five-stage fabric.

Q117. When configuring OSPF, what is the purpose of defining areas?

To specify different encryption methods.

To control route advertisement and manage traffic.

To assign different IP address ranges.

To provide network redundancy.

Q118. You have configured a load balancing policy.
Which statement is correct about applying the policy?

The policy is applied as an export policy under the routing protocol s hierarchy.

The policy is applied as an export policy under routing-options forwarding table.

The policy is applied as an import policy under the routing protocol s hierarchy.

The policy is applied as an import policy under routing-options forwarding table.

Q119. In the context of data center networking, what is the primary purpose of an Underlay Network?

To provide a physical infrastructure for an Overlay Network.

To handle external network connections exclusively.

To facilitate virtual machine migrations.

To encrypt data traffic between servers.

Q120. Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Q121. Which two statements are true with regards to MACsec?

It provides authentication for an Ethernet traffic between two network nodes.

It does not provide encryption for an Ethernet traffic between two network nodes.

It does not provide authentication for an Ethernet traffic between two network nodes.

It provides encryption for an Ethernet traffic between two network nodes.

Q122. In a Virtual Chassis configuration, which of the following is true?

It allows physical stacking of switches that are geographically dispersed.

It reduces the operational complexity of managing multiple switches.

It decreases network redundancy and reliability.

Only two switches can be connected in a Virtual Chassis setup.

Q123. Leaf and spine data centers are used to better accommodate which type of traffic?

north-east

east-west

north-west

south-east

In modern data centers, the shift toward leaf-spine architectures is driven by the need to handle increased east- west traffic, which is traffic between servers within the same data center. Unlike traditional hierarchical data center designs, where most traffic was “north-south” (between users and servers), modern applications often involve server-to-server communication (east-west) to enable services like distributed databases, microservices, and virtualized workloads.
Leaf-Spine Architecture:
* Leaf Layer: This layer consists of switches that connect directly to servers or end-host devices. These switches serve as the access layer.
* Spine Layer: The spine layer comprises high-performance switches that provide interconnectivity between leaf switches. Each leaf switch connects to every spine switch, creating a non-blocking fabric that optimizes traffic flow within the data center.
East-West Traffic Accommodation:
In traditional three-tier architectures (core, aggregation, access), traffic had to traverse multiple layers, leading to bottlenecks when servers communicated with each other. Leaf-spine architectures address this by creating multiple equal-cost paths between leaf switches and the spine. Since each leaf switch connects directly to every spine switch, the architecture facilitates quick, low-latency communication between servers, which is essential for east-west traffic flows.
Juniper’s Role:Juniper Networks provides a range of solutions that optimize for east-west traffic in a leaf- spine architecture, notably through:
* QFX Series Switches: Juniper’s QFX series switches are designed for the leaf and spine architecture, delivering high throughput, low latency, and scalability to accommodate the traffic demands of modern data centers.
* EVPN-VXLAN: Juniper uses EVPN-VXLAN to create a scalable Layer 2 and Layer 3 overlay network across the data center. This overlay helps enhance east-west traffic performance by enabling network segmentation and workload mobility across the entire fabric.
Key Features That Support East-West Traffic:
* Equal-Cost Multipath (ECMP): ECMP enables the use of multiple paths between leaf and spine switches, balancing the traffic and preventing any one path from becoming a bottleneck. This is crucial in handling the high volume of east-west traffic.
* Low Latency: Spine switches are typically high-performance devices that minimize the delay between leaf switches, which improves the efficiency of server-to-server communications.
* Scalability: As the demand for east-west traffic grows, adding more leaf and spine switches is straightforward, maintaining consistent performance without redesigning the entire network.
In summary, the leaf-spine architecture is primarily designed to handle the increase ineast-west trafficwithin data centers, and Juniper provides robust solutions to enable this architecture through its switch platforms and software solutions like EVPN-VXLAN.

Q124. What does filter-based forwarding in networking typically allow?

Forwarding decisions based on MAC addresses

Load balancing across multiple CPUs

Routing decisions based on extended criteria like packet headers

Aggregation of multiple routes into a single entry

Q125. Which statement is correct about a three-stage IP fabric underlay?

Every ingress interface into the fabric is only two hops away from the egress interface.

Every spine device can communicate directly with other spine devices.

Every leaf device can communicate directly with other leaf devices.

Every server that connects to a three-stage IP fabric must be multihomed.

Q126. Which two statements are true about how switches handle Layer 2 traffic? (Choose two.)

The MAC address is learned based on the destination MAC address.