Black Box Advanced Console Server, User Manual

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BLACK BOX® CS Installation, Administration, and User’s Guide 339
Each address has a network number, an optional sub network
number and a host number. The first two numbers are used
for routing, while the host number addresses an individual
host within the network or sub network. A subnet mask is
used to extract network and sub network information from
the IP address.
IP packet filtering This is a set of facilities in network equipment that allows the
filtering of data packets based on source/destination
addresses, protocol, TCP port number and other parameters.
Packet filtering is one of the main functions of a firewall.
IPsec Short for IP Security Protocol , IPsec is an extended IP
protocol that provides encrypted security services. These
services enable authentication, as well as for access and
trustwothiness control. IPsec provides similar services as
SSL, but it works on a network layer. Through IPsec you can
create encrypted tunnels (VPN) or encrypt traffic between
two hosts.
ISDN A set of communications standards allowing a single wire or
optical fibre to carry voice, digital network services and
video. ISDN is intended to eventually replace the plain old
telephone system.
Kerberos Kerberos was created by MIT as a solution to network
security problems. The Kerberos protocol uses strong
cryptography so that a client can prove its identity to a server
(and vice versa) across an insecure network connection. 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.