This week of study has been very interesting. In this week we mostly studied about network and communication. In class we have studied about many things.
Computer Network
Also known as unguided
medium.
In a peer-to-peer
network, all computers are considered equal. Each computer controls its own
information and is capable of functioning as either a client or a server
depending upon the requirement. Peer-to-peer networks are inexpensive and easy
to install. They are popular as home networks and for use in small companies. And we studied a bit about server networks and I think this week's learning was very interesting and full of new information, I've learnt many useful things and I think those will be useful in my future life and career.
Computer Network
It is simply a group
of interconnected computers.
Two or more computers
are connected via hardware or software, and able to communicate with each
other.
Example of a computer
network:
the Internet, ATM,
school network, e-banking, home network, etc
And our lecturer gave us some explanation about why to use networks. We use network to share recourse , information and collaboration and promote communication. And there are 5 major network components:
1.Communication Media
2.Interconnecting
Devices
3.Computers
4.Networking Software
5.Applications
We have learnt about signals too, there 2 types of signals Analog signal and Digital signal
- Digital signal – carries discrete data between computer devices. The signals represent a pattern of bits.
- Analog signal – also known as radio signal. It is the signals transmitted along conventional telephone lines.In another lecture we continued studying about network. Mostly we studied about communication channel, wireless media and medium, physical media and medium and digital communication.
Communication Channel
Some type of link
through which the data can be transmitted or transferred from one computer to
another.
To send data through
the channel requires some type of transmission media,
which may be either physical or wireless.
Wireless Media
Also known as unguided
medium.
Microwave system –
transmits data via high-frequency radio signals through the atmosphere
Satellite system –
receive transmitted signals, amplify them, and then transmit the signals to the
appropriate locations
Cellular technology –
uses antennae resembling telephone towers to pick up radio signals within a
specific area (cell)
Infrared technology –
transmits data as infrared light waves from one device to another, providing
wireless links between PCs and peripherals
Physical Media
Twisted-pair cable –
consists of two independently insulated wires twisted around each other (least
expensive type of cable—the kind that is used in many telephone systems)
Coaxial cable –
consists of an insulated center wire grounded by a shield of braided wire (the
primary type of cabling used by the cable television industry; it is more expensive than twisted pair)
Fiber-optic cable –
contains hundreds of clear fiberglass or plastic fibers (threads) (made from
thin, flexible glass tubing; bandwidth is greater, so it can carry more data;
it is lighter than metal wires and is less susceptible to interference; it is
fragile and expensive)
ISDN line – a special
digital telephone line that transmits and receives information at very high
speeds
Digital Communication
Communication has
changed radically in today’s digital age and our lifestyle.
Today, we are talking
about digital communication, digital entertainment, digital mobility and so
forth.
It’s already happening
accessing home computer from our cell phone. This is the era of digital
telephony.
In the next class we mostly studied about peer to peer network.
Peer-to-Peer Networking
Peers with no
centralized control over shared resources
Can share resources
with any other computer on network
No computer has higher
access priority
No computer has more
responsibility to provide or shared resources
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