IRIS EDUCATION

Wireless Transmission Media Wireless transmission media are type of media where data is transferred from one place to another without using any wire or cable. Some of the wireless transmission media are as follows: Radio Wave Transmission Bluetooth Wireless Technology Wi-Fi (Wireless Fidelity) Infrared Technology Microwave transmission Radio Wave Transmission Radio waves transmit music, conversations, pictures and data invisibly through the air, often over millions of miles. Radio waves travel in all directions from the source, so that the transmitter and the receiver do not have to be carefully aligned physically. These are easy to generate, can travel long distances and penetrate through buildings easily. The two technologies that use radio frequency waves to create a network are: Bluetooth Wireless Technology Wi-Fi (Wireless Fidelity) Bluetooth Wireless Technology Bluetooth is a wireless technology that lets you talk and share information like music,...

Tokens Tokens are smallest unit of a python program. As we see in chemistry a molecule are made up of combination of elements. Same as we compare in python programming the programs which we write in python are the molecules and the tokens are the elements of python. There are five types of tokens in python: Keywords Identifiers Literals Punctuators Operators Keywords Keywords are nothing but the reserved words which are used by python and have their specific meanings. We are not allowed to use keywords as variables in Python. Keywords in python are case sensitive. Some keywords in python are False, None, True, and, if, class, global, else, finally, for, not, etc. Identifiers Identifiers in python are nothing but user defined names to represent variables, functions, classes, etc. But there are few rules that we have to follow while defining an identifier: You can define the variable using letters (a to z), numbers (0 to 9) or an underscore (_). You cannot use di...

Installing Python Python is free to use, so anybody can download the python application for execution of program. You can download the latest version of python application from www.python.org . If this python executable file doesn’t install in you system then you can download Anaconda application for executing the python code. You have two mode or options for writing the code in python       a) Interactive mode       b) Scripting mode In an interactive mode you can run only single line or one block of code. It runs very quickly and gives the result instantly. Script mode is used when the user needs to write more than one line or block of code. It takes more time to compile. In this mode, one can simply write all the lines of code in a text file, but you have to save that file with .py extension. Writing a python program Python programs must be written in a specific structure. The syntax must be correct or the interpreter...

Transmission Media Transmission media means to send the data from one place to another place through some medium like wire or wireless. The transmission media or medium can be classified into two categories Wired Transmission Media and Wireless Transmission Media. Wired Transmission Media Wired transmission media or medium uses wires or cables to transmit data from one place to another place. In this type of medium we use wires or cables. The data is transferred in the form of electrical or light signal. There are various types of cables that can be used for setting up a network. Some of them are as follows: Twisted Pair Cable Twisted pair cable was invented by Alexander Graham Bell in 1881. It is the most widely used medium for telecommunication. It consists of copper wires that are twisted into pairs. An ordinary telephone wire consists of two insulated copper wires twisted into pairs. Computer networking cables consists of four pair of copper wire that c...

Computer Architecture and Networks Types of Computer Networks There are various types of computer network which are widely used. These networks are classified according to the geographical area coverage. Basically there are four types of computer networks: Personal Area Network (PAN) – A PAN is a computer network which is connected around a person. It is used to communicate between devices like printers, phones, etc. Local Area Network (LAN) – In LAN two or more computers and peripheral devices are connected within a small area such as room, an office building, etc. In LAN computer terminals are physically connected with wires. Metropolitan Area Network (MAN) – A MAN is a network which covers more area than a LAN. It spreads across a city that is why it is called Metropolitan area network. Cable TV, Telephone Networks, etc. are some common example of MAN. Wide Area Network (WAN) – A wide area network is a telecommunication network that spread across cities, count...

Python is a widely used interpreted, interactive, object-oriented and high-level programming language. It was created by Guido Van Rossum in February 20, 1991. Python is a very simple programming language so even if you are new to programming, you can learn python without facing any issues. The syntax of python program is as simple as like maths formula. Now let us learn some key points in the above statement: Interpretable or interpreted – The interpreter is used mostly for scripting languages like python, Visual Basic, Java, etc. which directly executes the code by converting it into an intermediate code (common code) usually called the byte code. This byte code is platform independent which can later be run on different platforms so the code is portable. Interactive – Python is an interactive language because you can see the output of the written command on the python prompt.  Object Oriented – Python supports Object-Oriented style or technique of programming that ...

Components of a network Component means parts, through which the network is made up of, some of them are: Modem – Modem is a device which helps the computer to send the data over networks. Usually the data is transmitted from one place to another place in the form of analog signal, but the computer processes digital data so the modem helps to convert this digital data into analog signal and send this data through telephone line or with the help of some other media. The word modem is derived from the term modulator and demodulator which mean to modulate the digital signal to analog signal and demodulate the analog to digital signal. Network Interface Card – A network interface card connects your computer to a network or the Internet. It is a circuit board installed in a computer. It is also called network interface controller, network adapter or LAN adapter. We connect to network with a unique id called MAC id (Media Access Control), we get this MAC id from the ROM chip which is ...