20191324 "Introduction to Information Security professional" learning summary Week 11

Learning content and knowledge Summary:

This week learning the network and the World Wide Web, the network is divided into local, metropolitan and wide area networks. Bandwidth is the data transfer rate, to provide a transmission rate greater than the broadband network technology 128kbps. Open Systems Interconnection Reference Model Layer 7 points: 1. Physical Layer 2 data link layer 3 network layer 4 transport layer 5 session layer 6 presentation layer 7 application layer. IP ping program can be used to test if a computer is active. Currently IPv4 has been distributed. Instant messages are not encrypted. HTML is used to create Web documents.

Learning problems generated in the process and settlement process

Problem: Modem is not only converts computer data into audio data?

Solution: Modem, is an abbreviation of modulator and demodulator, a computer hardware, computer digital signal that can be translated into an analog signal may be transmitted along an ordinary telephone line, and the analog signals are in turn the other end of the line another a receiving modem, and translated into a computer-understandable language. This simple process is complete communication between two computers.