Internet Service Providers (ISP) HOW INTERNET SERVICE PROVIDERS WORK.

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Presentation transcript:

Internet Service Providers (ISP) HOW INTERNET SERVICE PROVIDERS WORK

What is the role of an (ISP)? Internet Service Providers (ISP) 'An Internet Service Provider (ISP) is a company that provides a user with access to the Internet, usually for a fee.'

Networks Internet Service Providers (ISP) ‘Home’ Local Area Network (LAN) ‘Business Network’ There are small, medium and larger computer networks all needing access to the Internet.

The Internet Internet Service Providers (ISP) ‘Home Computer’ Packets of data are transmitted over the Internet using switched technology guided by the IP address of end computer. The Internet ‘Another Computer’ Packet of data’

Transmitting Data packets Internet Service Providers (ISP) ‘Home Computer’ Here is a more detailed arrangement of how data packets are transmitted across a network. Modem Public Telephone Network Router Modem Pool ISP Port Server Router ISP Backbone Router CSU / DSU ‘Another Computer’ LAN

Internet Service Provider (ISP) Internet Service Providers (ISP) ‘Business Network’ Small and large networks connect to an ISP via a point of presence (POP). ‘Home’ ‘Home Network’ POP Conventional Phone Digital subscriber line Cable Modem Point of Presence (POP) Internet Service Provider (ISP)

Network Access Point (NAP) Internet Service Providers (ISP) ‘Business Network’ The ISP then connects to a Network Access Point via a T3 line (night data speed through put) POP Conventional Phone Digital subscriber line Cable Modem Point of Presence (POP) Internet Service Provider (ISP) ‘Home’ NAP Internet Service Provider (ISP) T1 Line T3 Line

Internet Backbone Internet Service Providers (ISP) ‘Business Network’ POP Conventional Phone Digital subscriber line Cable Modem Point of Presence (POP) Internet Service Provider (ISP) ‘Home’ NAP Internet Service Provider (ISP) T1 Line T3 Line Internet Backbone

Internet Service Providers (ISP) ‘Network Access Points’ This is a simplified diagram of how different networks interface. Metropolitan Exchange (MAE) privately owned Internet Service Providers (ISP) NAP Regional ISP Regional ISP Regional ISP Regional ISP MAE Local ISP Local ISP Local ISP Local ISP Local ISP Local ISP ‘Regional ISP’ ‘Local ISP’ Internet Backbone

Internet Service Providers (ISP) ‘Network Access Points’ A backbone is typically a fibre optic trunk line (OC carrier) that can carry data at high speed. There are many companies that operate their own high capacity trunk lines (NSP), such as: -IBM -UUNet -CerfNet -BBN -SprintNet -PSINet Metropolitan Exchange (MAE) privately owned Internet Service Providers (ISP) NAP MAE Internet Backbone

Following Data Packets Internet Service Providers (ISP) You can follow a datagram through all the different paths taken to end up at the destination IP address. In the windows command prompt tyle in, tracert (or you can perform the following request online: