Securing EC Networks  Many technologies exist to ensure that an organization¶s networks is secured or detected when intruded. authentication to ensure that information has not been tampered with. .  Personal firewall: a network node designed to protect an firewall: individual user¶s desktop system from the public network by monitoring the traffic that passes through the computers network interface.  Virtual private networks (VPN): a network that uses the (VPN): public Internet to carry information but remains private by using encryption to scramble the communications.  Firewall: a network node consisting of both hardware and Firewall: software that isolates a private network from a public network. and access control to verify the identity of anyone using the network  Intrusion detection systems (IDS): a special category of (IDS): software that can monitor activity across a network or on a host computer. watch for suspicious activity. and take automated actions based on what it sees.