MCSE : Security Specialist
Identify the following security protocols and describe their
purpose and function:
IPsec
IP
Security, is a set of protocols used to support secure exchange of
packets at the IP layer.
IPsec
supports two encryption modes: Transport and Tunnel. Transport mode
encrypts only the data portion of each packet, but leaves the header
untouched. The more secure Tunnel mode encrypts both the header and
the data portion.
For
IPsec to work, the sending and receiving devices must share a public
key. This is accomplished through a protocol known as Internet
Security Association and Key Management Protocol/Oakley, which
allows the receiver to obtain a public key and authenticate the
sender using digital certificates.
L2TP
Layer
Two Tunneling Protocol, an extension to the PPP protocol that
enables ISPs to operate Virtual Private Networks. L2TP combines the
best features of two other tunneling protocols: PPTP from Microsoft
and L2F from Cisco Systems.
PPTP
PPTP
is a networking technology that supports multiprotocol virtual
private networks, enabling remote users to access networks securely
across the Internet by dialing into an ISP or by connecting directly
to the Internet.
SSL
Secure Sockets Layer is a protocol that supplies secure data
communication through data encryption and decryption. SSL enables
communications privacy over networks by using a combination of
public key, and bulk data encryption.
Kerberos
An
authentication system, Kerberos is designed to enable two parties to
exchange private information across an open network. It works by
assigning a unique key, called a ticket, to each user that logs on
to the network. The ticket is then embedded in messages to identify
the sender of the message.
|
