What is the EtherType in an Ethernet frame used for?

What is the EtherType in an Ethernet frame used for?

EtherType is a two-octet field in an Ethernet frame. It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed. The same field is also used to indicate the size of some Ethernet frames.

What is length in Ethernet frame?

To recap, Ethernet has a minimum frame size of 64 bytes, comprising an 18-byte header and a payload of 46 bytes. It also has a maximum frame size of 1518 bytes, in which case the payload is 1500 bytes. If the message to be sent leads to a frame size of less than the 64-byte minimum, the additional bytes are padded.

Why is Ethernet frame size 1518 or 1522?

With the normal untagged Ethernet frame overhead of 18 bytes, the Ethernet maximum frame size is 1518 bytes. If a 1500 byte IP packet is to be carried over a tagged Ethernet connection, the Ethernet frame maximum size needs to be 1522 due to the larger size of an 802.1Q tagged frame.

Why is there a minimum length to the wired Ethernet frame?

Since data travels at a finite speed a minimum packet size was required to ensure that if a collision happens it happened everywhere. The larger you make the minimum packet size the larger and/or faster you can make the network before CSMA/CD breaks down.

What are the 6 parts of an Ethernet frame?

Brief overview on Extended Ethernet Frame (Ethernet II Frame) :

• DA [Destination MAC Address] : 6 bytes.
• SA [Source MAC Address] : 6 bytes.
• Type [0x8870 (Ethertype)] : 2 bytes.
• DSAP [802.2 Destination Service Access Point] : 1 byte.
• SSAP [802.2 Source Service Access Point] : 1 byte.
• Ctrl [802.2 Control Field] : 1 byte.

What are the minimum and maximum frame sizes for Ethernet frames Why can’t the minimum frame length be zero?

The original Ethernet IEEE 802.3 standard had set the minimum Ethernet frame size as 64 bytes and the maximum as 1518 bytes. The maximum was later increased to 1522 bytes to allow for VLAN tagging. The minimum size of an Ethernet frame that carries an ICMP packet is 74 bytes.

What is the minimum and maximum frame length for 10 Mbps Ethernet?

The minimum frame length for 10 Mbps • The minimum frame length for 10-Mbps Ethernet is 64 bytes; the maximum is 1518 bytes. The slot time for 10-Mbps Ethernet is 51.2 μs.

What is the smallest size of an Ethernet frame?

64 bytes
Ethernet minimum packet size is 64 bytes for 10/100M but 512 bytes for 1000M. Minimum packet size is chosen on the basis that in case of half duplex, the sender should be able to detect collision before it finishes sending the frame.

How many bytes does an Ethernet frame need?

However, as the minimum payload of an Ethernet frame is 46 bytes, a protocol which uses EtherType must include its own length field if that is necessary for the recipient of the frame to determine the length of short packets (if allowed) for that protocol.

What is the EtherType field in Ethernet frames?

Jump to navigation Jump to search. field in Ethernet frames indicating which protocol is encapsulated in the payload. EtherType is a two-octet field in an Ethernet frame. It is used to indicate which protocol is encapsulated in the payload of the frame. The same field is also used to indicate the size of some Ethernet frames.

How big of a frame can EtherType be used for?

The size of the payload of non-standard jumbo frames, typically ~9000 Bytes long, falls within the range used by EtherType, and cannot be used for indicating the length of such a frame.

What does the EtherType 0x0806 mean on Ethernet?

Likewise, an EtherType of 0x0806 indicates an ARP frame, 0x86DD indicates an IPv6 frame and 0x8100 indicates the presence of an IEEE 802.1Q tag (as described above). The most common Ethernet Frame format, type II.