JN0-281 Premium Files Updated Feb-2026 Practice Valid Exam Dumps Question [Q82-Q101]

JN0-281 Juniper

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JN0-281 Premium Files Updated Feb-2026 Practice Valid Exam Dumps Question [Q82-Q101]

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JN0-281 Premium Files Updated Feb-2026 Practice Valid Exam Dumps Question

Practice with JN0-281 Dumps for JNCIA-DC Certified Exam Questions & Answer

NEW QUESTION 82
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

NEW QUESTION 83
What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?

They redistribute routes between OSPF and non-OSPF networks.

They are responsible for generating LSAs for external routes.

They reduce the number of adjacencies on broadcast networks.

They determine the shortest path first algorithm.

NEW QUESTION 84
What is the definition of a trunk interface on a switch?

An interface that carries multiple VLANs.

An interface that carries high bandwidth.

An interface that connects directly to powerful servers.

An interface that carries excess traffic.

A trunk interface on a switch is used to carry traffic for multiple VLANs between switches or between a switch and another network device, like a router. Trunk interfaces use 802.1Q tagging to identify which VLAN the traffic belongs to.
Step-by-Step Breakdown:
Trunk Ports:
Trunk ports are typically used for inter-switch links or switch-to-router links where multiple VLANs need to be carried over the same physical connection.
VLAN traffic is tagged with a VLAN ID to ensure that it is properly identified as it crosses the trunk link.
802.1Q VLAN Tagging:
Trunk ports use 802.1Q to tag Ethernet frames with the VLAN ID. This ensures that frames are correctly forwarded to the appropriate VLANs on the other side of the trunk.
Juniper Reference:
Trunk Interface Configuration: In Juniper switches, trunk ports are configured to carry tagged traffic for multiple VLANs, which is essential for interconnecting multiple network segments.

NEW QUESTION 85
What is the default route preference of a static route in the Junos OS?

In Junos OS, the default route preference for a static route is 5. Route preference values are used to determine which route should be installed in the routing table when multiple routes to the same destination are available.
Step-by-Step Breakdown:
Static Route Preference:
A static route, by default, has a preference of 5, making it a highly preferred route. Lower preference values are more preferred in Junos, meaning static routes take precedence over most dynamic routing protocol routes, such as OSPF (preference 10) or BGP (preference 170).
Route Preference:
Route preference is a key factor in the Junos routing decision process. Routes with lower preference values are preferred and installed in the forwarding table.
Juniper Reference:
Static Routes: In Junos, the default preference for static routes is 5, making them more preferred than most dynamic routes.

NEW QUESTION 86
Which two statements are correct about aggregate routes and generated routes? (Choose two.)

An aggregate route does not have a forwarding next hop.

An aggregate route has a forwarding next hop.

A generated route has a forwarding next hop.

A generated route does not have a forwarding next hop.

Aggregate routes and generated routes are used to create summarized routes in Junos, but they behave differently in terms of forwarding.
Step-by-Step Breakdown:
Aggregate Routes:
An aggregate route summarizes a set of more specific routes, but it does not have a direct forwarding next hop. Instead, it points to the more specific routes for actual packet forwarding.
Generated Routes:
A generated route also summarizes specific routes, but it has a forwarding next hop that is determined based on the availability of contributing routes. The generated route can be used to directly forward traffic.
Juniper Reference:
Aggregate and Generated Routes: In Junos, aggregate routes rely on more specific routes for forwarding, while generated routes can forward traffic directly based on their next-hop information.

NEW QUESTION 87
What are two device roles in a five-member Virtual Chassis? (Choose two.)

PFE

Control-board

Line card

Routing-engine

In a Virtual Chassis (VC) configuration, multiple Juniper switches are interconnected to form a single logical device. Each member switch in the Virtual Chassis plays a specific role.
Step-by-Step Breakdown:
Line Card Role:
Member switches acting as line cards provide additional ports for traffic forwarding but do not perform control or routing functions. These switches depend on the routing engine to handle control-plane tasks.
Routing Engine Role:
A switch in the routing-engine role is responsible for control-plane operations such as routing protocol management and control of the Virtual Chassis.
Virtual Chassis Roles:
Master Routing Engine: Handles control-plane functions and manages the entire Virtual Chassis.
Backup Routing Engine: Takes over if the master fails.
Line Card: Provides additional ports and handles data-plane operations.
Juniper Reference:
Virtual Chassis: In a five-member Virtual Chassis, multiple switches act as line cards, while one or more switches are designated as the routing engines (master and backup).

