What is TCP?

• TCP is a connection-oriented transport protocol

• Counterpart to UDP

• • Applications can only use one or the other for each stream

• Explicit connection management

• • Establishment, maintenance, and teardown

• Provides end-to-end reliability

• • Bit-error detection via checksum
  • Detection and retransmission of lost packets
  • Re-ordering of out-of-order packets
  • Deletion of duplicate packets

• Like UDP, uses port numbers so that an IP stack can give packets to a specific application, process or thread

• • IP protocol 6