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 ID: 458550
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Slide1
Internet Service Providers (ISP)
How Internet service providers workSlide2
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.'Slide3
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.Slide4
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’
21.34.129.86
28.203.156.94
Packet of data’Slide5
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
Router
CSU / DSU
CSU / DSU
‘Another Computer’
LAN
21.34.129.86
28.203.156.94Slide6
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)Slide7
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 LineSlide8
Internet Backbone
Internet Service Providers (ISP)
‘Business Network’
The data packets (datagrams) are then sent at
high speed
across the Internet backbone.
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 BackboneSlide9
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
NAP
NAP
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 BackboneSlide10
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
NAP
NAP
NAP
MAE
Internet BackboneSlide11
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
www.bbc.co.uk
(or you can perform the following request online:
http://traceroute-online.com
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