A network operator has configured a virtual switch named VS1 with VLANs 100 and 200. After testing, it is found that hosts in VLAN 100 can communicate with hosts in VLAN 200, but this should not be allowed. The operator confirms that no IRB interfaces are configured. What is the most likely cause of this unexpected communication?

The MAC address table is incorrectly populated, causing frames to be flooded between VLANs.

The VLANs are configured on the same physical interface, which allows Layer 2 forwarding between them.

A routing instance of type virtual-switch does not isolate VLANs from each other at Layer 2.

The virtual switch is configured with a default gateway that routes between the VLANs.

In Junos, what is the primary purpose of a virtual switch routing instance?

To enable routing protocols like OSPF and BGP on a switch

To provide Layer 3 routing between different VLANs

To create a separate Layer 2 forwarding domain with its own VLANs and interfaces

To provide a single broadcast domain for all VLANs on the device

Which Junos configuration stanza creates a virtual switch routing instance?

set bridge-domains vs1 domain-type bridge

set interfaces vs1 unit 0 family ethernet-switching

set routing-instances vs1 instance-type virtual-switch

What is the purpose of an IRB interface in a virtual switch?

To enable Spanning Tree Protocol on the VLAN

To provide a management interface for the switch

To provide a Layer 3 gateway for inter-VLAN routing

To connect the virtual switch to a physical router

How can you verify the forwarding behavior of a virtual switch?

Use the 'show ethernet-switching table' command to view MAC addresses learned on each VLAN

Use the 'show interfaces' command to view interface statistics

Use the 'show configuration' command to view the configuration

Use the 'show route' command to view the routing table

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

Domain 5Objective 4

Virtual Switches 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 19 practice questions to prepare you well beyond it. (estimate)

19questions here

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Questions 11–15

11expert · hard
A network operator has configured a virtual switch named VS1 with VLANs 100 and 200. After testing, it is found that hosts in VLAN 100 can communicate with hosts in VLAN 200, but this should not be allowed. The operator confirms that no IRB interfaces are configured. What is the most likely cause of this unexpected communication?
Select an answer first
12foundation · easy
In Junos, what is the primary purpose of a virtual switch routing instance?
Select an answer first
13foundation · easy
Which Junos configuration stanza creates a virtual switch routing instance?
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14foundation · easy
What is the purpose of an IRB interface in a virtual switch?
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15foundation · easy
How can you verify the forwarding behavior of a virtual switch?
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