Download 2. Internet Communication Diagram

Proxy server – This is a server that all
computers on the local network have to
go through before accessing
information on the Internet. By using a
proxy server you can filter what users
connected to the network can access –
it is also help speed up browsing by
caching site data
I want to access
the Internet or
send an email
To preview web pages and
communicate safely on the net you
will need the following software:
Web browser to display the pages
such as - Explorer, Safari, Firefox etc..
Email software to send and receive
emails such as Outlook or Live mail
etc..
Anti virus software to check for
viruses and prevent them running or
installing on your pc
Modem – this decodes the binary
data from the Internet so that the
pc can display the page in graphical
format
Router – this sends the data to the
correct pc by reading the IP address.
There is also generally a built in
Firewall to prevent unauthorised
access to your machine – this is via
secure password which needs to be
entered on installation
Mail server – this is the server which
connects to the email service and then
routes the mail to the correct user –
like a digital postman. Mail is stored,
accessed and sent through this server
– virus checks can be done at this
point before reaching the recipient
TCP/IP when a request is sent out to
the Internet – the TCP/IP protocol
breaks down and packets this
request into smaller chunks. This
protocol will assign an IP address to
the request and also direct it to the
correct IP address of the server
which holds the information.
ISP – this is a company/service that
controls your internet access – this
will include the speed of the service
and the infrastructure to enable the
communications. Eg: Talktalk, BT,
Plusnet etc.. They may also act as a
mail server for your emails.
When a link is clicked or a web
address typed into a browser – the
TCP/IP deals with the request.
Pop – point of presence
Place where your ISP hardware
enables transfer of data
TCP – this packets up the request of a
page into smaller chunks to be sent
over the Internet or reassembles the
page from the web server once
received.
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fl;kasjdf ;lkajdsfsl kjdalks
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Any site
IP – This is a unique number assigned
to your router and other routers
around the world. Web address URL’s
are really IP addresses used to find
the correct site or person. Eg:
(www.somesite.com) could be
192.168.1.68
Web servers know where to send the
page to when requested. Your router
attaches your IP address to your
request for a page (when a link is
clicked on the search page of Google
for example) and also sends the
request to the correct server via the
sites IP address
NAP - Network access point
Allows ISP’s to communicate
& send data between each other