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RE: VPN Questions

for question # 1 , well i guess , VPN at Data Link Layer is not secure whereas IPSec provides VPN with security through encryption , encapsulation..... i think so....
again i think firewall only filters which traffic to allow & which not to wheres VPN with IPSec secures those packets by encrypting them & authenticating them
Pls. correct me if i am wrong
-----Original Message-----
From: Ashish Chaurasia [mailto:ashish.chaurasia@xxxxxxxxxxxxx]
Sent: Thursday, September 13, 2001 5:25 PM
To: ipsec-policy@xxxxxxxx
Cc: Ashish Chaurasia
Subject: VPN Questions

I m working on VPN using IPSec protocol. But I have some   doubts in my mind.
1.  What is the advantage of implementing VPN using IPSec protocol that works at Network layer, even though the implementations of VPN at Data Link layer are available such as L2TP,L2F, PPTP etc ?
2. What extra does VPN support in comparision to the combination of Firewall and PKI ?
3. What are the advantages of having security at Network Layer than having security at other layers of TCP/IP stack.