[Apr 14, 2025] JN0-280 Ultimate Study Guide - TopExamCollection [Q43-Q58]

[Apr 14, 2025] JN0-280 Ultimate Study Guide – TopExamCollection [Q43-Q58]

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[Apr 14, 2025] JN0-280 Ultimate Study Guide – TopExamCollection

Ultimate Guide to Prepare JN0-280 Certification Exam for JNCIA-DC in 2025

Q43. 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.

Q44. What is the primary purpose of using static routes in a network?

To automatically adjust routes based on network traffic

To provide a manually configured routing entry

To aggregate multiple routes into one

To generate routing entries dynamically

Q45. When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)

You can configure BFD per interface within the protocol stanza.

The BFD default minimum interval is 3.

The BFD operation always consists of minimum intervals and multipliers.

The BFD default multiplier is 5.

Q46. Which of the following BGP attributes is considered first in the route selection process?

Local Preference

AS Path Length

Origin

MED

Q47. In OSPF, how is the Router ID determined?

By the highest IP address on any of the router’s active interfaces.

By the lowest MAC address of the router.

By a manually configured value in the router configuration.

By the highest loopback interface IP address.

Q48. Which BGP message type is used to establish peering sessions?

Update

Notification

Open

Keepalive

Q49. A generated route is configured under which hierarchy?

[edit policy-options]

[edit routing-instance]

[edit routing-options]

[edit protocols]

Agenerated routein Junos OS is configured under the[edit routing-options]hierarchy.
Step-by-Step Breakdown:
* Generated Routes:A generated route is created based on the presence of more specific routes in the routing table. It acts as a summary route and is generated when any of its contributing routes are active.
This is commonly used to create aggregate routes in OSPF, BGP, or other protocols.
* Configuration Hierarchy:The configuration for generated routes is placed under[edit routing-options]
, where other static and routing policies are also defined.
* Command Example:
set routing-options generate route 10.10.0.0/16
Juniper Reference:
* Routing Options: Juniper routers use the routing-options hierarchy to configure generated routes and other static routing behaviors.

Q50. 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

Q51. What is an advantage of using BFD?

BFD is so lightweight that each protocol will generate its own unique BFD session by default, to replace its own hello messages.

BFD built to handle the routing table of the entire Internet, and can safely redistribute it into OSPF.

One BFD monitoring session can be used by multiple protocols.

BFD is built to handle the routing table of the entire Internet, unlike IGPS.

Q52. Which of the following VLAN port modes exist in Junos OS? (Choose two)

Tunnel

Access

Trunk

Aggregated

Q53. What is the primary function of a VLAN?

To encrypt network traffic.

To provide a routing mechanism between different networks.

To segment a network into multiple broadcast domains.

To control network traffic based on MAC addresses.

Q54. 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.

EVPN-VXLANis an overlay technology used in data center networks to extend Layer 2 services over a Layer
3 network.
Step-by-Step Breakdown:
* BGP Control Plane:BGP (Border Gateway Protocol)is used as the control plane for EVPN-VXLAN.
BGP advertises MAC addresses and IP address reachability information across the VXLAN network, enabling efficient multi-tenant Layer 2 connectivity over a Layer 3 infrastructure.
* Encapsulation:VXLAN (Virtual Extensible LAN)encapsulates Layer 2 frames into Layer 3 packets.
This encapsulation allows Layer 2 traffic to be transported across a Layer 3 network, effectively creating a tunnel for Ethernet frames.
Juniper Reference:
* EVPN-VXLAN Configuration: Juniper supports EVPN-VXLAN with BGP as the control plane, allowing scalable Layer 2 connectivity over a routed infrastructure in modern data centers.

Q55. 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.

Q56. What is the behavior of the default export policy for OSPF?

Accept all routes.

Reject all routes.

Redistribute all routes.

Forward all routes.

In Junos, thedefault export policyforOSPFis toreject all routesfrom being exported.
Step-by-Step Breakdown:
* Default Export Policy:By default,OSPFin Junos does not export any routes to other routing protocols or neighbors. This is a safety mechanism to prevent unintended route advertisements.
* Custom Export Policies:
* If you need to export routes, you must create a customexport policythat explicitly defines which routes to advertise.
* Example: You can create an export policy to redistribute static or connected routes into OSPF.
Juniper Reference:
* OSPF Export Behavior: In Juniper devices, the default policy for OSPF is to reject route advertisements unless explicitly configured otherwise through custom policies.

Q57. You want to minimize topology disruptions in your network when the rpd process restarts on a device. Which service would accomplish this task?

Bidirectional Forwarding Detection (BFD)

link aggregation groups

graceful restart (GR)

Virtual Chassis

Graceful Restart (GR)is a feature that allows a router to maintain forwarding even when the routing process (e.g., the rpd process in Junos) is restarting, minimizing disruption to the network.
Step-by-Step Breakdown:
* Graceful Restart Function:During aGR event, the forwarding plane continues to forward packets based on existing routes, while the control plane (rpd process) is restarting. This prevents traffic loss and maintains routing stability.
* Minimizing Disruptions:GR is particularly useful in ensuring continuous packet forwarding during software upgrades or routing protocol process restarts.
Juniper Reference:
* Graceful Restart in Junos: GR ensures high availability by maintaining forwarding continuity during control plane restarts, enhancing network reliability.

Q58. You are creating an IP fabric underlay and want to use OSPF as your routing protocol.
In this scenario, which statement is correct?

All leaf devices must be configured in separate OSPF areas.

All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

Interface speeds should be the same throughout the fabric to ensure that all links are utilized.

All spine devices must use the same router ID.

When creating anIP fabric underlayusingOSPFas the routing protocol, consistentinterface speedsare important to ensure optimal traffic distribution and utilization of all links.
Step-by-Step Breakdown:
* OSPF and Interface Speeds:OSPF calculates the cost of a link based on its bandwidth. The default cost calculation in OSPF is:
A black text on a white background Description automatically generated

* If interface speeds vary significantly, OSPF may choose paths with lower cost (higher bandwidth), resulting in some links being underutilized.
* Equal Utilization:To ensure that all links are equally utilized in an IP fabric, it is recommended to maintain uniform interface speeds across the fabric. This ensures balanced load sharing across all available paths.
Juniper Reference:
* IP Fabric with OSPF: Juniper recommends consistent interface speeds to maintain even traffic distribution and optimal link utilization in IP fabric underlay designs.

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The JN0-280 exam consists of 65 multiple-choice questions that must be completed within 90 minutes. Candidates need to score at least 65% to pass the exam and become a Juniper Networks Certified Associate in Data Center (JNCIA-DC). JN0-280 exam covers a wide range of topics, including data center fundamentals, data center architecture, Ethernet switching, virtualization, and network security.

JNCIA-DC Fundamentals-JN0-280 Exam-Practice-Dumps: https://www.topexamcollection.com/JN0-280-vce-collection.html