I INF 306 Lecture Notes - Lecture 3: Internet Assigned Numbers Authority, Internet Engineering Task Force, Defense Information Systems Agency

• School: SUNY Albany
• Department: Information Science
• Course: I INF 306
• Professor: William Augustine

Document Summary

Arpanet: 1969, 1975, 1983, 1989 world wide web to operational. Ieee802. 3: nic, guided media, cables, switching devices, hubs, switches (l2, routers (l3, csma/cd, has collision detection, back-off and retransmission. Ssid broadcast / wardriving: satellite, terrestrial microwave, cellular. Protocols define format, order of messages sent and received among network entities, and actions taken on message transmission and upon receipt: request for comments (rfcs, internet standards body, internet official protocol standards. Protocol layers: tcp/ip, 5 layer model. The technique used by layered protocols in which a layer adds header information to the protocol data unit (pdu) from the layer above: header: metadata fields, payload: user data, or header+payload from another layer. Provides for protocol layer independence: like matryoshka dolls. Host addresses: layer 3: ip address, ipv4 32 bits , ipv6 128bits, logical address, assigned by software (static or dynamic, localhost. 127. 0. 0. 1: layer 2: mac address, 48 bits, physical address, assigned in firmware.