This lesson do we learn for future packages framing and transparent two transmission content.
First let us look at an example of this last lesson talked about, the big Boss network layer does take five documents issued to Company B, he would find a little helper, little helper that this can not go and run errands, she but also to find a little helper. That this little helper ah he is a fool, so she does in the first place, a secretary she took five files in order to prevent a number, so that if a fool to lose this file, for example, lost 4 and Number 5. That in the end the receiving end of it discovered a small secretary Nos. 4 and 5 did not receive, so let fools re-issue # 4 and # 5 on it, which is not to say that the number 51, all five files resend once. So do the data link layer ah in fact, the network layer to deliver its datagrams a processing and handling, and then submitted to the physical layer. This happen, you can achieve a secretary ah, this link is not transformed into a data link error on a logic.
That process is encapsulated in a frame of it, in fact,