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Question 14 - JN0-280 discussion

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What is the primary purpose of an IRB Layer 3 interface?

A.

to provide load balancing

Answers
A.

to provide load balancing

B.

to provide a default VLAN ID

Answers
B.

to provide a default VLAN ID

C.

to provide inter-VLAN routing

Answers
C.

to provide inter-VLAN routing

D.

to provide port security

Answers
D.

to provide port security

Suggested answer: C

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.

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asked 10/10/2024
Gianni Masaracchia
43 questions
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