Ericsson Exam ECP-206 Topic 2 Question 23 Discussion

Actual exam question for Ericsson's ECP-206 exam

Question #: 23
Topic #: 2

[All ECP-206 Questions]

In an Ethernet frame carrying a VLAN tag, where does the VLAN tag appear?

Aafter the type field

Bbefore the length field

Cbefore the type field

Dafter the length field

Show Suggested Answer

Suggested Answer: C

In an Ethernet frame carrying a VLAN tag, the VLAN tag appears before the type field. A VLAN tag is a 4-byte field that is inserted into an Ethernet frame to indicate the VLAN membership and priority of the frame. The VLAN tag consists of two subfields: the tag protocol identifier (TPID) and the tag control information (TCI). The TPID subfield is a 16-bit field that identifies the frame as an IEEE 802.1Q-tagged frame, with a value of 0x8100. The TCI subfield is a 16-bit field that contains the priority code point (PCP), the drop eligible indicator (DEI), and the VLAN identifier (VID). The VLAN tag appears between the source MAC address and the type fields of the original frame, shifting the type field by four bytes. The type field indicates the type of the payload, such as IP or ARP .

by Ronna at Jul 17, 2024, 06:13 PM

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Jamal

4 months ago

The VLAN tag is like a secret password for the Ethernet frame. It's gotta be before the type field, option C all the way!

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Anthony

2 months ago

I always remember it as the VLAN tag coming before the type field.

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Cassandra

3 months ago

Yeah, option C is the correct placement for the VLAN tag.

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Mayra

3 months ago

I agree, the VLAN tag is definitely before the type field.

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Karima

4 months ago

Wait, isn't the VLAN tag supposed to be invisible so the frame can pass through the firewall undetected? Just kidding, it's clearly before the type field, option C.

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