Computer Networks · Week 1–2
Ethernet frames, MAC addresses, ARP in action
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Computer Networks • Week 1–2
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Ethernet frames, MAC addresses, ARP in action

Ethernet provides local-link delivery. Hosts and switches use MAC addresses so frames can reach the correct interface on the current LAN segment. ARP bridges a semantic gap: an application or IP layer may know an IPv4 destination, while the local link still needs a destination MAC address.

StackShade deck
COURSE CONTENTS

Ethernet frames, MAC addresses, ARP in action

01How the Internet Works + OSI ModelWeek 1 · 4 topics0/4
OSI Model Explained — interactive deep dive15 minOSI Layer Explorer + Encapsulation Simulator15 minWhat happens when you type google.com12 minTCP handshake + OSI vs TCP/IP + practice quiz15 min
02Physical & Data Link LayersWeek 1–2 · 5 topics0/5
Signals, bandwidth, latency, copper vs fiber vs radio12 minEthernet frames, MAC addresses, ARP in action14 minInteractive: ARP resolution walkthrough10 minSwitches, VLANs, and why hubs died12 minTrace a frame across 2 switches (worksheet)20 min
03Network Layer: IP & RoutingWeek 2–3 · 6 topics0/6
IPv4 anatomy: network vs host bits, CIDR15 minInteractive: subnet calculator playground15 minRouting tables, default gateway, longest-prefix match12 minNAT, private ranges, and why IPv6 exists12 minHow routers learn: static, RIP, OSPF, BGP (bird's-eye)14 minSubnet 3 networks + design a small topology30 min
04Transport Layer: TCP & UDPWeek 3–4 · 5 topics0/5
TCP deep dive: handshake, sequence numbers, ACKs, retransmission16 minAnimated 3-way handshake + teardown10 minFlow control (rwnd) vs congestion control (cwnd, slow start)14 minUDP & QUIC: why HTTP/3 ditched TCP12 minAnalyze a TCP stream in a packet capture25 min
05Application Layer: HTTP, DNS & FriendsWeek 4–5 · 6 topics0/6
DNS end-to-end: resolver → root → TLD → authoritative14 minInteractive: DNS lookup journey10 minHTTP/1.1 vs 2 vs 3: multiplexing, streams, QUIC14 minTLS handshake, certificates & the chain of trust14 minWebSockets, SMTP/IMAP, DHCP essentials12 minInspect real requests in browser DevTools20 min
06Security & Troubleshooting ToolkitWeek 5 · 5 topics0/5
Firewalls, VPNs, proxies: what each one really filters12 minCommon attacks: SYN flood, DNS spoofing, MITM (defense view)14 minInteractive: layer-by-layer troubleshooting scenarios15 minHands-on: ping, traceroute, dig, curl, netstat30 minWireshark: follow one full HTTP conversation30 min