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JN0-281 Certification Materials & JN0-281 Practice Exam

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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

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 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

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.

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JN0-281 Practice Exam, JN0-281 Valid Cram Materials

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q173-Q178):

NEW QUESTION # 173
Exhibit:

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

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

Answer: B,C

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 # 174
Which three technologies improve high availability and convergence in a data center network? (Choose three.)

A. Bidirectional Forwarding Detection (BFD)
B. link loss adjacency
C. Failover Group (FG)
D. link aggregation group (LAG)
E. graceful restart (GR)

Answer: A,D,E

Explanation:
High availability and fast convergence are critical in data center networks to minimize downtime and maintain optimal performance. The following technologies contribute to achieving these goals:
Graceful Restart (GR):
GR allows routers to maintain forwarding state during control plane restarts, ensuring continuous packet forwarding while minimizing network disruptions.
Bidirectional Forwarding Detection (BFD):
BFD provides fast detection of path failures, allowing routing protocols to converge quickly by detecting link failures much faster than traditional timers.
Link Aggregation Group (LAG):
LAG increases both redundancy and bandwidth by combining multiple physical links into one logical link, providing load balancing and fault tolerance.
Juniper Reference:
High Availability Techniques: These technologies are fundamental in ensuring rapid recovery and failover within Juniper-based data center environments.

NEW QUESTION # 175
What is a key characteristic of traditional multi-tier data center architectures?

A. They primarily use a flat network design.
B. They exclusively use Layer 3 routing.
C. They consist of a modular, scalable design.
D. They are organized in a hierarchical model with distinct layers.

Answer: D

NEW QUESTION # 176
What is the primary purpose of using static routes in a network?

A. To automatically adjust routes based on network traffic
B. To generate routing entries dynamically
C. To provide a manually configured routing entry
D. To aggregate multiple routes into one

Answer: C

NEW QUESTION # 177
What is the primary function of a VLAN?

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

Answer: A

NEW QUESTION # 178
......

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