Network Protocols

DHCP (Dynamic Host Configuration Protocol)

  • Simplifies IP address management
  • Administrators don’t need to manually assign IP addresses to each client in the network

Reference: Oracle DHCP Documentation

Middleware

RPC (Remote Procedure Call)

  • REST: Representational State Transfer
  • SOAP: Simple Object Access Protocol

Web Server

Virtual Host

  • One computer hosting multiple domains
  • Implementation methods:
    • Specify host name and domain name in URI
    • Specify host header field

Proxy Types

  • Cache Proxy: Uses cached responses
  • Transparent Proxy: No changes, just redirects requests

WebSocket

Use Case

When a server needs to push values to a browser.

Example: In Jira, when a value is changed elsewhere, the Jira page open in the browser automatically refreshes.

STOMP over WebSocket

  • STOMP: Simple Text Oriented Messaging Protocol
  • Provides a frame-based protocol on top of WebSocket

Mesh Network

Features

  • Censorship resistant: No central control point
  • Decentralized: Civilian network
  • Ubiquitous: Essential for home networking

How it Differs

Traditional networks require a central system for communication, but mesh networks allow direct communication between devices.

Network Speed Check

Tools

Use webpagetest.org to check which layer is causing slow performance.

This tool helps identify:

  • DNS lookup time
  • Connection time
  • Time to first byte
  • Content download time