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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Network Layer & Routing6

IP addresses and the math of subnetting
IP fragmentation, when a packet is too big for the road
How routers find a path across the internet
Flooding, distance vector, and link state routing compared
DHCP and ICMP: the IP layer's helper protocols
NAT, and why we ran out of IP addresses

Transport Layer5

Application Layer & The Web4

Wireless, Security & Performance3

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Computer Networks

Foundations of Networking4

Physical Layer & Signals3

Data Link Layer6

Network Layer & Routing6

IP addresses and the math of subnetting
IP fragmentation, when a packet is too big for the road
How routers find a path across the internet
Flooding, distance vector, and link state routing compared
DHCP and ICMP: the IP layer's helper protocols
NAT, and why we ran out of IP addresses

Transport Layer5

Application Layer & The Web4

Wireless, Security & Performance3

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DHCP and ICMP: the IP layer's helper protocols

How a device gets its own IP address automatically, and how the network reports problems back using ICMP (the protocol behind ping and traceroute).

8 min readUpdated 2026-09-03computer-networksnetwork-layerdhcpicmppingtraceroute