Expert-level computer networks covering OSI model, TCP/IP stack, routing protocols, transport layer, application protocols, network security, and software-defined networking.
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OSI 7 layers: physical, data link, network, transport, session, presentation, application. TCP/IP 4 layers: network access, internet, transport, application. Encapsulation: each layer adds header wrapping data from layer above.
IP addressing: IPv4 32-bit, IPv6 128-bit, CIDR notation, subnetting. Routing: distance vector (RIP, Bellman-Ford), link state (OSPF, Dijkstra), BGP path vector. NAT: network address translation, maps private to public addresses. ARP: maps IP address to MAC address on local network.
TCP: connection-oriented, reliable, ordered, flow control, congestion control. TCP 3-way handshake: SYN, SYN-ACK, ACK. TCP congestion control: slow start, congestion avoidance, fast retransmit, CUBIC. UDP: connectionless, unreliable, low overhead, for latency-sensitive applications. QUIC: UDP-based, 0-RTT, multiplexed streams, used by HTTP/3.
HTTP/1.1: persistent connections, pipelining, text-based. HTTP/2: binary, multiplexed, header compression, server push. HTTP/3: QUIC-based, eliminates head-of-line blocking. DNS: hierarchical, recursive and iterative resolution, TTL, caching. TLS: record protocol, handshake, certificates, symmetric encryption.
Firewalls: stateless packet filter, stateful inspection, application layer gateway. DDoS: volumetric, protocol, application layer attacks, mitigation strategies. VPN: IPSec tunnel mode, SSL/TLS VPN, WireGuard. Zero trust: never trust always verify, microsegmentation, identity-based access.
| Pitfall | Fix |
|---|---|
| Confusing latency and bandwidth | Latency is delay, bandwidth is capacity |
| Ignoring TCP buffers in throughput | Buffer size limits throughput on high-latency links |
| DNS TTL too short or long | Balance freshness vs DNS load |
| Not handling partial TCP reads | Always loop until full message received |
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概要と使いどころ
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。
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日本語の概要は準備中です。原文の説明を表示しています。