Serial Line Internet Protocol (SLIP) and
Point-to-Point Protocol (PPP) allow users to log on remotely to a
network using a device such as a modem (a dial-up connection through
an analog telephone line). Although it is available for Windows 95 and
NT desktops, SLIP was originally designed to connect UNIX platforms to
a remote network. SLIP was one of the first remote connectivity
protocols. However, with new technology and better security, SLIP is
being replaced by PPP.
PPP was designed to replace all the
older technology SLIP. It provides asynchronous and bit-oriented
synchronous encapsulation, network protocol multiplexing, session
negotiating, and data-compression negotiation, while supporting
protocols such as IPX/SPX, DECnet, and TCP/IP. PPP uses the High-Level
Data-Link Control (HDLC) protocol for data encapsulation during
transmission and establishes and maintains connections using the Link
Control Protocol (LCP). Using the Network Control Protocol (NCP)
with PPP, an administrator is enabled to run different protocols
simultaneously on the same line.
Advantages of PPP over SLIP include the
fact that SLIP can only be used with TCP/IP, while PPP can use
multi-network protocols and can use these protocols simultaneously
during one session. PPP also uses DHCP to resolve IP addresses with
the server, and can handle a faster speed connection than SLIP. PPP
supports data compression and IP address negotiation, neither of which
SLIP does.
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