A service provider is deploying a new customer edge device that must route between three VLANs on the same switch. The network engineer wants to use IRB interfaces to provide Layer 3 gateways for each VLAN. Which configuration step is required to enable routing between the VLANs?

Create a single IRB interface and assign it to all three VLANs using the vlan-id list command.

Configure the IRB interfaces with the same IP address but different VLAN IDs to conserve address space.

Assign a physical interface to each VLAN and configure a separate routing instance for each physical interface.

Create a VLAN for each subnet and assign an IRB interface to each VLAN, then ensure the IRB interfaces are in the same routing instance.

How does an IRB interface handle traffic that arrives on a Layer 2 port and is destined for a different VLAN?

The frame is flooded to all ports in the source VLAN.

The frame is forwarded at Layer 2 to the destination MAC address in the same VLAN.

The frame is sent to the IRB interface, which routes it to the destination VLAN at Layer 3.

The frame is dropped because IRB interfaces only handle traffic within the same VLAN.

A network administrator is configuring IRB on a Juniper EX switch. They have created a VLAN named 'Sales' with vlan-id 30 and an IRB interface irb.30 with IP 192.168.30.1/24. They want to associate the IRB interface with the VLAN. Which command should they use?

set vlans Sales routing-interface irb.30

set interfaces irb unit 30 family inet address 192.168.30.1/24

set vlans Sales interface irb.30

set vlans Sales l3-interface irb.30

A network engineer is explaining IRB to a junior colleague. Which statement accurately describes the purpose of IRB in a Juniper environment?

IRB allows a single physical interface to route between multiple VLANs by creating a virtual Layer 3 interface for each VLAN.

IRB allows a switch to forward Layer 2 frames between VLANs without any Layer 3 processing.

IRB is a routing protocol that exchanges VLAN information between switches.

IRB is used to create a single broadcast domain for all VLANs, simplifying network design.

A service provider has configured IRB interfaces on a Juniper MX router to provide gateway services for multiple customer VLANs. After a recent change, hosts in VLAN 100 can reach the IRB interface but cannot reach hosts in VLAN 200. The IRB interfaces for both VLANs are in the same routing instance. What is the most likely cause?

The IRB interfaces are in different routing instances.

The VLAN 200 subnet is not in the routing table of the routing instance.

The IRB interface for VLAN 200 is not assigned to the VLAN.

The VLAN 200 IRB interface has a /32 mask.

Juniper NetworksCertified Specialist, Service Provider Routing and Switching (JNCIS-SP)

Domain 5Objective 8

Integrated Routing and Bridging (IRB) JN0-364 Practice Questions (Page 3)

Part of the Layer 2 Bridging and VLANs domain, which makes up ~11% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~4–7 in this domain), expect 1–1 from this objective — we provide 15 practice questions to prepare you well beyond it. (estimate)

15questions here

3free pages

5concepts

Questions 11–15

11application · medium
A service provider is deploying a new customer edge device that must route between three VLANs on the same switch. The network engineer wants to use IRB interfaces to provide Layer 3 gateways for each VLAN. Which configuration step is required to enable routing between the VLANs?
Select an answer first
12foundation · easy
How does an IRB interface handle traffic that arrives on a Layer 2 port and is destined for a different VLAN?
Select an answer first
13application · medium
A network administrator is configuring IRB on a Juniper EX switch. They have created a VLAN named 'Sales' with vlan-id 30 and an IRB interface irb.30 with IP 192.168.30.1/24. They want to associate the IRB interface with the VLAN. Which command should they use?
Select an answer first
14application · medium
A network engineer is explaining IRB to a junior colleague. Which statement accurately describes the purpose of IRB in a Juniper environment?
Select an answer first
15expert · hard
A service provider has configured IRB interfaces on a Juniper MX router to provide gateway services for multiple customer VLANs. After a recent change, hosts in VLAN 100 can reach the IRB interface but cannot reach hosts in VLAN 200. The IRB interfaces for both VLANs are in the same routing instance. What is the most likely cause?
Select an answer first

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