Ethernet II is the type of Ethernet framing used for TCP/IP and DECnet. Ethernet II is also known as Ethernet DIX (Digital, Intel, Xerox) because it was developed by these three companies. It is the most commonly used Ethernet framing format in modern networks.

Ethernet II Frame Format:
The Ethernet II frame format consists of several fields, including the Destination MAC Address, Source MAC Address, EtherType, and Data.

1. Destination MAC Address: This field specifies the MAC address of the intended recipient of the frame. It is a 6-byte (48-bit) field.

2. Source MAC Address: This field specifies the MAC address of the sender of the frame. It is also a 6-byte (48-bit) field.

3. EtherType: This field indicates the type of protocol encapsulated within the Ethernet frame. For TCP/IP, the EtherType value is 0x0800, which indicates that the payload is an IPv4 packet. For DECnet, the EtherType value is 0x6003.

4. Data: This field contains the payload of the Ethernet frame, which can be an IPv4 packet for TCP/IP or a DECnet packet for DECnet.

Advantages of Ethernet II:
- Ethernet II is widely supported by network devices and operating systems, making it the de facto standard for TCP/IP networks.
- It has a simple and straightforward frame format, which makes it efficient for processing in network devices.
- The EtherType field allows for the identification of different protocols within the Ethernet frame, enabling the network devices to handle the frames accordingly.

Other Ethernet Framing Formats:
a) Ethernet 802.3: This framing format is used by older Ethernet networks, such as 10BASE5 and 10BASE2. It uses a different frame format with a Length field instead of the EtherType field.

b) Ethernet 802.2: This framing format is used by IEEE 802.2 Logical Link Control (LLC) protocol, which is often used in older token ring networks.

c) Ethernet SNAP: This framing format is an extension of Ethernet II and is used for encapsulating protocols that have their own EtherType values, such as Novell IPX and AppleTalk.

In summary, Ethernet II is the Ethernet framing format commonly used for TCP/IP and DECnet in modern networks due to its wide support and simplicity. It provides a straightforward frame format with the EtherType field for protocol identification.