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Juniper JN0-281 Exam Syllabus Topics:

Topic
Details

Topic 1

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 2

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 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

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

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.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q99-Q104):

NEW QUESTION # 99
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.
B. It will flood it out of all interfaces, except for the directly connected VLAN.
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 next-hop interface.

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 # 100
What is the primary purpose of OSPF in network routing?

A. To encrypt data traffic between different networks.
B. To offer dynamic routing within an autonomous system using link-state information.
C. To redistribute routes between autonomous systems.
D. To provide path vector routing within an autonomous system.

Answer: B

NEW QUESTION # 101
What is the primary function of a VLAN?

A. To encrypt network traffic.
B. To control network traffic based on MAC addresses.
C. To provide a routing mechanism between different networks.
D. To segment a network into multiple broadcast domains.

Answer: D

NEW QUESTION # 102
When configuring High Availability components, which of the following practices are recommended? (Choose two)

A. Ensure physical redundancy of critical components.
B. Implement regular testing of failover mechanisms.
C. Regularly update firmware to non-recommended versions.
D. Use a single path for data and control traffic.

Answer: A,B

NEW QUESTION # 103
In Ethernet switching, what is the primary function of a storm control policy?

A. To filter MAC addresses.
B. To restrict the rate of certain types of traffic.
C. To prevent loops in the network.
D. To segregate broadcast domains.

Answer: B

NEW QUESTION # 104
......

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