Knowledge points of Network Management in 2014: Chapter 8]

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Chapter 8 network applications

　　8.1 multi-user applications

8.1.1 multi-user applications in LAN

(1) Identity User: The account ID or user ID used to log on to the LAN.

(2) access disk sectors:

(3) Utility files in the root directory;

8.1.2 file sharing and record locking

(1) applications use file sharing and record locking to ensure continuous updates to files;

(2) If the file is locked and the entire time period when the application uses the file is overwritten, other users are prohibited from accessing the file;

(3) multi-user programs use record locking to protect the integrity of data files.

　　8.2 Text Processing

8.2.1 file sharing

8.2.2 trace file

　　8.3 workbooks

(1) Lotus1-2-3 and Microsoft Excel have the ability to make it easier for multiple users to apply workbooks, including providing workbooks

Other users; enable other users to improve the mode; track who has changed the specific part of the workbook.

　　8.4 email

(1) The email system is one of the most widely used and promising network applications.

8.4.1 email and address

(1) An email address consists of two parts: the user's email address and the computer where the user's email address is located.

8.4.2 email information format

(1) email information includes two parts: the header (including information about the sender, receiver, and topic) and the subject.

8.4.3 Email transmission

(1) The Internet mail Transmission standard is simple mail Transmission Protocol (SMTP)

(2) Emails can be distributed, listed, and forwarded;

(3) the TCP/IP protocol cluster contains the Post Office Protocol (POP ).

8.4.4 X. 400 Message Processing System

(1) x.400 is the standard for email application developed by CCITT in 1984;

(2) x.400 packet format: envelope, header, body

(3) The application layer of x.400 In the OSI model can be divided into two layers: the user proxy layer and the message transmission layer;

(4) In a LAN environment, the MTA is not assembled on each node, but a submission and transfer entity (SDE) is assembled under the UA. The node can also

Connect to other MTA instances through the WAN.

　　8.5 online services

(1) online service systems can be divided into the following four categories:

A. Information;

B. Communication;

C. Service;

D. Special Group (SIG)

8.5.1 Home Office

8.5.2 electronic education

(1) the infrastructure of online education in the United States is the e-University Network (EUN)

8.5.3 e-bank

(1) Automatic Deposit/withdrawal (CD/ATM) System

(2) Electronic Remittance System

(3) point-of-sale Automatic Transfer System

　　8.6 Computer Integrated Manufacturing System Network

8.6.1 network characteristics of CIMS

(1) communication characteristics of CIMS

A. Short communication distance

B. Strong real-time communication

C. Communication in heterogeneous environments

D. scalability of communication

E. Inter-process packet communication between heterogeneous machines

(2) Characteristics of the CIMS network

A. Openness

B. Standardization

C. Real-time performance

D. Rich Network Services

I. Virtual Terminal Service

Ii. File Transfer Service

Iii. Network File System (NFS)

Iv. Email

V. Manufacturing message specification (MMS), Virtual Manufacturing Equipment (vmd)

Vi. common programming interfaces:

① Inter-process communication (IPC): A socket-based scocket Communication form

② Remote Procedure Call (RPC)

E. Adapt to the physical and geographical environments of factories

8.6.2 manufacturing automation agreement

(1) Definition

Map is a LAN protocol proposed by General Motors (GM) for manufacturing automation.

(2) MMS has two names: ISO calls it manufacturing message specification or iso9506, while EIA calls it

Maunfacturing messaging service or RS-511

(3) The core of MMS protocol is VMD.

(4) MMS has eight main application functions: context management, processing program transmission management, processing program running control, variable access, and Operation

Staff communication, VMD support, time management and log management

(5) MMS is an asymmetric master-slave communication protocol that uses the concepts of initiators and responders.

(6) MMS adopts a connection-confirmed communication mode. Two MMS users must establish a connection between them before they can establish a connection in the MMS environment.

.

8.6.3 office automation Agreement (top)

(1) The Office file structure (ODA) provides a standard file structure, which aims to deliver texts of any category in addition to wearing and online

In addition, you must be able to regenerate, modify, and process other texts on the other end. ODA generates three-phase documents: editing and sorting

Version process and image process.

(2) combined with common IGES, CGM, and GKS

Top3.0 is called a fully functional office network with its own unique status.

8.6.4 site bus

(1) Definition

Proposed by the International Electronics Technology Commission (IEC), an industrial low-layer device used for interconnection with industrial low-layer devices and serial digital communication

Local Area Network.

(2) The Field Bus refers to the short-term application between the primary automation equipment distributed in the production site and the higher-level automation equipment in the control room.

A digital serial communication link for message transmission.

(3) The SP-50 board specializes in the research of the site bus

(4) differences between H1 and H2 Bus

The main line name is called chain-type electric-air Characteristics

H1 bus point-point communication link 20mA current, maximum carrier frequency is 9600Hz

H2 Bus Multi-point communication link carrier frequency exceeds 100 kHz

8.6.5 point-to-point communication in CIMS

(1) point-to-point communication is a communication method that directly connects a low-level device to its controller for information exchange.

(2) There are many reasons why point-to-point communication is used in CIMS.

A. There are many high-end processing devices in CIMS;

B. Low communication costs and easy implementation

8.6.6 CIMS integrated communication structure

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