3534231
Communication and Internet Technology
- Hardware
- Server side
scripting
- Uses PHP
- Happens at the server side
- Uses a software called Apache
- Why use server side scripting?
- More security
- Better performance
- More security
- PHP is executed on the server, the codes
are not sent to the user, only its results
are
- Happens at the server side
- Uses PHP
- Client Side Scripting
- Happens at the client side (browser)
- Browser looks at the tags and
fetch the images, videos,
javascripts...
- Browser looks at the tags and
fetch the images, videos,
javascripts...
- Uses Javascript
- Happens at the client side (browser)
- Communicaiton Types
- Parallel
- Uses more than one
communication line at a time to
transmit more than one bit of
information at a tiem
- Example: Buses in the computer that
connect to the motherboard
- Uses more than one
communication line at a time to
transmit more than one bit of
information at a tiem
- Serial
- Communcation that uses only one
transmission line to send one bit of
information at a time
- Example: Peripheral computer devices
such as mouse,keyboards etc.
- Example: Peripheral computer devices
such as mouse,keyboards etc.
- Communcation that uses only one
transmission line to send one bit of
information at a time
- Simplex
- Half duplex and full duplex
- Client-Server Model
- Thin Client Server Model
- Thick Client
Server Model
- Thin Client Server Model
- Synchronous
- Asynchronous
- Asynchronous transmission is when the two
computers' clocks are not synced together
- start bits and stop bits will need to be sent in
order for the two computers to communicate
- start bits and stop bits will need to be sent in
order for the two computers to communicate
- Asynchronous transmission is when the two
computers' clocks are not synced together
- Communication when both
computers' system clock are in
time with each other and
information can be sent
immdiately with real time
response
- Asynchronous
- Parallel
- Web RequestLife Cycle
- 5 layers Internet Suite Stack
- Application
- Transport
- Network
- Data Link
- Physical
- Physical
- Reroutes the data to its destination
- Data Link
- Transport layer converts the URL into IP address
using a DNS and passes this on to the next layer
- Network
- Browser sends the URL off to the Transport layer
- Transport
- Application
- 5 layers Internet Suite Stack
- IP Addressing
- Public
- Static
- Normally assigned
to web hosts or
servers
- Does not change
- Normally assigned
to web hosts or
servers
- Dynamic
- Users/Clients only
- Changes whenever a user
disconnects and reconnects
- Users/Clients only
- Static
- Private IP
- Used in LANs, always Static
- Used in LANs, always Static
- Public
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