Separate names, addresses and local assignments
See this course’s project requirements
A labeled network model, packet journey, transport comparison, transfer calculation and evidence-based failure explanations.
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What to include
- Labeled two-subnet network model.
- Name/address/gateway explanation.
- Packet and hop-limit trace.
- Transport comparison and unit-checked delay calculation.
- Two failure-card interpretations with limits.
Review and revise
Use these criteria to check your work and choose what to improve.
- Device roles and paths are correct.
- Addresses and prefixes are used consistently.
- Calculations use stated units and assumptions.
- Evidence supports the conclusions without live-system claims.
Want more background?
The idea in everyday life
Follow a fictional library request through two small networks using supplied evidence only.
A name lookup supplies an address; routing then decides how to reach that address.
Separate names, addresses and local assignments — guided practice
Explain DNS, IP addresses and the default gateway as different information.
Use network-notes.md or paper. All addresses and outputs are fictional. Room A has laptop A at 192.0.2.10/24, printer P at 192.0.2.20/24 and a switch. Router R has A-side 192.0.2.1/24 and B-side 198.51.100.1/24. Room B has server S at 198.51.100.20/24 and its switch. A uses default gateway 192.0.2.1. A supplied DNS record maps catalog.example to 198.51.100.20. For this /24 exercise, matching first three octets means same subnet. No live network access, capture, scanning or device configuration is needed.
1. Read the DNS card
Write catalog.example -> 198.51.100.20.
You should see: The name maps to S’s address.
A readable name and an IP address serve different roles.
2. Read the device card
Record A’s IP, /24 prefix and gateway.
You should see: A=192.0.2.10; gateway=192.0.2.1.
A device address identifies itself; the gateway identifies its next router.
3. Classify a new destination
Compare 192.0.2.99 with A using the stated /24 rule.
You should see: It is local because the first three octets match.
This exercise uses a specified prefix rather than a guess from the address.
4. Describe assignment
Write that DHCP can supply configuration such as an IP address; DNS resolves names.
You should see: Assignment and lookup are distinguished.
A successful lookup is not a guarantee of service availability.
What to finish
An address/name/gateway glossary applied to the supplied cards.
Watch for this
Assuming the /24 comparison shortcut applies to every possible prefix.
How can I tell I understand it?
Complete the changed case, explain your result, and pass the three application checks.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
Go to the knowledge checkOptional course overview video · same video as Lesson 1
Computer Networks: Crash Course Computer Science #28
From CrashCourse. Watch here or open it on YouTube .
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Source & access notes · checked 2026-09-12
Opened and inspected on 2026-09-12: Interfaces and IP delivery.
Access: Free public web page; no paid enrollment required.
Reuse: Same textbook terms; independent exercises only.
Source & access notes · checked 2026-09-12
Opened and inspected on 2026-09-12: DNS, ARP and DHCP roles.
Access: Free public web page; no paid enrollment required.
Reuse: Same textbook terms; independent exercises only.
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