EXPLAIN BRIEFLY THE RADIO WAVES IN WIRE TRANSMISSION MODE.
Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30khz-300Ghz.
These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic field that pass through the air and the vacuum of space. Information such as sounds, is carried by systematically changing (modulating) . Some property of the radiated waves, such as their amplitude frequency, phase or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. This information in the waves can be extracted and transformed back into its original form.
B. State three (3) advantages of wireless transmission.
I. Doctors, workers and other professional working personnel that are working in remote areas can be in touch with medical center through the help of wireless communication.
II. Communication is enhanced to convey the information quickly to the consumers.
III. Working professional can work and access internet anywhere and anytime without carrying cables or wires wherever they go. This also helps to improve the work anywhere on time and improves the productivity.
IV. An urgent situation can be altered through wireless communication. I.e anybody can receive help and support on urgent/emergency situation through wireless alert, which is also enhancing wireless transmission.
V. It’s very cheap to maintain and install.
State two(2) disadvantages of wireless transmission. [2 marks]
I. It’s very easy for the hackers to grab the wireless signals that are spread in the air.
II. It cost money and risky to secure wireless signals to be accessed against unauthorized users. For instance if you forget your password, it’ll be difficult to have your login details back mostly when you use two factor authentication.
D. MENTION THE TWO (2) SECURITY PROTOCOLS USED TO SECURE WIRELESS COMPUTER NETWORKS. (1 mark)
1) Wi-Fi protected Access (WPA)
2) Wi-Fi protected Access II (WPA