How does Q-in-Q typically interact with spanning-tree protocols (STP) in a service provider network?

STP frames are dropped at the provider edge

STP runs on the outer VLAN tag, and customer STP frames are encapsulated

STP is disabled on the provider network to avoid loops

STP runs independently for each customer VLAN

When a frame enters a Q-in-Q-enabled interface, what happens to the original customer VLAN tag?

It is used to determine the outer tag value

It is kept as the inner tag, and a new outer tag is added

It is removed and replaced with the service provider tag

It is encrypted to protect the customer's VLAN ID

A service provider wants to offer a transparent LAN service to multiple customers, each with their own VLAN IDs that may overlap. The provider needs to keep each customer's traffic isolated in the provider network. Which technology is most appropriate for this requirement?

VLAN translation on each provider switch

Q-in-Q tunneling (provider bridging)

What is the primary purpose of provider bridging (Q-in-Q) in a service provider network?

To replace the need for IP routing between customer sites

To enable multiple customers to use the same VLAN ID space independently on a shared infrastructure

To encrypt customer traffic as it traverses the provider network

To reduce the size of Ethernet frames by removing unnecessary VLAN tags

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

Domain 5Objective 5

Provider Bridging (Q-in-Q Tunneling) JN0-364 Practice Questions (Page 2)

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 14 practice questions to prepare you well beyond it. (estimate)

14questions here

3free pages

7concepts

Questions 6–10

6foundation · easy
How does Q-in-Q typically interact with spanning-tree protocols (STP) in a service provider network?
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7foundation · easy
When a frame enters a Q-in-Q-enabled interface, what happens to the original customer VLAN tag?
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8application · easy
A service provider wants to offer a transparent LAN service to multiple customers, each with their own VLAN IDs that may overlap. The provider needs to keep each customer's traffic isolated in the provider network. Which technology is most appropriate for this requirement?
Select an answer first
9foundation · easy
Which Junos statement is used to define the outer VLAN tag for a Q-in-Q interface?
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10foundation · easy
What is the primary purpose of provider bridging (Q-in-Q) in a service provider network?
Select an answer first

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