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3.0. e TLS protocol is misnamed because it operates well above the transport layer
(Open System Interconnection [OSI] Layer 4). TLS is used extensively to secure cli
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ent-server connections on the World Wide Web (TLS is a stateful protocol). Although
these connections can often be characterized as short-lived and exchanging relatively
small amounts of data, TLS is also in use in environments in which connections
can be long-lived, and the amount of data exchanged can extend into thousands or
millions of octets. For example, TLS is now increasingly used as an alternative VPN
connection. Compression services have long been associated with IPSec and Point-
to-Point Tunneling Protocol (PPTP) VPN connections, so ...