Why LLC and SNAP headers are used?

Why LLC and SNAP headers are used?

The SNAP header is used when the LLC protocol carries IP packets and contains the information which would otherwise have been carried in the 2-byte MAC frame type field.

What is an LLC header?

The LLC Header consist of DSAP (Destination Service Access Point), SSAP (Source Service Access Point) and the Control field. The two 8-bit fields DSAP and SSAP allow multiplexing of various upper layer protocols above LLC.

What is an Ethernet SNAP frame?

From Wikipedia, the free encyclopedia. In computer networking, an Ethernet frame is a data link layer protocol data unit and uses the underlying Ethernet physical layer transport mechanisms. In other words, a data unit on an Ethernet link transports an Ethernet frame as its payload.

What does SNAP stand for in networking?

SubNetwork Access Protocol
SubNetwork Access Protocol (SNAP) refers to a standard used for transmitting IP datagrams across IEEE 802 networks. This means that the IP datagrams can be routed on IEEE 802 networks encapsulated inside the SNAP data link layers 802.3, 802.4 or 802.5, physical network layers, and the 802.2 LLC.

What is LLC in Ethernet?

The logical link control (LLC) is the upper sublayer of the data link layer of the open system interconnections (OSI) reference model for data transmission. It acts act an interface between the network layer and the medium access control (MAC) sublayer of the data link layer.


Logic Link Control (LLC) Layer and Medium Access Control (MAC) layers are the sublayers of the Data link layer in the OSI reference model. OSI reference model: It stands as Open Systems Interconnection. OSI is a 7 layer architecture which contains 7 layers. Each layer has its own specific functionality.

What is LLC sub layer?

The LLC sublayer provides multiplexing mechanisms that make it possible for several network protocols (e.g. IP, IPX and DECnet) to coexist within a multipoint network and to be transported over the same network medium. It can also provide flow control and automatic repeat request (ARQ) error management mechanisms.

What is the minimum Ethernet frame size?

64 bytes
Hence the minimum frame size for the IEEE 802.3 (Ethernet) is 64 bytes.

What is snap IP?

Snapchat does not publicly display your actual IP address, though it uses it internally. It does not disclose the IP address of its users since it takes the security and privacy of its users very seriously.

What is snap packet?

Snap is a software packaging and deployment system developed by Canonical for operating systems that use the Linux kernel. The packages, called snaps, and the tool for using them, snapd, work across a range of Linux distributions and allow upstream software developers to distribute their applications directly to users.