Welcome to my First Blog!
Hello Readers!
As I have started my career from this domain, so just wished to share the knowledge for understanding on basics of this domain. Hope it will help everyone to learn the domain. I have tried to keep all the relevant information in this entire blog. Please go to each post and read them. If you have any suggestions and comments on any section, please provide your valuable feedback or suggestion for improvement.
Secondly this blog can be helpful for anyone who wanted to start a career in network domain, IT domain, Cyber security and Information Security domain. Because all the content were intended to cover those areas only.
Lets start;
A Basic Computer Network
A computer network is a group of computers connected together
through wired or wireless medium.
A basic network allows devices to share information or communicate with each other.
How they communicate ?
Language: Binary i.e. 0 and 1
Interface: Physical (Ports) / Wireless
Medium: Cable / Wifi / Bluetooth / RF
Computers are generally connected from their Ethernet Port (RJ45 Interface/ Network Interface Card) via ethernet cable (UTP Cat cable/ Patch cord) to a LAN port (RJ45 interface) designated at table/wall or direct at Switch device port.
In case of wireless connectivity they are connected through wireless NIC card.
Basically there are three types of a computer network.
LAN: Local Area Network
MAN: Metropolitan Area Network
WAN: Wide Area Network
There are networks in other way as;
WLAN: Wireless Local Area Network
SAN: Storage Area Network
We will cover each sections in our coming next blogs.
A computer network is used for following tasks to be performed.
- File Sharing and
Transfer
- Browsing
Internet and other stuffs.
- Allow user to
access information.
There are different designs of connectivity used such as;
Peer to peer and Client/ Server
Peer to peer means one to one connectivity. Such as Switch to PC.
Client Server architecture means there is a primary server to which one or multiple PC can be connected through LAN or WAN. For example centralized Database Management Server, One Web application Server, etc.
Topology:
The term Network Topology is the logical arrangement of computer networking devices to the way in which the various nodes or hosts or computers of a network are linked together.
So, multiple devices connected with each other physically and logically with each other in various ways as mentioned below;
- Mesh Topology
- Star Topology
- Bus Topology
- Ring Topology
- Tree Topology
- Hybrid Topology
To know how the network works or behaves, a topology is must required. There are many commercial software available in the market, who represent the network architecture or topology in graphical interface or dashboard for easy identification.
There are many available tools and software for simulation of network such as Cisco Packet Tracer. It allows students and teachers to design, build, configure, and troubleshoot complex networks using virtual equipment.
Network Interface Card (NIC)/ LAN Card
A NIC (network interface card/ Network interface controller) is designed to connect over a computer
network through Ethernet cable or wireless (In case of WNIC). A NIC card can transmit signals at the physical layer and deliver data
packets at the network layer, it acts as a middleman between a computer/server and
a data network.
Internet
Internet, a system architecture that has modernized communications and methods of information exchange by allowing various computer networks around the world to interconnect. Sometimes known as a “network of networks”.
It was first created by the Advanced Research Projects Agency (ARPA) of the U.S. Department of Defense. ARPANET was one of the first general-purpose computer networks. It connected time-sharing computers at government-supported research sites, largely universities in United States using packet switching. Then it became a critical section of infrastructure for the computer science research community in the United States.
Bandwidth:
Bandwidth is calculated as the amount of data that can be transferred from one point to another within a network in a definite amount of time. It is expressed as a bitrate and measured in bits per second (bps). Similarly in today’s technology we are more familiar with higher values which are measured as Kbps, Mbps, Gbps, etc,.
The more bandwidth, the more data can be communicated or transferred.
So this is just a basic and first writeup. Will update and come with new information in my next posts. Stay tuned.
Thanks!
-DR
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