CppNetwork

Network programing library for C++. Socket, Server, and Client will be covered.

Knowledge

Sockets

Stream Sockets

• TCP - The Transmission Control Protocol
• Reliable two-way connected communication streams
• Order of received packet will be order of sent packet
• Error free
• Slower than Datagram Socket

Datagram Sockets

• UDP - User Datagram Protocol
• Connectionless, it does not require the connection
• Unreliable, some packets can be lost/dropped
• Fast!

IP Address

The Internet Protocol Version 4

• IPv4
• Consist of 32-bit(4-bytes) (e.g. 127.0.0.1.)
• Loopback: 127.0.0.1.
• All internet website uses IPv4

The Internet Protocol Version 6

• IPv6
• Consist of 128-bit (e.g. 0000:0000:0000:0000:0000:0000:0000:ffff)
• Loopback
  • ::1
  • ::1/128
  • ::ffff:127.0.0.1

Subnets

• netmask
  • Class A: 255.0.0.0
  • Class B: 255.255.0.0
  • Class C: 255.255.255.0
• Put subnet by adding slash after IP address
  • e.g. 127.0.0.1/17

Port Number

16-bit number used by socket to find the connection in the local

• Service can be differentiated by port number with same IP Address