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Chapter 1
Introducing the Contivity Extranet Switch
The Switch
The Nortel Networks Contivity Extranet Switch 4500 provides scalable, secure,
manageable extranet access for up to 5000 simultaneous users across the Public
Data Network (PDN).
The Switch's features include the most popular tunneling protocols, IP Security
(IPsec), Point-to-Point Tunneling Protocol (PPTP), Layer 2 Forwarding Tunneling
Protocol (L2TP), and Layer 2 Forwarding (L2F). IPsec uses digital certificates,
password-based keys, and tokens for authentication; PPTP, L2TP, and L2F use
Challenge Handshake Authentication Protocol (CHAP) or Password
Authentication Protocol (PAP) for authentication. The PPTP and L2TP
implementations for the Switch support MS-CHAP authentication with 56- to
128-bit key encryption.
Figure 1-1 shows an intranet and an extranet.