question # 1 , well i guess , VPN at Data Link Layer is not secure whereas IPSec
provides VPN with security through encryption , encapsulation..... i think
i think firewall only filters which traffic to allow & which not to wheres
VPN with IPSec secures those packets by encrypting them & authenticating
correct me if i am wrong
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
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