[Nov 19, 2025] JN0-281 Exam Dumps - Try Best JN0-281 Exam Questions - ExamDumpsVCE [Q109-Q124]

[Nov 19, 2025] JN0-281 Exam Dumps - Try Best JN0-281 Exam Questions - ExamDumpsVCE

Verified JN0-281 exam dumps Q&As with Correct 197 Questions and Answers

Juniper JN0-281 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	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 3	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.
Topic 4	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 5	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.

 

NEW QUESTION # 109
Which BGP message type is used to establish peering sessions?

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

Answer: A

NEW QUESTION # 110
What statement is true about load-balancing?

• A. Load balancing on Juniper devices is processed per-packet.
• B. Load balancing on Juniper devices is processed per-flow.
• C. Load balancing is only supported by dynamic routing protocols.
• D. Load balancing is only supported after applying an advanced license.

Answer: B

NEW QUESTION # 111
When using spine and leaf fabric architectures, what is the role of each device? (Choose two.)

• A. Spine nodes are used for host connectivity.
• B. Spine nodes are used for transit to other leaf nodes.
• C. Leaf nodes are used for host connectivity.
• D. Leaf nodes are used for traffic to other leafs.

Answer: B,C

Explanation:
In a spine-leaf fabric architecture, which is commonly used in data center designs, each device has a distinct role to ensure efficient and scalable network traffic flow. Step-by-Step Breakdown:
Spine Nodes:
The spine nodes form the backbone of the fabric and are responsible for transit traffic between leaf nodes. They connect to every leaf switch and provide multiple paths for traffic between leaf nodes, ensuring redundancy and load balancing.
Leaf Nodes:
The leaf nodes are used for host connectivity. These switches connect to servers, storage, or edge routers. They also connect to the spine switches to reach other leaf switches. Juniper Reference: Spine-Leaf Architecture: In Juniper's IP fabric designs, spine switches handle inter-leaf communication, while leaf switches manage host and endpoint connectivity.

NEW QUESTION # 112
In Junos, which command is used to display the status of all interfaces?

• A. show interfaces descriptions
• B. show vlan brief
• C. show ethernet-switching table
• D. show interfaces terse

Answer: D

NEW QUESTION # 113
EVPN/VXLAN is primarily used in modern data centers to:

• A. Enhance the physical security of the data center.
• B. Increase the physical distance between data centers.
• C. Replace traditional routing protocols.
• D. Provide Layer 2 connectivity over a Layer 3 network.

Answer: D

NEW QUESTION # 114
Which static routing parameter will silently drop the packet if it is set as the next hop?

• A. Readvertise
• B. Reject
• C. Discard
• D. Resolve

Answer: C

Explanation:
When the discard option is configured as the next hop for a static route, it silently drops any packets that match the route without sending any notification to the sender.
Step-by-Step Breakdown:
Discard Behavior:
If a route uses the discard next hop, the router drops the packet without generating any ICMP message or error back to the sender. This is useful for creating null routes to prevent routing loops or blackhole traffic intentionally.
Reject vs. Discard:
The reject next hop, in contrast, drops the packet but sends an ICMP Destination Unreachable message back to the source.
Juniper
Reference: Static Route Behavior: In Junos, the discard option ensures packets matching a static route are dropped silently, providing a way to discard traffic without alerting the source.

NEW QUESTION # 115
Referring to the exhibit, which statement is correct?

• A. The ge-0/0/12 interfaces is an access port.
• B. The asterisk indicates that the interface is active.
• C. The ge-0/0/0 interface has been explicitly assigned to a VLAN named default.
• D. The default VLAN is a user defined VLAN name.

Answer: B

NEW QUESTION # 116
Which statement is correct about per-flow load balancing?

• A. The packets are guaranteed to arrive at their destination in the same order in which they were sent.
• B. Packets associated with the same flow are sent through the same egress port.
• C. Packets associated with the same flow are sent through different egress ports.
• D. The packets are guaranteed to arrive at their destination in a different order in which they were sent.

