1. Data link layer using channel mainly has two types: and radio channel ,
2. LAN still belongs to the scope of the data link layer,
3. The data link layer of the three basic questions: encapsulated into a frame , transparent transmission , error detection ,
4. Link: it is from one node to the adjacent nodes of a physical line, and no other intersection, the middle
5. Data link: when you need to transfer data on a route, besides must have a physical link, there must be some necessary communication protocol to control the transmission of the data, if the implementation of these agreements, hardware and software to link a data link,
6. Using a point-to-point channel data link layer
Point-to-point channel data link layer in the communication of the main steps are as follows:
(1) the nodes of A data link layer, network layer to pay down the IP datagram add encapsulated into A frame first and along the tail,
(2) node sends encapsulated frame node B in the data link layer,
The data link layer (3) if the node B received frame error-free, extract the IP datagram is received from the frame to the network layer above. Otherwise, discard the frame,
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