You have a network with multiple Juniper switches interconnected by trunk links. VLAN 100 is only present on Switch A and Switch C, but not on Switch B, which sits between them. You want to prevent VLAN 100 traffic from consuming bandwidth on the trunk between Switch A and Switch B. What should you do?

Remove VLAN 100 from the allowed VLAN list on the trunk between Switch A and Switch B.

Enable GVRP on all switches to automatically prune VLAN 100.

Configure VLAN 100 as the native VLAN on the trunk between Switch A and Switch B.

Disable the trunk port on Switch B that connects to Switch A.

What is the primary purpose of VLAN pruning on a trunk port?

To reduce unnecessary broadcast and multicast traffic by limiting VLANs to trunks that need them.

To increase the number of VLANs that can be carried on the trunk.

To automatically assign VLANs to access ports.

To encrypt VLAN tags for security.

What is the purpose of the Tag Protocol Identifier (TPID) field in an IEEE 802.1Q VLAN tag?

It indicates the priority of the frame for QoS.

It marks the frame as VLAN-tagged and identifies the tagging protocol.

It specifies the length of the Ethernet frame.

It identifies the VLAN ID of the frame.

You are analyzing a packet capture from a trunk link between two switches. You see a frame with an EtherType of 0x8100 and a VLAN ID of 0x000. What does this indicate?

The frame is untagged and belongs to the native VLAN.

The frame is a priority-tagged frame with no VLAN assignment.

The frame is tagged with VLAN 0, which is a valid VLAN ID.

The frame is corrupted and should be discarded.

Which statement correctly differentiates IEEE 802.1Q from Cisco's ISL tagging?

802.1Q is used only on access ports, while ISL is used on trunk ports.

802.1Q is a proprietary protocol, while ISL is an open standard.

802.1Q supports only a single VLAN per trunk, while ISL supports multiple VLANs.

802.1Q inserts a 4-byte tag inside the frame, while ISL encapsulates the entire frame with a 30-byte header.

Juniper NetworksCertified Specialist, Enterprise Routing and Switching (JNCIS-ENT)

Domain 1Objective 4

VLAN Tagging JN0-352 Practice Questions (Page 1)

Part of the Layer 2 Switching and VLANs domain, which makes up ~15% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~5–9 in this domain), expect 1–1 from this objective — we provide 17 practice questions to prepare you well beyond it. (estimate)

17questions here

4free pages

7concepts

Questions 1–5

1application · medium
You have a network with multiple Juniper switches interconnected by trunk links. VLAN 100 is only present on Switch A and Switch C, but not on Switch B, which sits between them. You want to prevent VLAN 100 traffic from consuming bandwidth on the trunk between Switch A and Switch B. What should you do?
Select an answer first
2foundation · easy
What is the primary purpose of VLAN pruning on a trunk port?
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3foundation · easy
What is the purpose of the Tag Protocol Identifier (TPID) field in an IEEE 802.1Q VLAN tag?
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4expert · hard
You are analyzing a packet capture from a trunk link between two switches. You see a frame with an EtherType of 0x8100 and a VLAN ID of 0x000. What does this indicate?
Select an answer first
5foundation · easy
Which statement correctly differentiates IEEE 802.1Q from Cisco's ISL tagging?
Select an answer first

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