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Level 4 Diploma in Cyber Security

Protocols at each layer: HTTP, email, DNS, TCP and UDP, Ethernet and MAC addresses

CYB405 · Computer Networks — Week 3 of 16

CourseCYB405
Week3 of 16
SemesterII
TutorOnline in the course chat

This week’s topics

Protocols at each layer: HTTP, email, DNS, TCP and UDP, Ethernet and MAC addresses

  1. Protocols at each layer: SMTP, POP3, IMAP4 and HTTP
  2. TCP vs. UDP
  3. IP
  4. Ethernet, ARP and MAC addresses

What you will be able to do

  • 1.2 Explain how different TCP/IP network protocols enable communication across devices and networks.
  • 1.3 Analyse protocols and protocol suites.

Activity

Start with this week’s 4 videos, then: Seminar, guided reading and a short written task: explain how different TCP/IP network protocols enable communication across devices and networks.

Study materials

Videos

  • How data travels across the internet · Oak National Academy, Key Stage 4 (GCSE level) · for registered students
  • How a DNS Server (Domain Name System) works. · YouTube · PowerCert Animated Videos · 6 min · for registered students
  • How DNS Works - Computerphile · YouTube · Computerphile · 8 min · for registered students
  • The World Wide Web: Crash Course Computer Science #30 · YouTube · CrashCourse · 12 min · for registered students

Further resources

  • Computer Networking: Principles, Protocols and Practice: Electronic mail · PDF · Bonaventure, Computer Networking: Principles, Protocols and Practice (2021), Part 2 section on e-mail and SMTP (HTTP follows on p. 144), pp. 134–143 · for registered students
  • Kurose & Ross Wireshark lab: HTTP · PDF · Kurose & Ross Wireshark lab (v9.0), hands-on lab: capture HTTP requests and responses between browser and server · for registered students
  • An Introduction to Computer Networks, 1.10–1.12: IP, DNS and transport · PDF · Dordal, An Introduction to Computer Networks, release 2.0.11, 1.10–1.12: IP, DNS, TCP and UDP (a step up), pp. 24–34 · for registered students
  • An Introduction to Computer Networks, 2.1: Ethernet and MAC addresses · PDF · Dordal, An Introduction to Computer Networks, release 2.0.11, 2.1 to 2.1.4 on Ethernet, network cards and the structure of MAC addresses (a step up), pp. 47–53 · for registered students
  • Development of the Domain Name System · Open-access article · Mockapetris & Dunlap (1988), ACM SIGCOMM '88. The designers explain how and why the Domain Name System was built. · for registered students
Materials marked “for registered students” open in the student portal, which is set up as soon as you receive final acceptance.
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Course plan
  • Week 1: Network models: the OSI and TCP/IP models compared
  • Week 2: Protocols and protocol suites
  • Week 3: Protocols at each layer: HTTP, email, DNS, TCP and UDP, Eth…
  • Week 4: The Internet Protocol: IP addresses, subnets, IPv4 and IPv6
  • Week 5: Networking hardware: routers, switches and gateways; cablin…
  • Week 6: Securing network communication: firewalls, encryption and s…
  • Week 7: Wireless and mobile networks: from 2G to 5G, Wi-Fi, RFID an…
  • Midterm: Midterm evaluation
  • Week 9: Network topologies: bus, star, ring and mesh; use cases, re…
  • Week 10: Designing addressing schemes: IP allocation, subnetting, st…
  • Week 11: Network design project: selecting routers, switches, access…
  • Week 12: Applying Computer Networks in practice: case studies
  • Week 13: Assignment workshop: research, planning and referencing
  • Week 14: Assignment workshop: drafting, feedback and improvement
  • Week 15: Review and coursework completion
  • Final: Final assessment and submission
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