WEEK 4

yawning

OK. Let's start my blog on week 4. To be honest, I am doing this blog very late. I started well in the beginning  every week I did on time. First, second and third weeks I did on time. However, before doing my week 4, I had some troubles, difficulties, so I couldn't do it on time. Anyway, now I feel myself better and today I continue to do my blog, I hope in the near future I will do my blog on time! To do my activities, assignments and works on time; I have to struggle with my laziness and overcome my desire of sleeping.

In my fourth week of ICT studies, our lecturer explained us the new topic "NETWORK". Actually, before this lesson I already knew about Computer Network. Computer network - means two or more computers are connected through a media link (cables) to exchange information from one computer to another computer. However, during this week I learned more about Network. Previously, I didn't know about: topology, protocol, architecture, LAN and etc...

In first part of week 4, we learned about the Components of the Computer Network, Basic Networking Concepts, Data Communication and Types of Signal. 

In the second part of week 4, we learned more specifically. The main topic was Networking Communication Mediums. Computers share access to common network medium that carries signals from one computer to another. Medium may be physical cable, such as twisted pair, coaxial, or fiber-optic. Medium may also be wireless.

Some cables of Physical Medium

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)

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)

One of the of Wireless Medium 

Satellite System

Receive transmitted signals, amplify them, and then transmit the signals to the appropriate locations.
A satellite navigation or satellite navigation system is a system of satellites that provide autonomous geographical-spatial positioning with global coverage. It allows small electronic receivers to determine their location (longitude, latitude, and altitude) to within a few meters using time signals transmitted along a line-of-sight by radio from satellites. Receivers calculate the precise time as well as position, which can be used as a reference for scientific experiments.

Moreover, in this week I learned the most important part in our topic. Its about the "Types of the Network" 

• Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network)
• Network in a City is call MAN (Metropolitan Area Network)
• Network spread geographically (Country or across Globe) is called WAN (Wide Area Network)

LAN (Local Are Network)

A local area network (LAN) is a computer network that interconnects computers in a limited area such as a home, school, computer laboratory, or office building using network media.The defining characteristics of LAN's  in contrast to wide area networks (WAN's), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines.

MAN (Metropolitan Area Network)

A metropolitan area network (MAN) is a computer network that usually spans a city or a large campus. A MAN usually interconnects a number of local area networks (LAN's) using a high-capacity backbone technology, such as fiber-optical links, and provides up-link services to wide area networks (or WAN) and the Internet.

WAN (WIDE AREA NETWORK)

A Wide Area Network (WAN) is a network that covers a broad area using private or public network transports. Business and government entities utilize WAN's to relay data among employees, clients, buyers, and suppliers from various geographical locations. In essence, this mode of telecommunication allows a business to effectively carry out its daily function regardless of location. The Internet can be considered a WAN as well, and is used by businesses, governments, organizations, and individuals for almost any purpose imaginable.

All in all this week, was very useful for me! I really satisfied with it!