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Introduction

Preliminaries

• Up to three slots of content per week
• 25% Coursework Announced Next Week (2 courseworks ???)
• 50% exam
• 20 lectures

Outline

• Intro (2 lectures)
• Network types (2 lectures)
• Standards (8 lectures)
• Applications (4 lectures)
• Security (3 lectures)
• Network Modeling (1 Lecture)

Advice

• Do work outside of lectures
• Read RFCs
  • Example: Telnet
  • Example: Coffe Pot Protocol (April Fools)
• Play with network stuff
• Contact Phillip
  • ReineckeP@cardiff.ac.uk
  • WX/3.10

Actual material

Keywords

Keyword	Definition
Network	Computers connected so they can communicate with eachother
Protocol	Set of rules for communication between entities

Content

• You can send a request to a website using the telnet command, the website will return plaintext information
• This is because HTTP is a plaintext protocol
• Wireshark is used to visualise network traffic
• What is a network?
  • Computers connected so they can communicate with eachother

Layers

• Decomposition - One protocol per layer
• Abstraction - Interfaces between layers
• Reusability - re-use protocols

  visual aids help learning (anki approved) did you just draw this? Yup. Using my laptop

OSI 7 layer stack: - **P**lease **D**o **N**ot **T**hrow **S**ausage **P**izza **A**way - Physical - Physical Connections and bit stream, cables, wireless transmission etc. - Data Link - Aggregates stream of bits into a frame - Network - Routing and flow control of packets - Transport - Splits/joins messages into packets for sending over lower layers. Also handles packet loss and out of order delivery - Session - Maintains connection between processes - Presentation - Perty format - Application - The appplication that the user sees

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