September 2012
Intermediate to advanced
1680 pages
88h 3m
English
For Layer 2 tunneling technologies, such as PPTP, L2TP, and SSTP, a tunnel is similar to a session; both of the tunnel endpoints must agree to the tunnel and must negotiate configuration variables, such as address assignment or encryption or compression parameters. In most cases, data transferred across the tunnel is sent using a datagram-based protocol. A tunnel maintenance protocol is used as the mechanism to manage the tunnel.
Layer 3 tunneling technologies generally assume that all the configuration settings are preconfigured, often by manual processes. For these protocols, there might be no tunnel maintenance phase. For Layer 2 protocols (PPTP, L2TP, and SSTP), however, a tunnel ...
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