Connectivity protocols are:
TCP - Transmission Control Protocol provides connection-oriented traffic (guaranteed delivery). TCP uses a three-way handshake
UDP - User Datagram Protocol provides connectionless sessions (without a three-way handshake)
IP - The Internet Protocol identifies hosts in a TCP/IP network and delivers traffic from one host to another using IP addresses
ICMP - Internet Control Message Protocol is used for testing basic connectivity and includes tools such as ping, pathping, and tracert.
ARP - Address Resolution Protocol resolves IP addresses to media access control (MAC) addresses.