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■    Serial Line Internet Protocol (SLIP)

■    Point-to-Point Protocol (PPP)

■    Point-to-Point Tunneling Protocol (PPTP)

■    Remote Access Services (RAS)

■    Independent Computing Architecture (ICA)

Serial Line Internet Protocol (SLIP)

In 1984, students at the University of California at Berkeley developed SLIP for Unix as a way to transmit TCP/IP over serial connections (such as modem connections over POTS). SLIP operates at both the Physical and Data Link layers of the OSI model. Today, SLIP is found in many network operating systems in addition to Unix. It is being used less frequently with each passing year, though, because it lacks features when compared with other protocols. Although a low overhead is associated with using SLIP and you can use it to transport TCP/IP over serial connections, it does no error checking or packet addressing and can be used only on serial connections. SLIP is used today primarily to connect a workstation to the Internet or to another network running TCP/IP.

SLIP does not support encrypted passwords and therefore transmits passwords in clear text, which is not secure at all.

Setting up SLIP for a remote connection requires a SLIP account on the host machine and usually a batch file or a script on the workstation. When using SLIP to log in to a remote machine, a terminal mode must be configured after login to the remote site so that the script can enter each parameter. If you don’t use a script, you will have to establish the connection and then open a terminal window to log in to the remote access server manually.

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