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Valid Juniper JN0-281 Exam Camp & Test JN0-281 Dumps.zip

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Valid Juniper JN0-281 Exam Camp & Test JN0-281 Dumps.zip

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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
  • 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
  • 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
  • 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.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q173-Q178):NEW QUESTION # 173
Referring to the exhibit, why are the BGP routes hidden?

  • A. The BGP next hop is unreachable.
  • B. Load balancing is not enabled.
  • C. Other routes are selected because of better metrics.
  • D. There are too many hops to the destination.
Answer: A
Explanation:
In the exhibit, the BGP routes are marked as hidden. This typically happens when the routes are not considered valid for use, but they remain in the routing table for reference. One common reason for BGP routes being hidden is that the next hop for these routes is unreachable.
Step-by-Step Breakdown:
BGP Next Hop:
In BGP, when a route is received from a neighbor, the next hop is the IP address that must be reachable for the route to be used. If the next hop is unreachable (i.e., the router cannot find a path to the next-hop IP), the route is marked as hidden. Analyzing the Exhibit:
The exhibit shows that the BGP next hop for all hidden routes is 10.4.4.4. If this IP is unreachable, the BGP routes from that neighbor will not be considered valid, even though they appear in the routing table.
Verification:
Use the command show route 10.4.4.4 to check if the next-hop IP is reachable.
If the next-hop is not reachable, the BGP routes will be hidden. Resolving the next-hop reachability issue (e.g., fixing an IGP route or an interface) will allow the BGP routes to become active. Juniper Reference: Junos Command: show route hidden displays routes that are not considered for forwarding. Troubleshooting: Check the next hop reachability for hidden BGP routes using show route <next-hop>.

NEW QUESTION # 174
What does filter-based forwarding in networking typically allow?
  • A. Forwarding decisions based on MAC addresses
  • B. Routing decisions based on extended criteria like packet headers
  • C. Aggregation of multiple routes into a single entry
  • D. Load balancing across multiple CPUs
Answer: B

NEW QUESTION # 175
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 a MAC address learned on the interface to be persistently retained in the Ethernet-switching table, even after a reboot.
  • C. This configuration enables the interface to learn and remember MAC addresses, until the device is rebooted.
  • D. This configuration enables the device to shut down the interface when a particular MAC address persistently sends broadcast traffic.
Answer: B
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 # 176
Which operation mode command will display the mapping between the VLAN ID and ports on a switch?
  • A. show interfaces terse
  • B. show vlans
  • C. show ethernet-switching table
  • D. show route
Answer: B
Explanation:
To display the mapping between VLAN IDs and ports on a Juniper switch, the show vlans command is used.
Step-by-Step Breakdown:
VLAN Information:
The show vlans command displays detailed information about VLAN configurations, including the VLAN ID, associated interfaces (ports), and VLAN membership.
Command Example:
show vlans
This command will provide an output listing each VLAN, its ID, and the interfaces associated with the VLAN, enabling network engineers to quickly verify VLAN to port mappings.
Juniper Reference:
VLAN Verification: Use the show vlans command to verify which VLANs are configured on the switch and the ports that are members of those VLANs.

NEW QUESTION # 177
Which two statements are correct about EVPN-VXLAN overlay networking? (Choose two.)
  • A. OSPF provides the control plane within the overlay network.
  • B. BGP provides the control plane within the overlay network.
  • C. An encapsulation of the original packet is required to transport the packet across the network.
  • D. It is the only option to provide reachability between servers that reside in the same network segment in a data center.
Answer: B,C
Explanation:
EVPN-VXLAN is an overlay technology used in data center networks to extend Layer 2 services over a Layer 3 network.
Step-by-Step Breakdown:
BGP Control Plane:
BGP (Border Gateway Protocol) is used as the control plane for EVPN-VXLAN. BGP advertises MAC addresses and IP address reachability information across the VXLAN network, enabling efficient multi-tenant Layer 2 connectivity over a Layer 3 infrastructure.
Encapsulation:
VXLAN (Virtual Extensible LAN) encapsulates Layer 2 frames into Layer 3 packets. This encapsulation allows Layer 2 traffic to be transported across a Layer 3 network, effectively creating a tunnel for Ethernet frames.
Juniper Reference:
EVPN-VXLAN Configuration: Juniper supports EVPN-VXLAN with BGP as the control plane, allowing scalable Layer 2 connectivity over a routed infrastructure in modern data centers.

NEW QUESTION # 178
......
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