or Table 2 Security Devices - How they work and their CIA category. Security or Description HW CIA Category Infrastructure (What type of device is it and what Element does it do? If network device, which sw layer does it operate at?] Firewall A firewall is a dedicated security HW, SW & C&A mechanism. It can be hardware, Combination software or a combination of both. Its The firewall is trying job is to "filter' traffic as it enters or to prevent the leaves a network network being compromised or Firewalls can be stateful or stateless, flooded. If it is meaning that they can either inspect the compromised, actual content of packets in transit confidentiality may be (stateful) in order to detect malicious affected. If the messages, or simply monitor where network suffers a packets are coming from and going to DoS availability will (stateless). be affected. Access Control List Routers Encryption Switch Group Policy Intrusion Detection System