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JN0-281 Reliable Exam Questions Will Be Your Reliable Support to Pass Data Center, Associate (JNCIA-DC)

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Juniper JN0-281 Exam Syllabus Topics:

Topic
Details

Topic 1

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 2

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 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

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

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.

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q174-Q179):

NEW QUESTION # 174
Which statement is correct about per-flow load balancing?

A. Packets associated with the same flow are sent through the same egress port.
B. Packets associated with the same flow are sent through different egress ports.
C. The packets are guaranteed to arrive at their destination in a different order in which they were sent.
D. The packets are guaranteed to arrive at their destination in the same order in which they were sent.

Answer: A

Explanation:
Per-flow load balancing ensures that packets within the same flow are always forwarded over the same path, ensuring that packet order is preserved.
Step-by-Step Breakdown:
Flow Definition:
A flow is typically defined by a combination of packet attributes like source/destination IP, source/destination port, and protocol type. Packets that belong to the same flow are routed over the same path to avoid reordering.
Per-Flow Behavior:
In per-flow load balancing, the hashing algorithm ensures that all packets in a particular flow use the same egress port, maintaining order across the network. Juniper Reference: Load Balancing in Juniper: This method ensures that flows are balanced across multiple paths while preventing packet reordering within a single flow.

NEW QUESTION # 175
You have configured a load balancing policy.
Which statement is correct about applying the policy?

A. The policy is applied as an export policy under the routing protocol's hierarchy.
B. The policy is applied as an import policy under routing-options forwarding table.
C. The policy is applied as an export policy under routing-options forwarding table.
D. The policy is applied as an import policy under the routing protocol's hierarchy.

Answer: C

NEW QUESTION # 176
Exhibit:

Referring to the exhibit, which behavior does this configuration enable on the ge-0/0/1.0 interface?

A. This configuration enables the device to place a MAC address that persistently causes network errors into a special protected VLAN.
B. This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic.
C. This configuration enables the interface to learn and remember MAC addresses, until the device is rebooted.
D. This configuration enables a MAC address learned on the interface to be persistently retained in the Ethernet-switching table, even after a reboot.

Answer: D

Explanation:
The configuration in the exhibit shows the persistent-learning feature enabled on interface ge-0/0/1.0.
Step-by-Step Breakdown:
Persistent Learning:
Persistent-learning ensures that the MAC addresses learned on the interface are retained in the Ethernet-switching table, even after a device reboot. This prevents the need to re-learn MAC addresses after the device restarts, improving stability and reducing downtime.
Use Case:
This feature is particularly useful in environments where the re-learning of MAC addresses could cause temporary disruptions or delays in communication, such as in critical Layer 2 network segments.
Command Example:
set switch-options interface ge-0/0/1.0 persistent-learning
Juniper Reference:
Persistent MAC Learning: In Junos, enabling persistent-learning ensures that learned MAC addresses are not lost during reboots, contributing to smoother network operations in environments where stability is crucial.

NEW QUESTION # 177
In the Junos OS, which feature is used to create an alternate next hop with a unique preference for a static route?

A. Preference
B. Resolve
C. Next-hop
D. Qualified-next-hop

Answer: D

Explanation:
In Junos OS, the qualified-next-hop feature is used to specify an alternate next hop for a static route, along with a unique preference value.
Step-by-Step Breakdown:
Qualified-Next-Hop:
A qualified-next-hop allows you to define multiple next hops for a static route, each with its own preference. This provides flexibility by allowing the router to choose the best available next hop based on reachability and preference.
Use Case:
If the primary next hop becomes unreachable, the router can automatically switch to the alternate next hop defined by the qualified-next-hop with a higher preference value.
Command Example:
set routing-options static route 10.10.10.0/24 qualified-next-hop 192.168.1.1 preference 5 set routing-options static route 10.10.10.0/24 qualified-next-hop 192.168.1.2 preference 10 Preference:
The next hop with the lowest preference is chosen first. If it becomes unavailable, the router will use the higher preference next hop.
Juniper
Reference: Qualified-Next-Hop: This feature is used to configure backup or alternate next hops for static routes in Juniper devices.

NEW QUESTION # 178
Which route is preferred by the Junos OS software routing tables?

A. Direct
B. Static
C. BGP
D. Aggregate

Answer: A

Explanation:
In Junos OS, direct routes are the most preferred routes in the routing table, having the highest priority.
Step-by-Step Breakdown:
Direct Routes:
Direct routes represent networks that are directly connected to the router's interfaces. Since these routes are directly accessible, they are assigned the highest priority and always take precedence over other types of routes.
Preference Values:
Direct routes have a preference of 0, which is the most preferred in Junos. Static routes, OSPF routes, and BGP routes have higher preference values and will only be used if there are no direct routes to the destination.
Juniper Reference:
Direct Route Preference: In Junos, direct routes are always preferred over other routes, ensuring that the router forwards traffic through locally connected networks.

NEW QUESTION # 179
......

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