Answer: B

Explanation:
Per-flow load balancing ensures that packets within the same flow are always forwarded over the same path, ensuring that packet order is preserved.
Step-by-Step Breakdown:
Flow Definition:
A flow is typically defined by a combination of packet attributes like source/destination IP, source/destination port, and protocol type. Packets that belong to the same flow are routed over the same path to avoid reordering.
Per-Flow Behavior:
In per-flow load balancing, the hashing algorithm ensures that all packets in a particular flow use the same egress port, maintaining order across the network.
Juniper Reference:
Load Balancing in Juniper: This method ensures that flows are balanced across multiple paths while preventing packet reordering within a single flow.

NEW QUESTION # 117
What is the primary difference between IBGP and EBGP?

• A. The way they advertise routes
• B. The requirement for a full mesh topology
• C. The administrative distance
• D. The use of AS_PATH attribute

Answer: C

NEW QUESTION # 118
Referring to the exhibit, which two statements are correct about the IP fabric? (Choose two.)

• A. Only traffic between pods must traverse the super spine devices.
• B. All traffic must traverse the super spine devices.
• C. This is a three-stage IP fabric.
• D. This is a five-stage fabric.

Answer: A,D

NEW QUESTION # 119
Which statement is correct about areas in OSPF?

• A. OSPF areas are used to reduce the size of the link-state database.
• B. An OSPF area is used to signify the autonomous system to which each device belongs.
• C. An OSPF area is used to segment Layer 2 broadcast domains.
• D. OSPF areas are used to isolate the effects of a broadcast storm.

Answer: A

Explanation:
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 # 120
How does VLAN tagging benefit network segmentation?

• A. By providing a backup path for data in case of link failure.
• B. By enabling the identification and separation of traffic belonging to different VLANs.
• C. By encrypting data traffic between VLANs.
• D. By ensuring the same IP address range can be used in different VLANs.

Answer: B

NEW QUESTION # 121
When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)

• A. The BFD default multiplier is 5.
• B. The BFD operation always consists of minimum intervals and multipliers.
• C. You can configure BFD per interface within the protocol stanza.
• D. The BFD default minimum interval is 3.

Answer: B,C

Explanation:
Bidirectional Forwarding Detection (BFD) is a protocol used to detect faults in the forwarding path between two routers. It provides rapid failure detection, enhancing the performance of routing protocols like OSPF, BGP, and IS-IS.
Step-by-Step Breakdown:
Per Interface Configuration:
BFD can be configured on a per-interface basis within the protocol stanza (e.g., OSPF, BGP). This allows granular control over where BFD is enabled and the failure detection intervals for specific interfaces.
Minimum Interval and Multiplier:
BFD uses a minimum interval (the time between BFD control packets) and a multiplier (the number of missed packets before the path is declared down). The combination of these two defines the detection time for failures.
Juniper
Reference: BFD Configuration: In Juniper, BFD is configurable within routing protocol stanzas, with the failure detection mechanism always based on minimum intervals and multipliers.

NEW QUESTION # 122
Exhibit:

Referring to the exhibit, which next hop will be preferred in the routing table?

• A. Next hop IP address 172.25.20.200 will be preferred.
• B. Both next hops will be preferred.
• C. Neither next hop will be preferred.
• D. Next hop IP address 172.25.20.254 will be preferred.

Answer: A

Explanation:
In the exhibit, we see a static route configuration with two possible next hops for the default route (0.0.0.0/0):
next-hop 172.25.20.254 with the default preference of 7.
qualified-next-hop 172.25.20.200 with a preference of 6.
Step-by-Step Breakdown:
Preference Value:
In Junos OS, the preference value is used to determine which route should be preferred in the routing table. The lower the preference value, the higher the priority for the route.
Comparison:
In this case:
The next hop 172.25.20.254 has a preference of 7.
The qualified-next-hop 172.25.20.200 has a preference of 6.
Preferred Next Hop:
Since 172.25.20.200 has a lower preference (6) compared to 172.25.20.254 (7), it will be the preferred next hop in the routing table, assuming both next hops are reachable. Juniper Reference: Qualified Next Hop: In Junos, static routes with multiple next-hop options are selected based on the preference value, with the lower value being preferred.

NEW QUESTION # 123
What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?

• A. They redistribute routes between OSPF and non-OSPF networks.
• B. They are responsible for generating LSAs for external routes.
• C. They reduce the number of adjacencies on broadcast networks.
• D. They determine the shortest path first algorithm.

Answer: C

NEW QUESTION # 124
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