If The Vlan Tag Is Present In An Ethernet Frame What Is The Maximum Frame Size

The minimum size of the ethernet frame with 802 1q tagging is 68 bytes. Because inserting the vlan tag changes the frame 802 1q encapsulation forces a recalculation of the original frame check sequence field in the ethernet trailer.

Ethernet Frame Wikipedia

When placing a vlan tag also known as an ieee 802 1q tag on the ethernet frame the four bytes of data which make up the vlan tag are inserted before the type field as shown in the following figure.

If the vlan tag is present in an ethernet frame what is the maximum frame size. When a q tag is present the minimum data field size is reduced to 42 bytes maintaining a minimum frame size of 64 bytes. The ieee 802 3ac standard increased the maximum ethernet frame size from 1518 bytes to 1522 bytes to accommodate the four byte vlan tag. If you are using the switch defaults for vlans the vlan tag that will be placed on the frame is vlan1.

In addition all four ethernet frame types may optionally contain an ieee 802 1q tag to identify what vlan it belongs to and its priority quality of service. If the vlan tag is present in an ethernet frame what is the maximum frame size. Figure depicts vlan ethernet frame mentioning the same with.

Because of the extra 4 byte tag the minimum ethernet ii frame size increases from 64 bytes to 68 bytes while the maximum ethernet ii frame size now becomes 1522 bytes. The field can have a value between 0 and 4095. A 4 byte long q tag is inserted in an ethernet frame between the source address and the type length field to identify the vlan to which the frame belongs.

This encapsulation is defined in the ieee 802 3ac specification and increases the maximum frame by 4 octets. 1522 bytes what utility is the equivialent to the pathping command on a linux system. Start studying chapter 4 network protocols and routing.

It uniquely identifies the vlan to which the frame belongs. Therefore the resulting ethernet frame can be as large as 1522 bytes. When a q tag is present the minimum data field size is reduced to 42 bytes maintaining a minimum ethernet frame size of 64 bytes.

Learn vocabulary terms and more with flashcards games and other study tools. The vlan identifier is a 12 bit field. If the vlan tag is present in an ethernet frame what is the maximum frame size.

By default what is the mtu size on a typical ethernet network. The 802 1q tag is 4 bytes. A 4 byte long q tag is inserted in an ethernet frame between the source address and the length type field to identify the vlan to which the frame belongs.

The 4 byte tag we mentioned is inserted within the existing ethernet frame right after the source mac address as illustrated in the diagram below.

4 The Ethernet Frame And Full Duplex Mode Ethernet The