3_5_2 Understand Network Protocols

You should be able to:

Define the term ‘network protocol’
Explain the purpose and use of common network protocols including:

•• Ethernet

•• Wi-Fi

•• TCP (Transmission Control Protocol)

•• UDP (User Datagram Protocol)

•• IP (Internet Protocol)

•• HTTP (Hypertext Transfer Protocol)

•• HTTPS (Hypertext Transfer Protocol Secure)

•• FTP (File Transfer Protocol)

•• email protocols:

•• SMTP (Simple Mail Transfer Protocol)

•• IMAP (Internet Message Access Protocol)

REVISE:

What is a network protocol?

A set of agreed rules that are used for communication across a network.

Ethernet (Purpose and Use)

Ethernet is the rules applied to PHYSICAL parts of a network.

The most common physical rule is the "Ethernet Cable". The Ethernet protocol states that the cable must be twisted pair copper cable.

Wi-Fi (Purpose and Use)

A Wi-Fi protocol is the rules for a wireless LAN or W-LAN. Wireless devices must meet the standard in order to connect.

IP (Purpose and Use)

Internet Protocol

The rules for sending data packets across a network and the Internet. The data packets are sent using an address called an IP address.

TCP (Purpose and Use)

Transmission Control Protocol

Often linked with the Internet Protocol and referred to as TCP/IP, TCP creates the link between the two hosts where data sharing is taking place. TCP makes sure that the connection and data exchange takes places and reconnects if there is an error.

UDP (Purpose and Use)

User Datagram Protocol

This is another protocol that can be used to connect hosts but it doesn't do the error checking that TCP does so it make it faster but less reliable.

HTTP (Purpose and Use)

Hypertext Transfer Protocol

This is the set of rules used for connecting a web page from a server to a client.

HTTPS (Purpose and Use)

Hypertext Transfer Protocol Secure

This is a set of rules used for SECURELY connecting a web page from a server to a client.

FTP (Purpose and Use)

File Transfer Protocol

FTP is a protocol for sending files across a network.

Email Protocols - SMTP & IMAP (Purpose and Use)

SMTP - Simple Mail Transfer Protocol

SMTP is for sending emails from the mail server directly to the clients computer. The email is then removed from the server and remains on the clients computer.

IMAP - Internet Message Access Protocol

IMAP sends a copy of an email to the client but the email remains on the server. An example of this would be GMAIL or YAHOO mail.

TEST:

Download and print the test paper here: https://drive.google.com/open?id=0B5fLtQ0Xgr2PTk5QYnJwOHd5dVk
Try the mock test yourself.
Use the 3.5.2 Walking Talking Mock below to guide you through answering the questions.

SOURCE RECOGNITION - PLEASE NOTE: The examination examples used in these walking talking mocks are samples from AQA from their non-confidential section of the public site. They also contain questions designed by TeachIT for AQA as part of the publicly available lesson materials.

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