SSH and HTTPS
Telnet does not encrypt anything; that is why it is too insecure to use as a network protocol.
To encrypt data
frame
The answer is Protocol's. Protocol is the set of rules for formatting the data across the network.
Packets
ICMP (Internet Control Message Protocol)
a way for transmitting data form one computer to the another across a network is called as communication protocol
The File Transfer Protocol is a standard network protocol used for the transfer of computer files from a server to a client on a computer network. FTP is built on a client-server model architecture using separate control and data connections between the client and the server
To ensure data delivery.to ensure that data arrives at its destination in the proper sequence
1 tcp transmission control protocol 2 udp protocol
L2TP is a tunneling protocol for an IP network. L2 data is transmitted over the network but has no encryption or authentication abilities. This type of protocol is usually paired with IPSec to provide encryption and authentication.
A network protocol allows two data communication devices to be able to talk to each other. They are necessary because your web browser gets data down to your network card and out onto the network cable