1. 1 computer network overview

1. 1. 1 Basic concepts of computer networks

1. 1.2 Functions of computer network

1. 1.3 development and present situation of computer network

1. 1.4 computer network standardization and related organizations

1. 1.5 Composition of computer network

1.2 classification of computer networks

1.2. 1 Classify according to the coverage of the network.

1.2.2 by transmission medium

1.2.3 Classification by scope of use

1.2.4 classified by topological structure

1.2.5 Classification according to the communication mode of the network.

1.3 computer network architecture

The basic concept of 1.3. 1

1.3.2 ISO/OSI reference model

1.3.3 OSI communication principle

Disadvantages of 1.3.4 OSI/RM

1.3.5 TCP/IP architecture

Comparison of 1.3.6 OSI and TCP/IP reference models

1.3.7 architecture of five-layer protocol

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Chapter 2 Data Communication and Physical Layer

2. 1 Basic concepts of data communication

2. 1. 1 Basic model of data communication system

2. 1.2 information, data and signals

2. 1.3 analog and digital

2. 1.4 DTE and DCE

2.2 Performance indicators of data communication system

2.2. 1 data transmission rate

bandwidth

Baud rate

time lag

2.2.5 delay bandwidth product

2.2.6 Utilization ratio

error rate

2.3 Channel capacity

2.3. 1 Nyquist criterion

2.3.2 Shannon theory

2.4 data transmission mode

2.4. 1 simplex mode, half-duplex mode and full-duplex mode

2.4.2 Parallel transmission and serial transmission

2.4.3 Synchronous transmission and asynchronous transmission

2.4.4 baseband transmission and frequency band transmission

2.5 data coding and data modulation

2.5. 1 Digital signal coding of digital data

2.5.2 Digital data analog signal coding

2.5.3 Digital signal coding of analog data

2.6 channel multiplexing technology

2.6. 1 frequency division multiplexing

time-division multiplexing

wavelength division multiplex

code division multiplexing

2.7 Digital transmission system

2.7. 1 quasi-synchronous digital hierarchy

2.7.2 synchronous optical network and synchronous digital series

2.8 Physical layer transmission medium

2.8. 1 guided transmission medium

2.8.2 unguided transmission medium

2.9 Functions, models and characteristics of the physical layer

2.9. 1 physical layer function

2.9.2 Physical layer characteristics

Example of physical layer interface standard

RS-232 serial interface standard

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Chapter 3 Data Link Layer

3. 1 Overview of Data Link Layer

3. 1. 1 Basic functions of data link layer

3. 1.2 data link layer service

3.2 Frame synchronization function

3.2. 1 character counting method

3.2.2 Ending and Ending Delimiter Methods for Character Filling

3.2.3 Headend Delimiter Method for Bit Filling

3.3 Flow Control Function

Stop and wait protocol

3.3.2 Post-N-Frame ARQ Protocol

3.3.3 selective retransmission ARQ protocol

sliding window protocol

3.4 Error control function

3.4. 1 error characteristics

3.4.2 Principles of Error Detection and Correction

Error detection code

Error correction code

3.5 Data Link Layer Protocol

High-level data link control program

3.5.2 Internet data link control protocol PPP

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Chapter 4 LAN technology

4. Overview of1LAN

4.2 LAN architecture

4.2. 1 IEEE 802 LAN reference model

4.2.2 Media access control sublayer

4.2.3 logical link control sublayer

4.3 Ethernet Media Access Control Technology

4.3. 1 aloha

4.3.2 CSMA

CSMA/ CD

4.4 Ethernet frame format and data encapsulation

4.4. 1 Ethernet frame format

4.4.2 Ethernet data encapsulation

Addresses in Ethernet

4.5 Ordinary Ethernet

4.5. 1 Traditional Ethernet

4. 5. 2 100 Mbps Ethernet

4.5.3 Gigabit Ethernet

4.5.4 10 Gigabit Ethernet

4.6 Switched Ethernet

4.6. 1 switch

4.6.2 Switched Ethernet and its characteristics

4.7 Virtual LAN

4.7. 1 Virtual LAN concept

4.7.2 Advantages of VLAN over traditional LAN

Types of virtual LAN

4.7.4 Virtual local area network protocol standard

4.7.5 Link type of virtual local area network

4.8 Other LANs

