JN0-281 EXAMCOLLECTION FREE DUMPS - JN0-281 SIMULATION QUESTIONS

JN0-281 Examcollection Free Dumps - JN0-281 Simulation Questions

JN0-281 Examcollection Free Dumps - JN0-281 Simulation Questions

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Juniper JN0-281 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 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
  • 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 4
  • 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 5
  • 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.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q24-Q29):

NEW QUESTION # 24
What is the primary difference between IBGP and EBGP?

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

Answer: B


NEW QUESTION # 25
MACsec provides protection against which two types of threats? (Choose two.)

  • A. Data decryption
  • B. Man-in-the-middle attack
  • C. Hashing attacks
  • D. Playback attacks

Answer: B,D

Explanation:
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 # 26
A switch receives a frame with a MAC address of FF-FF-FF-FF-FF-FF.
Which action will the switch take on this frame?

  • A. It will flood it out of all interfaces, except for the next-hop interface.
  • B. It will flood it out of all interfaces.
  • C. It will flood it out of all interfaces, except for the ingress interface.
  • D. It will flood it out of all interfaces, except for the directly connected VLAN.

Answer: C

Explanation:
A MAC address of FF-FF-FF-FF-FF-FF is the Ethernet broadcast address. When a switch receives a frame with this destination MAC address, it is required to forward the frame to all interfaces except the one it was received on.
Step-by-Step Breakdown: Broadcast Frame Handling:
When a frame with the broadcast MAC address is received, the switch will flood it out of all active ports that belong to the same VLAN as the incoming frame. The broadcast frame is not sent back out of the ingress interface (the interface where the frame was originally received).
Purpose of Flooding:
Broadcasting is used to ensure that the frame reaches all devices within the broadcast domain (all devices within the same VLAN), which may not have a specific entry for the MAC address in their MAC address table.
Juniper
Reference: Layer 2 Frame Forwarding: Juniper switches flood broadcast frames to all ports in the same VLAN, except the port the frame was received on.


NEW QUESTION # 27
What are two consequences of having all network devices in a single collision domain? (Choose two.)

  • A. The amount of network resource consumption is increased.
  • B. The amount of network resource consumption does not change.
  • C. The chance of packet collision is increased.
  • D. The chance of packet collision is decreased.

Answer: A,C

Explanation:
A collision domain is a network segment where data packets can "collide" with one another when being sent on the same network medium.
Step-by-Step Breakdown:
Increased Collision Probability:
If all devices are in a single collision domain, the likelihood of packet collisions increases as more devices attempt to send packets simultaneously, leading to network inefficiencies. Increased Resource Consumption:
More collisions result in increased network resource consumption as devices need to retransmit packets, causing higher utilization of bandwidth and slowing down network performance. Juniper Reference: Collision Domains: Proper network segmentation using switches reduces collision domains, thereby improving network performance and reducing packet collisions.


NEW QUESTION # 28
A generated route is configured under which hierarchy?

  • A. [edit routing-options]
  • B. [edit routing-instance]
  • C. [edit policy-options]
  • D. [edit protocols]

Answer: A

Explanation:
A generated route in 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.


NEW QUESTION # 29
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