COMP 3203 Lecture Notes - Lecture 2: International Organization For Standardization, Network Layer, Internet Protocol Suite
26 Oct 2018
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Document Summary
International standards organization (iso), 1983: academically important but largely ignored, tcp/ip - transmission control protocol/internet protocol. Invented by cerf and kahn, 1974, refined by others: tcp/ip is the dominant architecture, practically important but difficult to describe, osi. Iso (international standards organization) had the following guidelines in mind: one layer for each level of abstraction. Layers perform well-defined functions: minimum of information flow between layers (i. e. , simple interfaces) Layers can be easily standardized: osi has 7 layers, physical layer concerned with transmission of unstructured bit stream over a physical medium. Implements a virtual bit pipe: has no idea what the bits" (cid:373)ea(cid:374, module that performs these functions is generally called a modem, data link converts unreliable bit pipe to virtual communication link, sends packets asynchronously but error-free. Includes error detection and correction, framing (used to recognize the beginning and end of packet), retransmission strategies.
