JN0-281 NEW CRAM MATERIALS, JN0-281 EXAM PREPARATION

JN0-281 New Cram Materials, JN0-281 Exam Preparation

JN0-281 New Cram Materials, JN0-281 Exam Preparation

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Tags: JN0-281 New Cram Materials, JN0-281 Exam Preparation, JN0-281 Test Guide, Trustworthy JN0-281 Source, JN0-281 Valid Exam Topics

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Juniper JN0-281 Exam Syllabus Topics:

TopicDetails
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
  • 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 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
  • 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
  • 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.

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JN0-281 Exam Preparation, JN0-281 Test Guide

This format enables you to assess your JN0-281 test preparation with a Juniper JN0-281 certification exam. You can also customize your time and the kinds of Juniper JN0-281 Exam Questions of the Juniper JN0-281 practice test. BraindumpsPrep has formulated JN0-281 PDF questions for the convenience of Juniper JN0-281 test takers.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q89-Q94):

NEW QUESTION # 89
Which signaling protocol is used for EVPN?

  • A. PIM
  • B. BGP
  • C. OSPF
  • D. IS-IS

Answer: B

Explanation:
EVPN (Ethernet Virtual Private Network) is a standard protocol used for building Layer 2 and Layer 3 VPNs over an IP or MPLS network. The signaling protocol used for EVPN is BGP (Border Gateway Protocol).
Step-by-Step Breakdown:
BGP as the EVPN Signaling Protocol:
EVPN uses BGP to exchange MAC address reachability information between routers (PE devices). This enables devices to learn which MAC addresses are reachable through which PE devices, facilitating Layer 2 forwarding across an IP or MPLS core.
BGP Extensions for EVPN:
BGP is extended with new address families (e.g., EVPN NLRI) to carry both MAC and IP address information, allowing for scalable and efficient multi-tenant network solutions. Juniper Reference: Junos EVPN Configuration: Juniper uses BGP as the control plane for EVPN to exchange MAC and IP route information between different data center devices.


NEW QUESTION # 90
What is an advantage of using BFD?

  • A. BFD is built to handle the routing table of the entire Internet, unlike IGPS.
  • B. BFD is so lightweight that each protocol will generate its own unique BFD session by default, to replace its own hello messages.
  • C. One BFD monitoring session can be used by multiple protocols.
  • D. BFD built to handle the routing table of the entire Internet, and can safely redistribute it into OSPF.

Answer: C


NEW QUESTION # 91
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 # 92
Which two statements describe an IP fabric? (Choose two.)

  • A. An IP fabric provides traffic load sharing.
  • B. An IP fabric uses spine and leaf devices.
  • C. An IP fabric allows devices to always be one hop away.
  • D. An IP fabric depends on Layer 2 switching.

Answer: A,B

Explanation:
An IP fabric is a network topology designed to provide a scalable, low-latency architecture that is typically implemented in modern data centers. It uses spine and leaf switches and enables efficient traffic load sharing across the network.
Step-by-Step Breakdown:
Spine-Leaf Architecture:
Leaf Devices: These switches connect to servers and edge devices within the data center. Each leaf switch connects to every spine switch.
Spine Devices: These high-performance switches interconnect all the leaf switches. There are no direct connections between leaf switches or spine switches. This architecture ensures that any two endpoints within the fabric are only one hop away from each other, minimizing latency.
Traffic Load Sharing:
An IP fabric leverages Equal-Cost Multipath (ECMP) to distribute traffic evenly across all available paths between leaf and spine switches, providing effective load balancing. This ensures that no single link becomes a bottleneck and that traffic is distributed efficiently across the network.
Juniper Reference:
Juniper provides QFX Series switches optimized for IP fabric topologies, allowing for scalable deployments in modern data centers.
EVPN-VXLAN: Often used in IP fabrics to extend Layer 2 services across the fabric with Layer 3 underlay, enabling both efficient routing and bridging.


NEW QUESTION # 93
What is the default route preference of a static route in the Junos OS?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: A

Explanation:
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 # 94
......

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