JN0-281 Practice Exam Tests Latest Updated on Mar-2026 [Q44-Q66]

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JN0-281 Practice Exam Tests Latest Updated on Mar-2026

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Juniper JN0-281 Exam Syllabus Topics:

Topic	Details
Topic 1	High Availability: This section of the exam measures the skills of a Data Center Reliability Engineer and covers strategies to ensure continuous network availability. It includes features like Link Aggregation Groups (LAG), Graceful Restart (GR), Bidirectional Forwarding Detection (BFD), and Virtual Chassis. It also provides a basic understanding of how to configure, monitor, and troubleshoot each of these high-availability components to maintain resilient network performance.
Topic 2	Layer 2 Switching and VLANs: This section of the exam measuresthe skills of a Network Support Engineer and covers the essential concepts of Layer 2 switching operations within Junos OS. It includes an overview of Ethernet switching and bridging, providing an understanding of how Layer 2 networks function. The section also introduces VLAN concepts, focusing on port modes, VLAN tagging methods, and the purpose of Integrated Routing and Bridging (IRB). It further explores the practical side by addressing how to configure, monitor, and troubleshoot both Layer 2 switching and VLANs.
Topic 3	Protocol-Independent Routing: This section of the exam measures the skills of a Routing Engineer and covers routing features that function independently of any specific protocol. It includes static, aggregate, and generated routes, along with the concept of martian addresses. Routing instances and Routing Information Base (RIB) groups are introduced, as well as techniques like load balancing and filter-based forwarding. Configuration, monitoring, and troubleshooting aspects of these routing components are also covered in this section.
Topic 4	Data Center Routing Protocols BGP OSPF: This section of the exam measures skills of a Network Operations Specialist and covers the operation and key concepts of the OSPF protocol. It explains elements such as the link-state database, OSPF packet types, and router IDs, including how adjacencies and designated routers work within areas. The section then transitions to BGP, outlining its basic operations, message types, attributes, and the path selection process. It also discusses both IBGP and EBGP roles. Lastly, the section reviews how to configure, monitor, and troubleshoot OSPF and BGP using routing policies and various tools.
Topic 5	Data Center Architectures: This section of the exam measures the skills of a Data Center Architect and covers foundational knowledge about various data center designs. It includes traditional multitier architectures as well as more modern IP fabric architectures using spine-leaf topologies. The section also touches on Layer 2 and Layer 3 strategies for forwarding traffic, the differences between overlay and underlay networks, and introduces Ethernet VPN–Virtual Extensible LAN (EVPN-VXLAN), explaining its basic purpose and role in data center environments.

NO.44 In the context of Link Aggregation Groups (LAG), what is the primary purpose of LACP?

To provide a method for encrypting data packets

To dynamically manage the bundling of several physical ports

To reduce the speed of data transfer

To increase the error rate in data transmission

NO.45 What is a key characteristic of traditional multi-tier data center architectures?

They primarily use a flat network design.

They consist of a modular, scalable design.

They are organized in a hierarchical model with distinct layers.

They exclusively use Layer 3 routing.

NO.46 What are two requirements for an IP fabric? (Choose two.)

a Layer 3 routing protocol

a single connection between each spine and leaf

a single connection between each leaf

a Layer 2 switching protocol

NO.47 In the Junos OS, which feature is used to create an alternate next hop with a unique preference for a static route?

Preference

Resolve

Next-hop

Qualified-next-hop

NO.48 Which state in the adjacency process do OSPF routers check the MTU size?

Init

Exchange

Done

ExStart

NO.49 Which two statements about IBGP are correct? (Choose two.)

By default, IBGP has a TTL of 1.

IBGP uses AS path for loop prevention.

By default, IBGP has a TTL of 255.

IBGP uses full mesh for loop prevention.

NO.50 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.

NO.51 A routing policy has been created to advertise OSPF routes in BGP. Which statement is correct in this scenario?

Apply the policy as an export policy within BGP.

Apply the policy as an export policy within OSPF.

Apply the policy as an import policy within BGP.

Apply the policy as an import policy within OSPF.

NO.52 In the context of protocol-independent routing, what is the main difference between static and generated routes?

Static routes require manual configuration, while generated routes are created dynamically.

Static routes are used for load balancing, while generated routes are not.

Generated routes support summarization, while static routes do not.

Generated routes are manually configured, while static routes are automatically created.

NO.53 Which statement is correct about the BGP AS path when advertising routes?

The order of the AS path is not significant.

The local AS number is added to the end of the AS path.

The order of the AS path is only significant in IBGP.

The local AS number is added to the beginning of the AS path.

NO.54 Which of the following BGP attributes is considered first in the route selection process?

Local Preference

AS Path Length

Origin

MED

NO.55 You are configuring OSPF in your network as shown in the exhibit. R1 has been configured with interface metrics. All other links in the network are using the default interface metric.
In this scenario, which OSPF interface on R1 will be preferred when routing traffic between R1 and R5?

ge-0/0/0

ge-0/0/3

ge-0/0/1

ge-0/0/2

NO.56 Referring to the exhibit, which statement is correct?

The ge-0/0/0 interface has been explicitly assigned to a VLAN named default.

The default VLAN is a user defined VLAN name.

The asterisk indicates that the interface is active.

The ge-0/0/12 interfaces is an access port.

NO.57 What is a common issue to check for when troubleshooting a LAG not forming correctly?

Mismatched VLAN configurations

Excessive broadcast traffic

Identical IP addresses on all LAG interfaces

Overutilization of CPU resources

NO.58 In OSPF, what is the function of the Link-State Database (LSDB)?

To store OSPF routing tables.

To maintain a list of OSPF neighbors.

To keep the topology structure of the network.

To log changes in network topology.

NO.59 In configuring load balancing on a network router, which aspect is most crucial?

The encryption protocol used

The number of routing tables

The selection of multiple equal-cost paths

The use of aggregate routes

NO.60 Which statement is correct about aggregate routes?

The default next hop is discard.

The default next hop is readvertise.

The default next hop is resolve.

The default next hop is reject.

NO.61 When evaluating BGP routes, what will be evaluated first?

The local preference value

The AS path

The MED value

The origin value

NO.62 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.

NO.63 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.

NO.64 In OSPF, which term refers to routers that have interfaces in multiple areas?

Internal Routers

Backbone Routers

Area Border Routers (ABRs)

Autonomous System Boundary Routers (ASBRs)

NO.65 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?