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Computer Science

GCSE · OCR

QuestionsFlashcards

Identifying & Preventing Threats to Computer Systems & Networks
- Forms of Attack on a Network
  8
- Methods of Preventing a Network Attack
  10

Operating Systems & Utility Software
- The Purpose & Functionality of Operating Systems
  7
- The Purpose & Functionality of Utility Software
  6

Ethical, Legal, Cultural & Environmental Impact
- Impacts of Digital Technology on Wider Society
  7
- Legislation in Computer Science
  8

Boolean Logic Diagrams
- Boolean Logic Diagrams
  9
- Combining Boolean Operators
  7

Network Protocols Flashcards

All 9 cards in this deck

What is a (communication) protocol?: A set of rules for how data is turned into packets and transferred between devices on a network.
Why are different protocols used for different purposes on a network?: Each task (e.g. sending email, transferring files, viewing web pages) needs its own agreed set of rules so devices can communicate correctly.
What is the purpose of TCP/IP?: TCP splits data into packets and reassembles/checks them at the destination; IP routes the packets across networks using IP addresses.
What is HTTP used for?: Transferring web pages between a web server and a browser.
What is HTTPS used for?: Transferring web pages securely — the same as HTTP but the data is encrypted, e.g. for banking or passwords.
What is FTP used for?: Transferring (uploading and downloading) files between computers on a network.
What is SMTP used for?: Sending email from a client to a mail server, and between mail servers.
What is POP used for and what is its key feature?: Retrieving email from a mail server; it downloads the email and deletes it from the server.
What is IMAP used for and what is its key feature?: Retrieving email from a mail server; the messages stay on the server so they can be synchronised across several devices.