Network Technology Tutorials Notes (6)

<title>Network architecture</title> Network Architecture 1. Overview of the computer network 1.1 generation

• ◇ the 1950s ago: integration of computer technology and communication technologies
• ◇ the 1950s to 70 mid-term: appanet
• ◇ the 1970s: OSI seven layer model and TCP/IP system
• ◇ starting from the 1990s: Internet

2. Definition of the computer network

The computer network is defined as "a collection of autonomous computer systems interconnected in a way that enables mutual sharing of resources", mainly in the following points:

• ◇ The purpose is to realize the sharing of computer resources
• ◇ multiple independent "autonomous computers" distributed in different geographical locations
• ◇ communication must follow the common network protocol

3. Performance of the computer network

• 0 Rate
• 0 bandwidth
• 0 throughput Rate
• 0 delay
  
  • → transmit delay = data frame length/channel bandwidth
  • → propagation delay = Channel length/propagation rate of electromagnetic waves on the channel
  • → Processing time delay
  • → Queue delay
• 0 round-Trip time
• 0 utilization

4. Network protocols

The data and control information must be exchanged between each node in the computer network, and the rules of the data can be accurately defined in terms of format and timing.
Rules, conventions, and standards for network data exchange are called network protocols.

For example, two people talk, you speak Chinese, he speaks Arabic, that will create an understanding problem.

• 0 syntax
• 0 semantics
• 0 timing

5. The definition of the network architecture and the advantages of the hierarchical structure

• ◇ each layer is independent
• ◇ Good flexibility
• ◇ The structure can be separated
• ◇ easy to implement and maintain
• ◇ can promote standardization work

6. Common Network Architecture

1. Sna
2. Dna
3. Dca
4. Osi
5. Tcp / ip

7.OSI Models

7.1 Data Solution Encapsulation

7.2 Service Access Point

8.TCP/IP Architecture

Simulation Exercises

(1) C

(2) B
(3) C
(4) A
(5) B
(6) B

(7) C

(8) D

Network Technology Tutorials Notes (6)