NEW QUESTION 88
Which of the following BGP attributes is considered first in the route selection process?

Local Preference

AS Path Length

Origin

MED

NEW QUESTION 89
When configuring High Availability components, which of the following practices are recommended? (Choose two)

Regularly update firmware to non-recommended versions.

Ensure physical redundancy of critical components.

Use a single path for data and control traffic.

Implement regular testing of failover mechanisms.

NEW QUESTION 90
Exhibit:

Referring to the exhibit, which statement is correct?

The configuration will commit successfully and BGP group 1 will operate as IBGP.

The configuration will commit successfully and BGP group 1 will operate as EBGP.

BGP group 1 requires a type external parameter.

BGP group 1 requires a type internal parameter.

In the exhibit, BGP is configured with local AS 65101 and a neighbor at 172.16.1.1 in peer AS 65201. This setup involves two different Autonomous Systems (AS), indicating an External BGP (EBGP) configuration.
Step-by-Step Breakdown:
EBGP vs. IBGP:
EBGP is used between routers in different ASes. In this case, the local AS is 65101 and the peer AS is 65201, meaning the BGP session is EBGP.
IBGP is used between routers within the same AS, which is not applicable here as the AS numbers are different.
BGP Group Configuration:
The configuration does not require a type external parameter because Junos OS automatically recognizes the session as EBGP when the local and peer AS numbers are different.
The BGP session will operate as EBGP, and the configuration will commit successfully.
Juniper Reference:
BGP Configuration: In Juniper, EBGP is automatically recognized when the local and peer AS numbers differ, without needing to specify type external.

NEW QUESTION 91
MACsec provides protection against which two types of threats? (Choose two.)

Data decryption

Playback attacks

Hashing attacks

Man-in-the-middle attack

MACsec (Media Access Control Security) provides data confidentiality, integrity, and origin authenticity at Layer 2, protecting against several types of threats.
Step-by-Step Breakdown:
Man-in-the-Middle Attack Protection:
MACsec encrypts traffic at Layer 2, preventing man-in-the-middle attacks where an attacker intercepts and manipulates traffic between two communicating devices. Since the data is encrypted, any intercepted packets are unreadable.
Protection Against Playback Attacks:
MACsec also protects against playback attacks by using sequence numbers and timestamps to ensure that old, replayed packets are not accepted by the receiver. Juniper Reference: MACsec Configuration: Juniper devices support MACsec for securing Layer 2 communications, ensuring protection against replay and man-in-the-middle attacks in sensitive environments.

NEW QUESTION 92
Which three actions are required to implement filter-based forwarding? (Choose three.)

You must create an instance-type forwarding routing instance.

You must create an instance-type vrf routing instance.

You must create a match filter.

You must create a security policy.

You must create a RIB group.

Filter-Based Forwarding (FBF) in Junos OS allows traffic to be routed based on specific criteria such as source address, rather than just the destination address. This is useful in scenarios like policy routing or providing multiple paths for different types of traffic. Step-by-Step Breakdown:
Instance-Type Forwarding:
You must create an instance-type forwarding routing instance. This routing instance allows for different routing tables based on the incoming packet filter.
Command:
set routing-instances FBF-instance instance-type forwarding Match Filter:
You need to create a filter to match the traffic that will be forwarded according to your custom routing policy. This filter is applied to an interface to determine which traffic will use the custom forwarding instance.
Command Example:
set firewall family inet filter FBF-filter term 1 from source-address <address> set firewall family inet filter FBF-filter term 1 then routing-instance FBF-instance RIB Group:
A RIB (Routing Information Base) group is necessary to share routes between the primary routing table and the custom routing instance. This allows FBF traffic to use the routing information from other routing tables.
Command Example:
set routing-options rib-groups FBF-group import-rib inet.0
set routing-instances FBF-instance routing-options rib-group FBF-group
Juniper
Reference: FBF Configuration: Filter-based forwarding requires these specific steps to redirect traffic to a custom routing table based on filter criteria.

NEW QUESTION 93
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.

In a three-stage IP fabric (also known as a Clos fabric), traffic between any two points (ingress to egress) in the fabric is only 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 94
Referring to the exhibit, how many milliseconds will pass before the BGP neighbor is considered dead?