4.8. 1 Token Ring

token bus

4.8.3 FDDI network

4.9 Wireless LAN

4.9. 1 Concept and characteristics of wireless local area network

4.9.2 Major WLAN standards

Architecture of wireless LAN

4.9.4 Media Access Control Mode of WLAN

4.9.5 Establishment of wireless local area network

Security of WLAN

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Chapter V Wan

5. Overview of1WAN

5.2 Data exchange technology of computer network

5.2. 1 circuit switching

Store and forward switching

5.3 WAN access technology

5.3. 1 DSL access technology

Frame relay network

5.3.3 ATM network

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Chapter 6 Network layer

6. 1 network layer overview

6. 1. 1 Functions of the network layer

6. 1.2 Services provided by the network layer

6.2 IPv4 protocol

6.2. Introduction to1IPv4 Protocol

6.2.2 IPv4 address and subnet division

IP datagram format

6.2.4 IP datagram segmentation and reassembly

IP datagram forwarding

6.2.6 Classless Inter-domain Routing

Network address translation

6.3 Network layer protocol

6.3. 1 ARP and RARP

ICMP

6.4 Routing Algorithm and Routing Protocol

6.4. 1 Routing Protocol Classification

6.4.2 Routing Information Protocol

6.4.3 Shortest Path First Routing Algorithm (SPF)

6.4.5 Open Shortest Path First Algorithm (OSPF)

bgp

6.5 Network layer equipment

6.5. 1 Composition and function of router

6.5.2 Routing table

Routing and forwarding

6.6 IPv6 protocol

6.6. Design Defects of1IPv4 Protocol

IPv6 datagram format

6.6.3 IPv6 address structure

6.6.4 Transition technology from IPv4 to IPv6

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Chapter 7 Transport layer

7. 1 overview

7. 1. 1 transport layer function

7. 1.2 transport layer service

7.2 Elements of Transmission Protocol

7.2. 1 transport layer addressing

7.2.2 Establish transmission connection

Release transport connection

7.2.4 Flow Control and Cache

7.3 TCP/IP transport layer

7.3. 1 User Datagram Protocol

User datagram format

7.4 transmission control protocol TCP

7.4. Overview of1TCP

7.4.2 header of TCP segment

7.4.3 TCP data numbering and confirmation

TCP reliability guarantee

TCP flow control

TCP congestion control

7.4.7 TCP transmission connection management

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Chapter 8 Application layer

8. 1 Basic concepts of application layer

8. 1. 1 Main application layer protocols

8. 1.2 network application mode

8.2 Domain Name System

8.2. 1 Internet Domain Name Structure

8.2.2 Domain Name Server

8.2.3 Domain Name Resolution Process

8.2.4 message format of DNS

8.3 file transfer protocol

8.3. Working principle of1FTP

8.3.2 FTP data format

FTP commands and responses

8.3.4 Simple File Transfer Protocol

8.4 Remote Login Protocol

8.4. Working principle of1telnet

8.4.2 Telnet Syntax and Remote Login Implementation

8.5 e-mail

8.5. 1 composition of e-mail system

8.5.2 E-mail format and MIME

SMTP and POP3

8.6 World Wide Web

8.6. 1 Working principle of World Wide Web

8.6.2 Uniform Resource Locator

Hypertext transfer protocol

8.7 Dynamic Host Configuration Protocol

8.7. Common terms of1DHCP

The working process of DHCP

8.8 Simple Network Management Protocol

8.8. 1 SNMP network management system

SNMP

Management information structure

8.8.4 Management information base

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Chapter IX Network Security

9. 1 Network Security Overview

9. 1. 1 Common network attack methods

9. 1.2 network security service

9. 1.3 network security mechanism

9.2 Data encryption technology

9.2. 1 symmetric key cryptosystem and DES algorithm

9.2.2 Public key cryptosystem and RSA algorithm

9.3 Digital Signature and Message Digest

9.3. 1 digital signature

Message summary

9.4 Computer virus

9.4. 1 The concept of computer virus

9.4.2 Characteristics of Computer Virus

9.4.3 Computer Virus Classification

9.4.4 Prevention and Control of Computer Virus

9.5 firewall technology

9.5. 1 Basic concept of firewall

Firewall architecture

Limitation of firewall

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refer to