Where in an ethernet frame will you find a Virtual Local Area Network (VLAN) header? Payload Before the EtherType field Preamble Frame Check Sequence
Question
Where in an ethernet frame will you find a Virtual Local Area Network (VLAN) header?
- Payload
- Before the EtherType field
- Preamble
- Frame Check Sequence
Solution
To determine where you can find a Virtual Local Area Network (VLAN) header in an Ethernet frame, it’s essential to understand the structure of an Ethernet frame.
Ethernet Frame Structure
An Ethernet frame primarily consists of the following fields:
- Preamble
- Destination MAC Address
- Source MAC Address
- EtherType/Length
- Payload (Data)
- Frame Check Sequence (FCS)
VLAN Header Placement
In the case of VLAN tagging, which is compliant with IEEE 802.1Q, a VLAN header is inserted right after the Source MAC Address and before the EtherType field. This VLAN header essentially includes the Tag Protocol Identifier (TPID) and the Tag Control Information (TCI), which are used to identify the VLAN to which the frame belongs.
Answer
Based on this understanding, the correct answer is: Before the EtherType field
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