Transport Layer

Transport layer protocols are the next OSI layer on top of IP and offer a communication channel abstraction. The two most common protocols today are TCP, which offers a connection-oriented communication channel, and UDP, a connectionless protocol.

In Go, the way you interact with both protocols is similar, even though the underlying packet exchange may be completely different. At a high level, there are only a few things that you need to keep in mind when dealing with TCP or UDP:

• Each TCP or UDP application works with a corresponding connection represented by a concrete TCPConn or UDPConn type, respectively.
• Go has other connection types with overlapping features like PacketConn that deals with connectionless protocols (UDP, IP), Conn that covers IP, TCP and UDP, and UnixConn for connections to Unix domain sockets. We only focus on TCPConn and UDPConn in this section.
• Clients use net.DialTCP and net.DialUDP to open a socket to a remote address.
• Servers use net.ListenUDP...