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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q131-Q136):

NEW QUESTION # 131
What are two reasons why you would deploy an IP fabric instead of a traditional Layer 2 network in a data center? (Choose two.)

A. Layer 3 networks support load balancing.
B. IP fabrics are better suited to smaller networks where scale is less important.
C. Layer 2 networks only support a single broadcast domain.
D. Layer 2 networks are susceptible to loops.

Answer: A,D

Explanation:
IP fabrics are Layer 3-centric network designs often used in data centers due to their scalability, efficient routing, and loop-free architecture.
Step-by-Step Breakdown:
Layer 3 Load Balancing:
IP fabrics use Equal-Cost Multipath (ECMP) to distribute traffic across multiple paths, providing effective load balancing and improving bandwidth utilization. This capability is absent in traditional Layer 2 networks, which do not support ECMP for routing decisions.
Layer 2 Loops:
Layer 2 networks are prone to loops because of the lack of TTL (Time-to-Live) mechanisms. Spanning Tree Protocol (STP) is required to prevent loops, but it can introduce inefficiencies by blocking links. In contrast, IP fabrics based on Layer 3 protocols are loop-free and do not need STP. Juniper Reference: IP Fabric: Juniper's IP fabric solutions offer efficient Layer 3 routing with built-in load balancing and loop prevention, making them ideal for modern data center architectures.

NEW QUESTION # 132
Which LSA types are associated with OSPF? (Choose three)

A. External LSA (Type 5)
B. Router LSA (Type 1)
C. Summary LSA (Type 3)
D. Network LSA (Type 2)

Answer: B,C,D

NEW QUESTION # 133
What is the primary use of a virtual link in OSPF?

A. To connect OSPF areas to external networks.
B. To encrypt OSPF traffic.
C. To balance load across multiple links.
D. To connect an OSPF area to the backbone area through a non-backbone area.

Answer: D

NEW QUESTION # 134
You are creating an IP fabric underlay and want to use OSPF as your routing protocol.
In this scenario, which statement is correct?

A. Interface speeds should be the same throughout the fabric to ensure that all links are utilized.
B. All leaf devices must be configured in separate OSPF areas.
C. All spine devices must use the same router I
D. All leaf and spine devices must be the same model to ensure the proper load-balancing behavior.

Answer: A

Explanation:
When creating an IP fabric underlay using OSPF as the routing protocol, consistent interface speeds are important to ensure optimal traffic distribution and utilization of all links. Step-by-Step Breakdown:
OSPF and Interface Speeds:
OSPF calculates the cost of a link based on its bandwidth.
The default cost calculation in OSPF is:
If interface speeds vary significantly, OSPF may choose paths with lower cost (higher bandwidth), resulting in some links being underutilized.
Equal Utilization:
To ensure that all links are equally utilized in an IP fabric, it is recommended to maintain uniform interface speeds across the fabric. This ensures balanced load sharing across all available paths. Juniper Reference: IP Fabric with OSPF: Juniper recommends consistent interface speeds to maintain even traffic distribution and optimal link utilization in IP fabric underlay designs.

NEW QUESTION # 135
What is the primary purpose of an IRB Layer 3 interface?

A. to provide port security
B. to provide load balancing
C. to provide a default VLAN ID
D. to provide inter-VLAN routing

Answer: D

Explanation:
The primary purpose of an IRB (Integrated Routing and Bridging) interface is to enable inter-VLAN routing in a Layer 3 environment. An IRB interface in Junos combines the functionality of both Layer 2 bridging (switching) and Layer 3 routing, allowing devices in different VLANs to communicate with each other.
Step-by-Step Breakdown:
VLANs and Layer 2 Switching:
Devices within the same VLAN can communicate directly through Layer 2 switching. However, communication between devices in different VLANs requires Layer 3 routing.
IRB Interface for Inter-VLAN Routing:
The IRB interface provides a Layer 3 gateway for each VLAN, enabling routing between VLANs. Without an IRB interface, devices in different VLANs would not be able to communicate.
Configuration:
In Juniper devices, the IRB interface is configured by assigning Layer 3 IP addresses to it. These IP addresses serve as the default gateway for devices in different VLANs. Example configuration:
set interfaces irb unit 0 family inet address 192.168.1.1/24 set vlans vlan-10 l3-interface irb.0 This allows VLAN 10 to use the IRB interface for routing.
Juniper
Reference: IRB Use Case: Inter-VLAN routing is essential in data centers where multiple VLANs are deployed, and Juniper's EX and QFX series switches support IRB configurations for this purpose.

NEW QUESTION # 136
......

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