1000ms

9000ms

2000ms

3000ms

NEW QUESTION 95
Which of the following VLAN port modes exist in Junos OS? (Choose two)

Tunnel

Access

Trunk

Aggregated

NEW QUESTION 96
Bidirectional Forwarding Detection (BFD) is primarily used for:

Encrypting data packets

Detecting slow links in the network

Quick failure detection in forwarding paths

Aggregating multiple links

NEW QUESTION 97
What information in the Ethernet header is used to populate the bridging table?

destination address

source address

type

protocol

The source MAC address in the Ethernet header is used to populate the bridging table (also called the MAC address table) on a switch. When a frame arrives at a switch, the switch examines the source MAC address and records it along with the ingress port in its MAC address table.
Step-by-Step Breakdown:
Learning Process:
When an Ethernet frame arrives on a switch port, the switch looks at the source MAC address and adds this MAC address to the MAC table along with the port it was received on. This process is called MAC learning.
Purpose:
The switch uses this information to determine the correct port to send frames destined for that MAC address in future transmissions, thus ensuring efficient Layer 2 forwarding. Juniper Reference: Ethernet Switching: Juniper switches use source MAC addresses to build and maintain the MAC address table, which is essential for Layer 2 switching.

NEW QUESTION 98
Which two statements are correct about aggregate routes and generated routes? (Choose two.)

An aggregate route does not have a forwarding next hop.

An aggregate route has a forwarding next hop.

A generated route has a forwarding next hop.

A generated route does not have a forwarding next hop.

Aggregate routes and generated routes are used to create summarized routes in Junos, but they behave differently in terms of forwarding.
Step-by-Step Breakdown:
Aggregate Routes:
An aggregate route summarizes a set of more specific routes, but it does not have a direct forwarding next hop. Instead, it points to the more specific routes for actual packet forwarding.
Generated Routes:
A generated route also summarizes specific routes, but it has a forwarding next hop that is determined based on the availability of contributing routes. The generated route can be used to directly forward traffic.
Juniper
Reference: Aggregate and Generated Routes: In Junos, aggregate routes rely on more specific routes for forwarding, while generated routes can forward traffic directly based on their next-hop information.

NEW QUESTION 99
What are the different OSPF area types? (Choose two)

Stub Area

Not-So-Stubby Area (NSSA)

Default-Free Zone

Virtual Link Area

NEW QUESTION 100
Which statement is correct about areas in OSPF?

An OSPF area is used to segment Layer 2 broadcast domains.

OSPF areas are used to isolate the effects of a broadcast storm.

OSPF areas are used to reduce the size of the link-state database.

An OSPF area is used to signify the autonomous system to which each device belongs.

In OSPF (Open Shortest Path First), areas are used to segment a network into smaller, more manageable pieces to improve scalability. By dividing a network into areas, OSPF can reduce the size of the link-state database (LSDB), which helps routers process updates more efficiently.
Step-by-Step Breakdown:
Purpose of OSPF Areas:
OSPF areas allow for hierarchical routing within the OSPF domain. Routers in the same area have identical LSDBs, but routers in different areas do not exchange full link-state information. Instead, they exchange summarized routes, which reduces the LSDB size and CPU/memory usage.
Benefits:
Reducing the LSDB size improves scalability and ensures faster convergence in larger networks. Area 0 is the backbone area, and all other areas must connect to it, forming a hierarchical structure.
Juniper Reference:
OSPF Configuration: Areas in OSPF are configured to optimize network performance by limiting the scope of link-state advertisements (LSAs) to within an area.

NEW QUESTION 101
What are two reasons why you would deploy an IP fabric instead of a traditional Layer 2 network in a data center? (Choose two.)

Layer 2 networks only support a single broadcast domain.

IP fabrics are better suited to smaller networks where scale is less important.

Layer 3 networks support load balancing.

Layer 2 networks are susceptible to loops.

IP fabrics are Layer 3-centric network designs often used in data centers due to their scalability, efficient routing, and loop-free architecture.
Step-by-Step Breakdown:
Layer 3 Load Balancing:
IP fabrics use Equal-Cost Multipath (ECMP) to distribute traffic across multiple paths, providing effective load balancing and improving bandwidth utilization. This capability is absent in traditional Layer 2 networks, which do not support ECMP for routing decisions.
Layer 2 Loops:
Layer 2 networks are prone to loops because of the lack of TTL (Time-to-Live) mechanisms. Spanning Tree Protocol (STP) is required to prevent loops, but it can introduce inefficiencies by blocking links. In contrast, IP fabrics based on Layer 3 protocols are loop-free and do not need STP. Juniper Reference: IP Fabric: Juniper’s IP fabric solutions offer efficient Layer 3 routing with built-in load balancing and loop prevention, making them ideal for modern data center architectures.

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JN0-281 Premium Files Updated Feb-2026 Practice Valid Exam Dumps Question [Q82-Q101]

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