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How Data Travels

Eighth graders trace how a message crosses the internet. It is split into packets, each addressed with IP, routed by routers, and reassembled at a server or device — all following shared protocols. They explore each piece, then map a message’s journey.

Grade 8How Data Travels50 minutes1 class periodCSTA / ISTEExplicit teaching4 StandardsCSTA
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Explain packets.
  • ✓Describe IP, routers & servers.
  • ✓See why protocols matter.
  • ✓Map a message’s path.
Essential Question

How does a message travel across the internet?

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Explore · Interactive

The Network Explorer

Project this and tap each. Have students explore how data moves on a network.

🌐 Explore how data travels — tap eachTry it

The Lesson · Use → Modify → Create (a coding progression with Unplugged practice)

50 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Hook — From Here to There

6 min

How does a message get from your phone to a friend across the world?

👩‍🏫 Teacher Moves

  • Show a message sending.
  • Ask what happens in between.
  • Set the goal.

🎒 Student Actions

  • Think.
  • Guess.
  • Get ready.
2

Use — How Data Travels

12 min

Students use the idea.

👩‍🏫 Teacher Moves

  • Send students to the Network Explorer.
  • Tap each part.
  • Note packet, IP, router, server.

🎒 Student Actions

  • Tap each.
  • Say.
  • Note it.
3

Modify — Re-route It

13 min

Students modify.

👩‍🏫 Teacher Moves

  • Block one path; find another route.
  • Lose a packet; resend it.
  • Reassemble the message.

🎒 Student Actions

  • Re-route.
  • Resend.
  • Rebuild.
4

Create — Map a Journey

13 min

Students create.

👩‍🏫 Teacher Moves

  • Draw a message from device to server.
  • Label packets, IP, routers.
  • Show the return trip.

🎒 Student Actions

  • Draw.
  • Label.
  • Show.
5

Reflect — Reflect

6 min

Students close.

👩‍🏫 Teacher Moves

  • Say what a packet is.
  • Say what a router does.
  • Complete the exit ticket.

🎒 Student Actions

  • Say it.
  • Say.
  • Complete the exit ticket.
Standards Alignment

Built to the standards you report on

Aligned to the CSTA K-12 Computer Science Standards and the ISTE Standards for Students.

CSTA
2-NI-04

Model how data is sent in packets, routed & reassembled.

CSTA
2-NI-05

Explain how security measures protect data.

CSTA
2-CS-03

Systematically identify and fix connection problems.

ISTE
5 Computational Thinker

Model systems to understand them.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Use a mail-delivery analogy.
  • Act out packet routing.
  • Label a network map.

Support & Access

IEP / 504
  • Start with packet & server.
  • One part at a time.
  • Use pictures.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Explain TCP vs UDP simply.
  • Trace a traceroute.
  • Discuss latency.
Materials

What to gather

  • 📽️Screen / board
  • 🌐Network map
  • 💻The Network Explorer
  • 📨Packet cards
  • 📓Notebooks
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

networkconnected devices that share datapacketa small piece of a split-up messageIP addressa device’s address on a networkroutera device that forwards packetsserverstores and sends data to clientsclienta device that requests dataprotocolagreed rules for communicationbandwidthhow much data can move at once
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
What is a packet?
A small piece of a message that travels on its own.
QUESTION 2
What does a router do?
Forwards packets toward their destination.
QUESTION 3
What is a protocol?
Agreed rules that let devices communicate.

Reflect: how data travels.

Have students draw a message’s path across a network. A printable networks worksheet is in the Computer Science library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 CS How Data Travels (Grade 8)Flip
Card 1
Term
Tap to flip →
Meaning
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Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 CS How Data Travels (Grade 8)Quiz
Score: 0
1 / 6
Question 1
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Nice work!

Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ CS How Data Travels (Grade 8)Print
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: bandwidth, client, IP address, network, packet, protocol, router, server
  1. a small piece of a split-up message
  2. a device that requests data
  3. agreed rules for communication
  4. a device’s address on a network
  5. how much data can move at once
  6. stores and sends data to clients
  7. connected devices that share data
  8. a device that forwards packets

Part B · Show what you learned

  1. What is a packet?
  2. What does a router do?
  3. What is a protocol?
Answer key — Part A: 1) packet · 2) client · 3) protocol · 4) IP address · 5) bandwidth · 6) server · 7) network · 8) router
Part B: 1) A small piece of a message that travels on its own. 2) Forwards packets toward their destination. 3) Agreed rules that let devices communicate.