Review: properties of networks

• networking architecture
• error detection
• device drivers
• performance -- latency, throughput, why things get complicated, high-speed networks
• sliding window
• congestion control, fairness
• presentation layer: encoding, compression, security

Review: specific technologies and protocols

• ATM: connections, QoS, cells, AALs
• ethernet: formats, properties
• routing, bridging, hubs
• TCP/IP:
  • formats and properties
  • IP addresses, ARP, DNS
  • ICMP, UDP, IPv6
  • TCP connections
  • TCP reliability
  • sliding window
  • flow and congestion control

Review: implementation architectures

• Xinu (a teaching OS):
  • guiding principles: clarity, modularity, no need for expensive machines
  • queues, threads, context switches
• x-kernel (a research OS):
  • principles: speed, modularity, (almost) no data copies or context switches
  • upcalls, metaprotocol
• Linux (a production OS):
  • principles: speed, completeness, usefulness
  • threads, queues, traditional structure