What are the main aspects of computer network?

3. Network technology

3. 1 network architecture

network topology

Site inspection /RM

Application layer protocols (FTP, TELNET, SNMP, DHCP, POP, SMTP, HTTP).

Transport layer protocols (TCP, UDP)

Network layer protocol IP(IP address, subnet mask)

Data link layer protocols (ARP, RARP, PPP, SLIP)

physical address

3.2 Coding and transmission

3.2. 1 modulation and coding

AM, FM, PM, AM

PCM, sampling

transmission technology

Communication mode (simplex/half duplex/full duplex, serial/parallel, 2-wire /4-wire)

Error control (CRC, Hamming code, parity check, bit error rate)

Synchronization control (start-stop synchronization, synchronization synchronization, symbol synchronization,? Synchronization)

Multiplexing (FDM, TDM, WDM)

Compression and decompression methods (JEPG, MPEG, MH, MR, MMR, run length)

Transmission control

Competition system

Polling/selection system

Basic program, multi-link program, transmission control character, line control

High-level Data Link Control (high-level data link control)

3.2.4 Switching technologies (circuit switching, store and forward, packet switching, ATM switching, etc.). )? Relay)

3.2.5 Public networks and leased lines

3.3 Network

3.3. 1 network classification

Classification by geographical scope (local area network, metropolitan area network, wide area network)

Classification by service (Internet, Intranet)

Classification by transmission media (telephone, data, video)

Classification by telecommunication network (site, access, backbone)

local area network

LAN topology (bus, star, token bus)

Access Control System (CSMA/ CD, Token Ring, Token Bus)

Connection between LANs, LAN-WAN connection, point-to-point connection and point-to-point connection.

High-speed LAN technology (Gigabit Ethernet)

WLAN

3.3.3 MAN general structure

3.3.4 WAN and remote transmission services

Dedicated line service, line switching service, packet switching service.

ISDN, VPN, frame relay, ATM, IP connection service.

Satellite communication service, mobile communication service and international communication service.

3.3.5 Internet

Internet concept (Internet interconnection equipment, TCP/IP, IP routing, DNS, proxy server)

E-mail (agreement, mailing list)

Web(HTTP, browser, URL, HTML, XML)

File transfer (FTP)

Search engines (full-text search, directory search, intelligent search)

QoS、CGI、VoIP

3.3.6 Access network and access technology

Network nature

Calculate line performance (transmission speed, line utilization rate, line capacity, traffic volume and flow design)

Performance assignment

Application of queuing theory

3.4 Network communication equipment

3.4. 1 transmission medium and communication cable

Wired/wireless media (twisted pair, coaxial cable, optical fiber; Radio waves, light, infrared rays)

Sub distribution frame (IDF) and main distribution frame (MDF)

3.4.2 All kinds of communication equipment

Line terminal equipment, multiplexing equipment, switching equipment and switching equipment.

Line connection equipment (modem, DSU, NCU, TA, CCU, PBX)

3.5 Network connection equipment

Internet connection equipment (network card, bridge, spanning tree bridge, source routing bridge, router, repeater, hub, switch)

3.6 Network software system

3.6. 1 network operating system

Function, classification and characteristics of network operating system

Network device driver (ODI, NDIS)

System function call of network communication (socket API)

Remote position control

TP monitor

distributed file system

* * * Enjoy network equipment.

administration of networks

Functional domains of network management (security management, configuration management, fault management, performance management and billing management)

Network management protocols (CMIS/CMIP, SNMP, RMON, MIB-II)

Network management tools (ping, traceroute, NetXray, analyzer, sniffer)

Network management platforms (OpenView, NetView, SunNet, Manager)

Distributed network management

3.6.3 Network Applications and Services

World Wide Web

FTP file transfer

e-mail

A standard protocol for remote connection service or software (which can be a verb) that implements this protocol.

