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Introduction An interface is a device or a system that unrelated entities use to interact. Some of the supported interfaces are Dialer, FastEthernet, Tunnel, SSL-Tunnel, VMwareInterface and Virtual-PPP.  Salient Features - Ethernet : Support for any number of Ethernet LAN ports to allow LAN segmentation and enable connectivity speeds upto 100BASE-T Ethernet technology.
- ISDN : Support for ISDN PRI (E1/T1) for leased line connections. ISDN is a circuit-switched telephone network system, which also provides access to packet switched networks, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in potentially better voice quality than an analog phone can provide. It offers circuit-switched connections (for either voice or data), and packet-switched connections (for data), in increments of 64 kilobit/s.
- Tunnel Interface which is used by a tunneling protocol when one network protocol encapsulates a different payload protocol. By using tunneling one can carry a payload over an incompatible delivery-network, or provide a secure path through an untrusted network.
- IPSec VPN over various physical interfaces as well as tunnels. It is a protocol suite for securing IP communications by authenticating and encrypting each IP packet of a data stream. IPsec can be used to protect data flows between a pair of hosts, between a pair of security gateways, or between a security gateway and a host.
- Bridge interface to connect two parts of a network together at the data link layer
- VLAN : Support for 802 .1q VLAN to have inter-VLAN routing, which is a group of hosts with a common set of requirements that communicate as if they were attached to the same broadcast domain, regardless of their physical location.
- ADSL : High-speed DSL broadband access through asymmetric DSL (ADSL) over basic telephone service
- Symmetrical High-Data-Rate DSL (G .SHDSL)
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