1. Network Diagram with International Standard
The connectivity Between Internet, WAN, LAN, Intranet, Server and Datacenter

2. The Connectivity Between The Internet and The System.
Internet/Cloud
Router
Firewall
VPN
Wi-Fi Router
WAN Switch
DMZ Zone(All Server)
DMZ Zone(Data center)
LAN 2 Switch
LAN 1 Switch
LAN 1 connecting Switch
LAN 2 connecting Switch
User PC
User PC

3. The Definition and Declaration of the Connectivity
Connecting with Internet/cloud and router.
The Internet is a global network connecting millions of computers. More than 100 countries are linked into exchanges of data, news and opinions.
A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP's network. Routers are located at gateways, the places where two or more networks connect.
A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks.
Internet/Cloud
Router
Firewall

4. The Connection between Internet, Router and Firewall.
The Connection Between the Router and The Internet and Firewall in details.
Internet/Cloud
Router
Firewall
Link Load Balance
Wan Route
LAN Route or NAT
Bandwidth Manage
Spam, Web Filter and DDOS Attack
Intrusion Prevention System
LAN Protection
Wan Protection
BTCL Bandwidth
Any other ISP Bandwidth

5. The Connection Between Firewall and Server.
Demilitarized zone (DMZ)
Application Server
Database Server
Mail Server
AD,DNS, Anti Virus,IIS Server
Data Center
DMZ: In computer networks, a DMZ (demilitarized zone) is a computer host or small network inserted as a "neutral zone" between a company's private network and the outside public network. It prevents outside users from getting direct access to a server that has company data.

6. The Connection Between The Firewall and VPN
VPN: A Virtual Private Network (VPN) is a network technology that creates a secure network connection over a public network such as the Internet or a private network

7. The Connection Between The Firewall and Switch
LAN 1 Switch
LAN 2 Switch
Switch: In networks, a device that filters and forwards packets between LAN segments. Switches operate at the data link layer (layer 2).

8. The Connection Between The LAN Switch and User
Hub
Wi-Fi Router
Switch
Hub
Wi-Fi Router
User PC
User PC
User PC
User PC
User PC
User PC
Hub: A common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN.
Wi-Fi Router: A wireless router is a device that performs the functions of a router but also includes the functions of a wireless access point.
Network Cable: Networking cables are used to connect one network device to other network devices
RJ-45 Connector: RJ45 is a standard type of connector for network cables such as those used in Ethernet networks.

9. Conclusion
In This Presentation we describe about a standard international network diagram. Where we discussed briefly how the network work with internet/intranet, router, firewall, server, switch, hub and end user. If we flow this diagram, we hope that any computer network will run smoothly.
Thanks’ for your valuable time to see this presentation.
Mehedi Hassan
System Administrator