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Connection Methods & Protocols
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Bandwidth & Transmission Rates
Internet Protocols
Bandwidth is a measure of the maximum capacity of a network.
- Bandwidth = maximum speed
Transmission rate is the actual amount of data that has been transferred across a network in a specified period of time.
- Transmission rate = actual speed
Both are measured in bits per second.
Protocols are a set of rules that manages the communication between different computers on a network.
There are two extremely important protocols that the internet relies on:
- Internet Protocol
- Transmission Protocol
Different uses of the internet use additional protocols, such as the File Transfer Protocol.
The Role of TCP/IP
1. TCP breaks data being transmitted into
packets.
2. IP identifies the address for the packets to be
delivered to & directs them there.
3. TCP reassembles the data and checks for
errors.
4. If errors are found in any packet it gets the
packet resent.
FTP
This protocol controls the transferring of files over a TCP based network.
Normally used for downloading large files as well as to upload webpages to a hosting server.
FTP is an applicaton layer protocol. Others we'll look at in future include POP3 (for email) & HTTP (for web pages).
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Connection Methods & Protocols
Connection Methods
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When connecting to the internet there a number of different methods.
These each have their own pros and cons.
The three main methods are:
- Wireless - such as 4G mobile internet.
- Broadband - wired connection to broadband supplier.
- Dial-Up - runs via telephone lines. Requires a modem.
Wireless
+ You can use this anywhere there is an
access point. Even while on the go.
- It can be less secure as others could access
the network.
- Tends to be slower than wired broadband.
- You need a device capable of wireless & a
wireless access point.
Broadband
+ You get faster speeds than wireless & dial-
up.
+ You get better reception than wireless & dial-
up.
- You are stuck to working at a stationary
computer.
Dial-Up
+ Very widely available as runs off existing
telephone lines.
- Much slower than wireless & broadband.
- Errors can occur during the digital to
analogue conversion.