Online video

Network conference

distance learning

E-commerce / electronic commerce

e-government

CSCW group

4. Network security

4. 1 safety calculation

4. 1. 1 confidentiality and integrity

Private key and public key encryption standards (DES, IDES, RSA)

Authentication (digital signature, identity authentication)

Honesty (sand,)

Access control (access rights, passwords)

4. 1.2 illegal intrusion and virus protection

firewall

intrusion detection

Virtual private network, VLAN

Security protocols (IPSec, SSL, ETS, PGP, S-HTTP, TLS)

Hardware security

Computer virus protection

4. 1.3 Availability

Backup and recovery of files

4. 1.4 safety protection

Personal information control

not reveal one's name

Untraceable

4. 1.5 LAN security

Network equipment reliability

Coping with natural disasters

environmental safety

UPS

4.2 Risk management

Risk analysis and assessment

Risk response measures

Risk prevention (risk transfer, risk fund, computer insurance)

Accident plan (accident category, action plan for handling accidents)

4.2.3 Internal control

Safety rules and regulations

Security policy and security management

5. Standardization knowledge

5. 1 formulation and acquisition of standards

5. 1. 1 standard formulation and acquisition process

5. 1.2 standardization of environmental and safety assessment

5.2 Standardization of information system infrastructure

5.2. 1 standard

International standards (ISO, IEC) and American standards (ANSI).

national standard

Industry standards and enterprise standards

5.2.2 Open systems (X/Open, OSF, POSIX)

5.2.3 Data exchange standard (EDIFACT, SETP, XML)

safty standard

Information system security measures

Computer antivirus standard

Computer anti-illegal access standard

Cc standard

information security certification

5.3 Standardization Organization

International Organization for Standardization (ISO, IEC, IETF, IEEE, IAB, W3C)

American organization for standardization

European organization for standardization

China National Standardization Committee

6. Basic knowledge of informatization

Information consciousness

Global informatization trend, national informatization strategy, enterprise informatization strategy and strategy.

Basic knowledge of enterprise information resource management

Internet-related laws and regulations knowledge

Personal information protection rules

7. Computer English

Master the basic vocabulary of computer technology

Be able to read and understand English materials in computer field correctly.

Examination subject 2: network system design and management

Analysis and Design of Network System

1. 1 network system requirements analysis

Analysis of application requirements of 1. 1. 1

Survey of application requirements (application system performance, information industry and receiving point, data volume and frequency, data type and data flow direction)

Network application analysis

1. 1.2 existing network system

Investigate the existing network system structure (number and location of servers, number and location of clients, number of simultaneous accesses, number of users per day). Time of each use, data quantity of each data transmission, period of network congestion, adopted protocol, communication mode)

Analysis of existing network architecture

1. 1.3 demand analysis

Functional requirements (functions to be realized)

Communication requirements (desired communication mode)

Performance requirements (desired performance)

Reliability requirements (expected reliability)

Safety requirements (safety standards)

Maintenance and operation requirements (operation and maintenance costs)

Management Requirements (Management Policy)

Design of 1.2 network system

1.2. 1 investigation and evaluation of technology and products

gather information

Comparative study of adopted technologies and products.

Comparison of adopted technologies and equipment.

1.2.2 design of network system

Confirm agreement

Determine the topological structure

Determine the connection (communication performance of the link)

Determine the node (the processing capacity of the node)

Determining the performance of the network (performance simulation)

Determination of reliability measurement

Determine the safety measures (investigate the safety measures and evaluate the technology and equipment to realize the safety measures)

The selection of network equipment, the formulation of selection criteria (cost, performance, capacity, throughput and delay), the consistency of performance indicators, the necessity of advanced testing, and the confirmation of interconnection.

1.2.3 new network business operation plan

1.2.4 design review

Construction and test of 1.3 network system

Install 1.3. 1

Prepare in advance

Process supervision

1.3.2 testing and evaluation

Connection test

safety test

performance trial

1.3.3 Work plan for switching to the new network

2. Operation, maintenance, management and evaluation of network system

2. 1 network system operation and maintenance

2. 1. 1 user metric

User management, user training and user consultation

2. 1.2 Formulate maintenance and upgrade strategies and plans.

