Discuss Ericsson ECP-206 Exam Topic 1 Question 8

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

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 .

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16 comments · newest first

Elin 10 months ago

I thought it was after the length field, but I guess not.

Lenna 11 months ago

Yup, definitely before the type field!

Paulina 11 months ago

Wait, is it really before the type field? Sounds off.

Alfreda 11 months ago

Totally agree, it's option C!

Annmarie 11 months ago

The VLAN tag comes before the type field.

Sabine 12 months ago

I feel like the VLAN tag is supposed to be right after the length field, but I can't recall clearly.

Merrilee 12 months ago

I'm a bit confused about the order. Was it before the length field or after the type field?

Winifred 12 months ago

I remember practicing a question like this, and I think the VLAN tag actually appears before the type field.

Salena 1 year ago

I think the VLAN tag comes after the type field, but I'm not entirely sure.

Dominque 1 year ago

Ah, I think I've got it! The VLAN tag appears right after the length field, so I'll choose option D.

Luis 1 year ago

I remember learning that the VLAN tag is inserted between the source address and the type field, so I'll go with option B.

Ty 1 year ago

The VLAN tag is definitely before the type field, so I'll select option C.

Elmira 1 year ago

I'm pretty sure the VLAN tag appears after the type field, so I'll go with option A.

Rebecka 1 year ago

Hmm, I'm a bit unsure about this one. I'll have to think it through carefully before answering.

Cordelia 1 year ago

This question seems straightforward, I think the answer is C - a requirement for container isolation.

Beckie 1 year ago

I feel like option B stands out from the rest, but honestly, all the choices seem a bit similar.

Ericsson ECP-206 Exam - Topic 1 Question 8 Discussion