Vpn Faq; General Faq; What Is Vpn; Why Do I Need Vpn - ZyXEL Communications P-661HW-D Series Support Note

P-661HW-D Series Support Notes

VPN FAQ

General FAQ

1. What is VPN?

A VPN gives users a secure link to access corporate network over the Internet
or other public or private networks without the expense of lease lines. A secure
VPN is a combination of tunneling, encryption, authentication, access control
and auditing technologies/services used to transport traffic over the Internet or
any insecure network that uses the TCP/IP protocol suite for communication.

2. Why do I need VPN?

There are some reasons to use a VPN. The most common reasons are
because of security and cost.
Security
1) Authentication
With authentication, VPN receiver can verify the source of packets and
guarantee the data integrity.
2) Encryption
With encryption, VPN guarantees the confidentiality of the original user data.
Cost
1) Cut long distance phone charges
Because users typically dial the their local ISP for VPN, thus, long distance
phone charge is reduced than making a long direct connection to the remote
office.
2) Reducing number of access lines
Many companies pay monthly charges for two types access lines: (1)
high-speed links for their Internet access and (2) frame relay, ISDN Primary
Rate Interface or T1 lines to carry data. A VPN may allow a company to carry
the data traffic over its Internet access lines, thus reducing the need for some
installed lines.

3. What are most common VPN protocols?

There are currently three major tunneling protocols for VPNs. They are
Point-to-Point Tunneling Protocol (PPTP), Layer 2 Tunneling Protocol (L2TP)
and Internet Protocol Security (IPSec).

4. What is PPTP?

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