Bandwidth and Broadband
What is bandwidth and broadband?
Answer: Bandwidth: Bandwidth is the capacity of a wired or wireless network communications link to transmit the maximum amount of data from one point to another over a computer network or internet connection in a given amount of time -- usually one second. Synonymous with capacity, bandwidth describes the data transfer rate. Bandwidth is not a measure of network speed -- a common misconception.
While bandwidth is traditionally expressed in bits per second (bps), modern network links have greater capacity, which is typically measured in millions of bits per second (megabits per second, or Mbps) or billions of bits per second (gigabits per second, or Gbps).
Bandwidth connections can be symmetrical, which means the data capacity is the same in both directions to upload or download data, or asymmetrical, which means download and upload capacity are not equal. In asymmetrical connections, upload capacity is typically smaller than download capacity.
Broadband: In contrast, when you connect to the Internet via a broadband Internet connection, the process is slightly different. Once your PC is connect ISP through a cable or DSL connection, it remains connected until the cable box or DSL line is disconnected or physically unplugged. A DSL connection runs through unused wires in your existing phone line without disruption and can translate data at 5 million bytes per second, or 5Mbps. Broadband services are often referred to as "always on” services because it is not necessary to make a setup call to your ISP each time you wish to access the Internet; this means that once you are assigned an IP address, you keep it until you request it to be changed.
What is E-mail? Write the advantages of E-mail.
Answer: E-mail: Full meaning of e-mail is electronic mail by the system of computer networking different types of data transmission method are used. This data transmission types are called email or mail.
E-mail is an online correspondence system. With e-mail you can send and receive instant electronic messages, which work like writing letters. Your messages are delivered instantly to people anywhere in the world, unlike traditional mail that takes a lot of time. Some famous name of E-Mail Services organizations Gmail.com, yahoo mail.com, Hotmail.com, OVI mail.com
Online mail: In which mailing system user internet all time is necessary for connect is called on-line mail. Ex: yahoo.com.googl.com
Off-line mail: In which mailing system user, internet is not necessary all time connection is called off-line mail. Ex: out-look, express etc.
Advantage of E-mail:
a) It is faster than paper mail.
b) Instant communication.
c) E-mail document can be stored in a computer.
d) Low cost
e) High security
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