Frage im Vorstellungsgespräch bei TeamF1 Networks

Add two numbers without using '+' symbol, OSI, TCP/IP stack their working, How ARP, RARP, DHCP, works and how it is different from others? some differences1 tcp n udp, router n switch and some more WAP to know whether it is a child process or parent process? WAP to create a mirror tree? second technical also consist of the same type of questions