Some Key Terms

Protocol:

a format in which data is transmitted between two devices. it determines the type of error checking to be used, data compression method (if needed), how the sending device will say that it has finished sending the message, and how the receiving device will say that it has finished receiving the message.


What are the following protocols used for?
TCP/IP, http, smtp, FTP

(see "How To Play Nice")


What does GUI stand for? What was used before GUI?

Graphical User Interface.
radar displays, SAGE (Semi Automatic Ground Environment) and Ivan Sutherland's Sketchpad were used. On-Line System (NLS). Xerox PARC; first computer to demonstrate GUI.


There are two methods of data transmission – serial and parallel. Explain the difference between them.

Serial: transmits data one bit at a time.
parallel: capable of receiving more than one bit at a time.


Define the term “URL”. Explain the components that make up the url.

(see "Internet Addresses")

the protocol: ("http")
the server name: ("www. ... .com")
the file name: (" .. .htm")


In the context of data transmission, what is “error detection”?

a class of techniques for detecting garbled messages.


Name and explain one common method of error detection.

checksum:
the message being transmitted has a numerical value based on the number of bits it has. the receiving device then makes sure that the numerical value is the same. If not, the message is assumed as garbled.


What is HTML and explain why it is important

(see "How To Play Nice")

It is important as it IS the structure and layout of any web page on the world wide web. this blog itself has a html. without it, it wouldnt be a blog, it wouldnt even really be here or exist.