This key facts covers Layer 3: Transport Layer within TCP/IP Layers for GCSE Computer Science. Revise TCP/IP Layers in Networks for GCSE Computer Science with 15 exam-style questions and 18 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 4 of 10 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 4 of 10
Practice
15 questions
Recall
18 flashcards
Layer 3: Transport Layer
What happens here: Ensures reliable data delivery between applications using TCP or UDP.
- Purpose: Reliable end-to-end communication and error checking
- Protocols: TCP (Transmission Control Protocol), UDP (User Datagram Protocol)
- TCP: Reliable - checks data arrived correctly, resends if lost
- UDP: Fast but unreliable - no error checking (used for streaming, gaming)
- Port numbers: Identifies which application to deliver data to (HTTP=80, HTTPS=443)
- Data format: Segments (TCP) or Datagrams (UDP)