You are troubleshooting a trunk link between two Juniper switches. The trunk is configured with `vlan members [10 20]` on both switches. Hosts in VLAN 10 can communicate, but hosts in VLAN 20 cannot. You have verified that VLAN 20 exists on both switches. What is the next most likely cause to investigate?

The native VLAN is set to 20 on one switch and 10 on the other.

VLAN 20 is not in the allowed list on one of the trunk ports.

There is a spanning-tree issue blocking VLAN 20 on one of the switches.

The trunk port on one switch is configured as an access port for VLAN 10.

What is a common symptom of a native VLAN mismatch between two switches connected by a trunk?

The trunk port automatically shuts down.

Tagged frames lose their VLAN tags.

Untagged traffic is placed in the wrong VLAN, potentially causing connectivity issues.

You are examining a frame on a trunk port and see the following: the original Ethernet header is followed by a 4-byte field containing 0x8100 and a VLAN ID of 100. What is the purpose of the 0x8100 value?

It is the priority code point (PCP) value for QoS.

It is the Tag Protocol Identifier (TPID), indicating the frame is 802.1Q tagged.

It is the EtherType of the encapsulated payload.

It is the VLAN ID of the frame.

A host connected to an access port cannot communicate with other devices in the same VLAN. What is the most likely cause?

The native VLAN is mismatched on the access port.

The switch is not forwarding broadcast frames.

The access port is configured with the wrong VLAN ID.

The trunk port is not tagging frames.

Which configuration is required to allow multiple VLANs to traverse a trunk port?

Enable VLAN tagging on the access port.

Configure the port as a trunk port and add the desired VLANs to the allowed list.

Set the port as an access port and assign multiple VLANs.

Use a different VLAN ID for each frame on the same port.

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

Domain 1Objective 4

VLAN Tagging JN0-352 Practice Questions (Page 2)

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 6–10

6expert · hard
You are troubleshooting a trunk link between two Juniper switches. The trunk is configured with `vlan members [10 20]` on both switches. Hosts in VLAN 10 can communicate, but hosts in VLAN 20 cannot. You have verified that VLAN 20 exists on both switches. What is the next most likely cause to investigate?
Select an answer first
7foundation · easy
What is a common symptom of a native VLAN mismatch between two switches connected by a trunk?
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8application · medium
You are examining a frame on a trunk port and see the following: the original Ethernet header is followed by a 4-byte field containing 0x8100 and a VLAN ID of 100. What is the purpose of the 0x8100 value?
Select an answer first
9foundation · easy
A host connected to an access port cannot communicate with other devices in the same VLAN. What is the most likely cause?
Select an answer first
10foundation · easy
Which configuration is required to allow multiple VLANs to traverse a trunk port?
Select an answer first

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