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Helpful Features of Juniper JN0-281 PDF Questions

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JN0-281 Study Questions - Data Center, Associate (JNCIA-DC) Guide Torrent & JN0-281 Exam Torrent

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Juniper JN0-281 Exam Syllabus Topics:

Topic
Details

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

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 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

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.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q126-Q131):

NEW QUESTION # 126
How can OSPF be configured to prefer one route over another?

A. By setting a lower cost on the preferred route.
B. By adjusting interface bandwidth.
C. By setting a higher cost on the preferred route.
D. By configuring route redistribution.

Answer: A

NEW QUESTION # 127
Which two statements are true with regards to MACsec?

A. It does not provide authentication for an Ethernet traffic between two network nodes.
B. It provides authentication for an Ethernet traffic between two network nodes.
C. It does not provide encryption for an Ethernet traffic between two network nodes.
D. It provides encryption for an Ethernet traffic between two network nodes.

Answer: B,D

NEW QUESTION # 128
Which statement is correct about the BGP AS path when advertising routes?

A. The local AS number is added to the end of the AS path.
B. The order of the AS path is not significant.
C. The order of the AS path is only significant in IBGP.
D. The local AS number is added to the beginning of the AS path.

Answer: D

Explanation:
The BGP AS (Autonomous System) path attribute is crucial in path selection and loop prevention.
Each BGP router appends its local AS number to the beginning of the AS path when it advertises a route to an external BGP (eBGP) peer.
Step-by-Step Breakdown:
AS Path Attribute:
The AS path is a sequence of AS numbers that a route has traversed to reach a destination. Each AS adds its number to the front of the path, allowing BGP to track the route's history.
Why the Local AS is Added at the Beginning:
When advertising a route to an eBGP neighbor, a BGP router adds its own AS number to the beginning of the AS path. This ensures that the AS path reflects the route's journey accurately from the origin to the destination, and prevents loops in BGP. If the route returns to the same AS, the router will detect its AS number in the path and reject the route, preventing routing loops. Order of the AS Path:
The order is significant because BGP uses it to select the best path. A shorter AS path is preferred, as it indicates fewer hops between the source and destination. Juniper Reference: AS Path Attribute: Junos devices append the local AS at the start of the AS path before advertising the route to an external peer.

NEW QUESTION # 129
Which of the following statements are true regarding Graceful Restart (GR)? (Choose two)

A. It requires support from both the restarting router and its neighbors.
B. It decreases network stability during protocol restarts.
C. It is used to increase the convergence time of the network.
D. It helps in maintaining uninterrupted forwarding during a routing process restart.

Answer: A,D

NEW QUESTION # 130
Which two statements are correct about VLAN tags? (Choose two.)

A. VLAN tags can be inserted or removed by trunk interfaces.
B. VLAN tags require multiple forwarding tables.
C. VLAN tags carry a VLAN ID and priority.
D. VLAN tags are required on access ports.

Answer: A,C

Explanation:
VLAN tags are used in Ethernet frames to identify and differentiate traffic between multiple VLANs. They are especially important for devices like switches that handle multiple VLANs on the same physical link.
Step-by-Step Breakdown:
VLAN Tag Contents:
VLAN ID: The tag contains a 12-bit VLAN ID field that identifies the VLAN to which the frame belongs.
Priority: The tag also includes a 3-bit priority field (also known as 802.1p priority) used for QoS (Quality of Service) to prioritize traffic.
Trunk Ports and VLAN Tagging:
Trunk Ports are used to carry traffic for multiple VLANs across a single link. These interfaces insert (tag) VLAN identifiers into frames when they leave the switch and remove (untag) them when frames enter the switch.
Access Ports:
VLAN tags are typically not used on access ports (ports that connect to end devices) since those ports are configured to be part of a single VLAN, and the traffic doesn't need VLAN tags.
Juniper Reference:
VLAN Tagging: Juniper switches support VLAN tagging and ensure that frames are tagged or untagged as they traverse trunk or access ports, respectively.

NEW QUESTION # 131
......

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