The course consists of two parts: lectures and laboratory. The lecture part covers fundamentals of protocol implementation: protocol design, specification, verification and testing as well as implementation issues including packet classification and filtering, retransmissions and efficiency. Linux traffic control, kernel threads and implementation of IP and TCP are examined as practical examples. The laboratory part consists of 3 projects covering protocol design, protocol specification and verification using SDL, and implementation of a small extension or modification to existing protocol implementation. Prerequisites: Operating systems, Internet protocols, Programming in C, and Network programming. Course exam ??? ??nd March from ??.00 to ??.00.