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Juniper JN0-281 Exam Syllabus Topics:

Topic	Details
Topic 1	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 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	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 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 (Q184-Q189):

NEW QUESTION # 184
Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

A. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.
B. When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.
C. When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.
D. When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Answer: C,D

Explanation:
The exhibit shows a BGP peering scenario between three routers: router1 and router2 are part of the same AS (AS65000), while the SP router is in a different AS (AS65101). This indicates an EBGP (External BGP) peering between the SP router and router1, and IBGP between router1 and router2.
Step-by-Step Breakdown:
Next-Hop Behavior in BGP:
IBGP: In IBGP, the next-hop address is not modified when advertising routes within the same AS. Thus, when router1 advertises routes learned from router2 to the SP router, it will keep the next-hop address of router1, not router2.
EBGP: In EBGP, the next-hop address is modified. When router1 receives routes from the SP router, it will advertise them to router2 with the next-hop address of router1.
Route Propagation:
Routes received by router1 from router2 will be advertised to the SP router with router1 as the next hop.
Similarly, routes advertised by the SP router will be passed on to router2, with router1 remaining as the next hop.
Juniper
Reference: BGP Next-Hop: Juniper's BGP implementations follow standard BGP next-hop behavior, where the next-hop is modified in EBGP but not in IBGP, ensuring proper route advertisement across autonomous systems.

NEW QUESTION # 185
In a traditional multi-tier architecture, which layer is responsible for aggregating access layers and providing connectivity to the core layer?

A. Core Layer
B. Edge Layer
C. Distribution Layer
D. Access Layer

Answer: C

NEW QUESTION # 186
Which of the following are features of storm control on Junos switches? (Choose two)

A. It can be configured to shut down a port during a storm.
B. It encrypts broadcast and multicast traffic.
C. It automatically reroutes traffic during a storm.
D. It supports thresholds for broadcast, multicast, and unknown unicast traffic.

Answer: A,D

NEW QUESTION # 187
Which two statements about IBGP are correct? (Choose two.)

A. By default, IBGP has a TTL of 1.
B. By default, IBGP has a TTL of 255.
C. IBGP uses full mesh for loop prevention.
D. IBGP uses AS path for loop prevention.

Answer: B,C

Explanation:
IBGP (Internal Border Gateway Protocol) is used to exchange routing information between routers within the same AS (Autonomous System).
Step-by-Step Breakdown:
TTL of 255:
By default, IBGP sessions are established with a TTL (Time to Live) value of 255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional configuration.
Full Mesh Requirement:
IBGP requires a logical full mesh between all IBGP routers to ensure that routing information is fully distributed within the AS. Since IBGP does not propagate routes learned from one IBGP peer to another by default, a full mesh topology is needed unless route reflectors or BGP confederations are used.
Juniper Reference:
IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full-mesh requirements.

NEW QUESTION # 188
What is the definition of a trunk interface on a switch?

A. An interface that carries excess traffic.
B. An interface that carries multiple VLANs.
C. An interface that carries high bandwidth.
D. An interface that connects directly to powerful servers.

Answer: B

Explanation:
A trunk interface on a switch is used to carry traffic for multiple VLANs between switches or between a switch and another network device, like a router. Trunk interfaces use 802.1Q tagging to identify which VLAN the traffic belongs to.
Step-by-Step Breakdown:
Trunk Ports:
Trunk ports are typically used for inter-switch links or switch-to-router links where multiple VLANs need to be carried over the same physical connection.
VLAN traffic is tagged with a VLAN ID to ensure that it is properly identified as it crosses the trunk link.
802.1Q VLAN Tagging:
Trunk ports use 802.1Q to tag Ethernet frames with the VLAN ID. This ensures that frames are correctly forwarded to the appropriate VLANs on the other side of the trunk.
Juniper Reference:
Trunk Interface Configuration: In Juniper switches, trunk ports are configured to carry tagged traffic for multiple VLANs, which is essential for interconnecting multiple network segments.

NEW QUESTION # 189
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Reliable JN0-281 Exam Camp - JN0-281 Reliable Test Camp

Juniper JN0-281 Exam Syllabus Topics:

JN0-281 Reliable Test Camp - Premium JN0-281 Files

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q184-Q189):

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