JN0-281 Reliable Test Tips - JN0-281 Popular Exams

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q126-Q131):

NEW QUESTION # 126
Which statement is correct about the BGP AS path when advertising routes?

A. The order of the AS path is only significant in IBGP.
B. The local AS number is added to the end of the AS path.
C. The local AS number is added to the beginning of the AS path.
D. The order of the AS path is not significant.

Answer: C

Explanation:
The BGP AS (Autonomous System) path attribute is crucial in path selection and loop prevention.
Each BGP router appends its local AS number to the beginning of the AS path when it advertises a route to an external BGP (eBGP) peer.
Step-by-Step Breakdown:
AS Path Attribute:
The AS path is a sequence of AS numbers that a route has traversed to reach a destination. Each AS adds its number to the front of the path, allowing BGP to track the route's history.
Why the Local AS is Added at the Beginning:
When advertising a route to an eBGP neighbor, a BGP router adds its own AS number to the beginning of the AS path. This ensures that the AS path reflects the route's journey accurately from the origin to the destination, and prevents loops in BGP. If the route returns to the same AS, the router will detect its AS number in the path and reject the route, preventing routing loops. Order of the AS Path:
The order is significant because BGP uses it to select the best path. A shorter AS path is preferred, as it indicates fewer hops between the source and destination. Juniper Reference: AS Path Attribute: Junos devices append the local AS at the start of the AS path before advertising the route to an external peer.

NEW QUESTION # 127
In the context of protocol-independent routing, what is the main difference between static and generated routes?

A. Generated routes are manually configured, while static routes are automatically created.
B. Static routes are used for load balancing, while generated routes are not.
C. Generated routes support summarization, while static routes do not.
D. Static routes require manual configuration, while generated routes are created dynamically.

Answer: D

NEW QUESTION # 128
Which signaling protocol is used for EVPN?

A. PIM
B. OSPF
C. IS-IS
D. BGP

Answer: D

Explanation:
EVPN (Ethernet Virtual Private Network) is a standard protocol used for building Layer 2 and Layer 3 VPNs over an IP or MPLS network. The signaling protocol used for EVPN is BGP (Border Gateway Protocol).
Step-by-Step Breakdown:
BGP as the EVPN Signaling Protocol:
EVPN uses BGP to exchange MAC address reachability information between routers (PE devices). This enables devices to learn which MAC addresses are reachable through which PE devices, facilitating Layer 2 forwarding across an IP or MPLS core.
BGP Extensions for EVPN:
BGP is extended with new address families (e.g., EVPN NLRI) to carry both MAC and IP address information, allowing for scalable and efficient multi-tenant network solutions. Juniper Reference: Junos EVPN Configuration: Juniper uses BGP as the control plane for EVPN to exchange MAC and IP route information between different data center devices.

NEW QUESTION # 129
What is the main purpose of Bidirectional Forwarding Detection (BFD)?

A. to determine packet round-trip latency
B. to determine if the forwarding routes are correct
C. to detect the forwarding protocol
D. to detect network path failures

Answer: D

Explanation:
Bidirectional Forwarding Detection (BFD) is a network protocol used to detect failures in the network path between two devices quickly.
Step-by-Step Breakdown:
Path Failure Detection:
BFD provides a low-overhead mechanism for detecting failures in forwarding paths across Layer 3 networks. It is much faster than traditional routing protocol timers and can detect failures within milliseconds.
BFD in Routing:
BFD can be integrated with routing protocols like OSPF, BGP, or IS-IS to trigger a faster convergence when a network path goes down.
Juniper
Reference: BFD Configuration: Juniper devices use BFD to monitor network paths and ensure fast failure detection, enhancing network resilience.

NEW QUESTION # 130
Which two statements describe an IP fabric? (Choose two.)

A. An IP fabric allows devices to always be one hop away.
B. An IP fabric uses spine and leaf devices.
C. An IP fabric provides traffic load sharing.
D. An IP fabric depends on Layer 2 switching.

Answer: B,C

Explanation:
An IP fabric is a network topology designed to provide a scalable, low-latency architecture that is typically implemented in modern data centers. It uses spine and leaf switches and enables efficient traffic load sharing across the network.
Step-by-Step Breakdown:
Spine-Leaf Architecture:
Leaf Devices: These switches connect to servers and edge devices within the data center. Each leaf switch connects to every spine switch.
Spine Devices: These high-performance switches interconnect all the leaf switches. There are no direct connections between leaf switches or spine switches. This architecture ensures that any two endpoints within the fabric are only one hop away from each other, minimizing latency.
Traffic Load Sharing:
An IP fabric leverages Equal-Cost Multipath (ECMP) to distribute traffic evenly across all available paths between leaf and spine switches, providing effective load balancing. This ensures that no single link becomes a bottleneck and that traffic is distributed efficiently across the network. Juniper Reference: Juniper provides QFX Series switches optimized for IP fabric topologies, allowing for scalable deployments in modern data centers.
EVPN-VXLAN: Often used in IP fabrics to extend Layer 2 services across the fabric with Layer 3 underlay, enabling both efficient routing and bridging.

NEW QUESTION # 131
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JN0-281 Reliable Test Tips - JN0-281 Popular Exams

JN0-281 Popular Exams | Certification JN0-281 Test Questions

Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q126-Q131):

High Pass-Rate JN0-281 Reliable Test Tips, Ensure to pass the JN0-281 Exam

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