CS Project

CS Project

Published on 25 June 2021
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Transcript
00:00
Network infrastructure
00:03
The first part of the network infrastructure is the internet service provider (ISP)
00:09
ISPs are companies that provides the user with access to the internet. It is the gateway to the internet and everything that a user does online.
00:22
The second part to the network infrastructure is the router
00:27
The router is the piece of network hardware that allows communication between your local home network
00:36
A router is a switching device for networks, which is able to route network packets, based on their addresses, to other networks or devices.
00:42
Their main job is to forward packets based upon a routing table.
00:47
When doing so, they also provide: -traffic segmentation -multiple broadcast domains, -define network layer -addressing subnets and networks
00:55
The third part in the network infrastructure is the Public Switched Telephone Network (PSTN).
01:03
A PSTN is a combination of telephone networks used worldwide, including telephone lines, fiber optic cables, switching centres, cellular networks, satellites and cable systems.
01:11
These networks provide the infrastructure and the services for public telecommunication such as letting users make landline telephone calls to one another.
01:20
The last part of the network infrastructure is the cellular network
01:26
A cellular network is used by the mobile phone operator to achieve both coverage and capacity for their subscribers.
01:33
Large geographic areas are split into smaller cells to avoid line-of-sight signal loss and to support a large number of active phones in that area.
01:44
All of the cell sites are connected to telephone exchanges (or switches), which in turn connect to the public telephone network.