How to check system information in computer with windows os

We need to check the system information when we buy new computers or old computers.

 To check the system

1. Press Windows + R key together.

2. Type dxdiag or msinfo32 in the run box and click ok.

Then you will see the system information about the computer.

LAN and WAN

LAN (Local Area Network)

LAN is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building and has its network equipment and interconnects locally managed.

WAN (Wide Area Network)

WAN is the network that is interconnected by two or more LANs. WAN is not only defined by a larger geographic distance, but also generally defined by leased telecommunication circuits.

Sample Network Diagram for Small Office

Access Point

Normally, the access points allow the users to connect the Internet through the Wired Network(Switch, Router, Modem, etc....).

Switches

The switch (layer 2) normally receive the packets, process it and forward data to the destination.

Routers

Normally, the router is used to connect the different networks. But there are so many router functions if detailed.

Modem

The Modem is the common networking device that turns the digital data of an electronic device into modulated electrical signal for transmission over telephone lines and demodulated by another modem at the receiver side to recover the digital data.

Internet

The Internet is the global system of interconnected computer networks that use the Internet Protocol Suite (TCP/IP) to link billions of devices worldwide.

VPN (Virtual Private Network)

I want to explain about VPN because some of my friends are confusing about VPN.

The big companies use VPN to get secured network connection to connect offices, industries, etc... from different locations through the Internet. (for example, most of the banks use VPN).

Generally, there are two types of VPN.(More than two if detailed)

1. Side-to-Side VPN.

2. Remote Access VPN.