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Computers & Digital Literacy · Grade 9

Networks and the Internet

Learners follow a request from Cedar Valley High to a library catalog server and back: across independently run networks joined by open standards, hop by hop through routing tables that adapt when a link fails, using IPv4 and IPv6 addresses, after a DNS lookup that climbs from resolver to root to top-level domain to authoritative server, and finally as TCP or UDP traffic carrying HTTP requests and responses. Along the way they separate the web from the internet it runs on.

  • 4 lessons
  • About 120 minutes
  • Check what you learned: 10 questions
  • Ways to answer: fill in the blanks, choose an answer, trace code, match pairs, type a number and put in order
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What learners will discover

  • Describe the internet as interconnected, independently run networks joined by open standards, and trace hop-by-hop routing, including rerouting around a failed link.
  • Compare IPv4 and IPv6 addresses (32 and 128 bits, notation, size of the address space) and explain private addressing and the move to IPv6.
  • Sequence a DNS resolution from resolver to root, top-level domain and authoritative server, and use time-to-live values to reason about caching.
  • Choose TCP or UDP for an application, interpret HTTP requests, responses and status codes, and distinguish the web from the internet.

Lessons

  1. A network of networks 8 steps4 practiceabout 28 min
  2. Addresses: IPv4 and IPv6 7 steps5 practiceabout 26 min
  3. DNS: from name to address 6 steps4 practiceabout 26 min
  4. TCP, UDP, HTTP and the web 7 steps4 practiceabout 28 min
  5. Check what you learned 10 questions at the end

Keep exploring

More 9th grade computer skills

Guide for grown-ups