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JN0-281 Hot Spot Questions, JN0-281 Real Exams

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Juniper JN0-281 Exam Syllabus Topics:

Topic
Details

Topic 1

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 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

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 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.

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q79-Q84):

NEW QUESTION # 79
Referring to the exhibit, which two statements are true? (Choose two.)

A. The BGP group is configured to attempt an EBGP peering session with 192.168.100.2.
B. The configuration will not pass the commit check.
C. The configuration will pass the commit check.
D. The BGP group is configured to attempt an EBGP peering session with 192.168.100.1.

Answer: A,B

NEW QUESTION # 80
Exhibit:

Referring to the exhibit, which statement is correct?

A. The configuration will commit successfully and BGP group 1 will operate as EBGP.
B. BGP group 1 requires a type internal parameter.
C. BGP group 1 requires a type external parameter.
D. The configuration will commit successfully and BGP group 1 will operate as IBGP.

Answer: A

Explanation:
In the exhibit, BGP is configured with local AS 65101 and a neighbor at 172.16.1.1 in peer AS 65201.
This setup involves two different Autonomous Systems (AS), indicating an External BGP (EBGP) configuration.
Step-by-Step Breakdown:
EBGP vs. IBGP:
EBGP is used between routers in different ASes. In this case, the local AS is 65101 and the peer AS is 65201, meaning the BGP session is EBGP.
IBGP is used between routers within the same AS, which is not applicable here as the AS numbers are different.
BGP Group Configuration:
The configuration does not require a type external parameter because Junos OS automatically recognizes the session as EBGP when the local and peer AS numbers are different. The BGP session will operate as EBGP, and the configuration will commit successfully.
Juniper
Reference: BGP Configuration: In Juniper, EBGP is automatically recognized when the local and peer AS numbers differ, without needing to specify type external.

NEW QUESTION # 81
Which OSPF router type connects an OSPF area to non-OSPF networks?

A. Internal Router
B. Autonomous System Boundary Router (ASBR)
C. Area Border Router (ABR)
D. Backbone Router

Answer: B

NEW QUESTION # 82
Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

A. EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.
B. EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.
C. EBGP routes are more preferred than IBGP routes.
D. IBGP routes are more preferred than EBGP routes.

Answer: A,C

Explanation:
EBGP (External BGP) and IBGP (Internal BGP) operate with different rules due to the nature of their relationships.
Step-by-Step Breakdown:
TTL Differences:
EBGP: By default, EBGP peers have a TTL of 1, meaning they must be directly connected, or the TTL needs to be manually increased for multihop EBGP.
IBGP: IBGP peers within the same AS have a TTL of 255, as they are expected to communicate over multiple hops within the AS.
Preference for EBGP Routes:
Routes learned via EBGP are typically preferred over IBGP routes. This is because EBGP routes are considered more reliable since they originate outside the AS, while IBGP routes are internal. Juniper Reference: BGP Configuration: The different handling of TTL and route preferences between EBGP and IBGP ensures proper route selection and security within Junos-based networks.

NEW QUESTION # 83
How does a layer 2 switch populate its bridge table?

A. It stores the destination MAC address of frames traversing the network.
B. It stores both the source and destination MAC addresses of frames traversing the network.
C. It stores the source MAC address of frames traversing the network.
D. It stores the protocol number of frames traversing the network.

Answer: C

NEW QUESTION # 84
......

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