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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q24-Q29):

NEW QUESTION # 24
What is the primary purpose of using static routes in a network?

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

Answer: A

NEW QUESTION # 25
Exhibit:

Referring to the exhibit, which statement is correct?

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

Answer: C

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 # 26
Leaf and spine data centers are used to better accommodate which type of traffic?

A. north-west
B. north-east
C. east-west
D. south-east

Answer: C

Explanation:
In modern data centers, the shift toward leaf-spine architectures is driven by the need to handle increased east-west traffic, which is traffic between servers within the same data center. Unlike traditional hierarchical data center designs, where most traffic was "north-south" (between users and servers), modern applications often involve server-to-server communication (east-west) to enable services like distributed databases, microservices, and virtualized workloads.
Leaf-Spine Architecture:
Leaf Layer: This layer consists of switches that connect directly to servers or end-host devices. These switches serve as the access layer.
Spine Layer: The spine layer comprises high-performance switches that provide interconnectivity between leaf switches. Each leaf switch connects to every spine switch, creating a non-blocking fabric that optimizes traffic flow within the data center.
East-West Traffic Accommodation:
In traditional three-tier architectures (core, aggregation, access), traffic had to traverse multiple layers, leading to bottlenecks when servers communicated with each other. Leaf-spine architectures address this by creating multiple equal-cost paths between leaf switches and the spine. Since each leaf switch connects directly to every spine switch, the architecture facilitates quick, low-latency communication between servers, which is essential for east-west traffic flows.
Juniper's Role:
Juniper Networks provides a range of solutions that optimize for east-west traffic in a leaf-spine architecture, notably through:
QFX Series Switches: Juniper's QFX series switches are designed for the leaf and spine architecture, delivering high throughput, low latency, and scalability to accommodate the traffic demands of modern data centers.
EVPN-VXLAN: Juniper uses EVPN-VXLAN to create a scalable Layer 2 and Layer 3 overlay network across the data center. This overlay helps enhance east-west traffic performance by enabling network segmentation and workload mobility across the entire fabric.
Key Features That Support East-West Traffic:
Equal-Cost Multipath (ECMP): ECMP enables the use of multiple paths between leaf and spine switches, balancing the traffic and preventing any one path from becoming a bottleneck. This is crucial in handling the high volume of east-west traffic.
Low Latency: Spine switches are typically high-performance devices that minimize the delay between leaf switches, which improves the efficiency of server-to-server communications.
Scalability: As the demand for east-west traffic grows, adding more leaf and spine switches is straightforward, maintaining consistent performance without redesigning the entire network.
In summary, the leaf-spine architecture is primarily designed to handle the increase in east-west traffic within data centers, and Juniper provides robust solutions to enable this architecture through its switch platforms and software solutions like EVPN-VXLAN.

NEW QUESTION # 27
In networking, what is a RIB group primarily used for?

A. To dynamically generate routing entries
B. To filter routes based on specific criteria
C. To balance the load across multiple links
D. To group multiple Routing Information Bases together for a common purpose

Answer: D

NEW QUESTION # 28
Which two protocols can you use for a data center underlay network? (Choose two)

A. EVPN
B. EBGP
C. OSPF
D. VXLAN

Answer: B,C

NEW QUESTION # 29
......

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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q24-Q29):

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