This is an introduction to computer networks, with an emphasis on practically useful knowledge and on wi-fi technology.
Where possible, it includes references to existing material.
[Work in progress. At the moment, just the outline without links to existing material.]
Outline
- packet switching theory (incl. multiplexing)
- network speeds (gross and net data rate, MBit/s and kbyte/s)
- OSI reference model
- network protocols in general (tasks and examples)
- physical layer protocols (MAC addresses)
- upper layer protocols (examples)
- TCP/IP
- services of the TCP/IP suite, and ideas behind
- IPs in local networks (dynamic / static, internal / external)
- the DNS, DNS updating, BIND9, advantage of DNS in local networks, DDNS
- IPv4, classes of addresses, private IP addresses, netmasks
- IPv6
- DHCP
- network device types
- routing
- local area network to Internet routing
- local area network internal routing
- quality of service, traffic shaping (example: VoIP)
- hackable routers
- network security
- firewalls, application firewalls
- port forwarding (TCP, UDP, …)
- wi-fi encryption
- VPNs
- DNS filtering and workarounds
- geolocation filtering and workarounds
- wi-fi
- concepts and standards for wi-fi (ordering this chaos …)
- WEP, WPA, WPA2, CCMP, AES, RSN, 802.11i
- 802.11a/b/g/n
- 802.1x
- channel
- SSID, ESSID, hidden networks, beacons, geolocation by SSID
- WPS
- WDS
- WiMAX
- wireless spectrum and spectrum sensing
- the idea of wireless channels
- physical signalling (the shared medium, collisions, …)
- wireless antennas
- influences on connection quality (channel interference, channel congestion / excessive collisions, mirrors, walls, distance, antenna position, antenna gain, WDS)
- timing issues for long-range connections
- concepts and standards for wi-fi (ordering this chaos …)
- Ethernet
- Ethernet and switched Ethernet
- cable quality standards (incl. using Cat3 for 10MBit Ethernet)
- cable color standards
- connecting cables (incl. improvised RJ45 crimping, soldering with a lighter)
- auto-negotiation issues
- the uplink port
- the three-device rule
- VDSL over Twisted Pair
- commercial devices
- power modem hack
- troubleshooting
- cable testing with a multimeter
- wi-fi connection quality testing (iwconfig)
- scanning for wi-fi networks
- the route command
- the ping command
- address space issues (DHCP cache times etc.)
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