Determine the strategy

Establishment of equipment

:: Review time

Upgrade time

2. 1.3 Implementation of maintenance and upgrade

Key points of external contract

Internal realization point

2. 1.4 backup and data recovery

Data storage and processing

support

data recovery

2. 1.5 network system configuration management

facility management

software management

Network configuration diagram

2.2 Management of network system

2.2. 1 network system monitoring

Network management protocols (SNMP, MIB-2, RMON)

Using tools to monitor network performance (LAN controller)

Use tools to monitor network failures.

Using tools to monitor network security (intrusion detection system)

Checkpoints for performance monitoring

Home inspection of safety monitoring

Fault recovery analysis

Key points of fault analysis (LAN monitoring program)

Main points of troubleshooting

Key points of writing fault report

2.2.3 system performance analysis

Key points of system performance

2.2.4 Countermeasures for potential safety hazards

Analysis of potential safety hazards (investigating losses, collecting safety information and finding out the reasons)

Key points of intrusion detection

Key points of dealing with computer virus (anti-virus measures)

2.3 Evaluation of network system

2.3. 1 system evaluation

Limitation of system capacity

Analysis of potential problems

Key points of system evaluation

2.3.2 Suggestions for system improvement

System life cycle

System economic benefit

Scalability of the system

Put forward the main points of improving the system.

3. Implementation technology of network system

3. 1 network protocol

Commercial network protocols (SNA/APPN, IPX/SPX, AppleTalk, TCP/IP).

Commercial protocol (XML, CORBA, COM/DCOM, EJB)

Web services (WSDL, SOAP, UDDI)

3.2 Reliability design

Hardware high reliability technology

Software high reliability technology

High reliability technology of system maintenance

fault-tolerant technique

Communication quality

3.3 Network facilities

3.3. 1 xDSL modem

ISDN router

connect

Function (non-communication control function, NAT function)

3.3.3 FRAD (frame assembly/disassembly) and cladding (battery assembly/disassembly)

connect

function

Remote access server

Function and mechanism

3.3.5 Office Personal Handheld System (PHS)

Functional characteristics of digital cordless telephone

Relay hub

Two-speed hub (function and mechanism)

3.3.7 Functions and mechanisms of L2, L3, L4 and multilayer switches

3.3.8 IP router function and control

3.3.9 Virtual Network (Function and Mechanism)

3.3. 10 and other protocols (multi-protocol router, IP tunnel)

3.4 Network application services

3.4 1 address service

Mechanism, DHCP, IPv6 (mechanism and transmission technology)

3.4.2 Domain Name System (Function, Mechanism)

Domain name, FQDN

3.4.3 E-mail (function, mechanism)

SMPT, pop music, mime, IMAP4, LDAP

Mailing list

Internet mail

3.4.4 Electronic News (Function and Mechanism, NNTP)

3.4.5 Network service (function and mechanism, HTTP)

3.4.6 Load Distribution (Network Switching)

3.4.7 Electronic authentication (function, mechanism, authentication authorization, electronic certificate)

3.4.8 Service mechanism

Service provider, provider roaming service, dial-up IP connection, CATV connection, IPD telephone, Internet broadcasting, e-commerce, e-government, mobile communication, EZweb, host service provider, EDI (rules, forms, Web EDI), B2B, B2C, ASP.

, data center

4. New network technology

4. 1 optical fiber network

ATM-PDS、STM-PDS

passive optical network, pon

4.2 Wireless Network

Mobile phone system (WLL, WCDMA, CMDA2000, TD-SCDMA)

High-speed fixed wireless access (FWA)

802. 1 1a、802. 1 1b、802. 1 1g

Microwave access (MMDS LMDS)

Satellite access

Bluetooth access