Describe Security Devices and the Problems they may cause.
Security Hardware Problems caused by Devices
Web sites may fail due to outside attacks by hackers, who manage to gain access to the system and steal or corrupt data.
Over the last few years there have been a number of attacks both in the private and the public sectors, which have increased concern about the importance of security hardware.
What is security hardware?
The security hardware's goal is to ensure that data stored in a computer cannot be accessed or altered by unauthorized users. To prevent
unauthorized access to or from a private network, such as an intranet, a firewall server is used. The firewall is the first line of defense
against unwanted users. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those
that do not meet the specified security criteria.
The packet-level gateway is the most basic and inexpensive kind of firewall. It consists of a router configured with standard packet-filtering that scans each packet's header for authorized IP addresses and specified types of traffic.
Unauthorized packets are simply discarded.
2) Application-level gateway
The application-level gateway (proxy server) is more secure than the packet-level gateway and harder to configure. It acts as an intermediary between clients and servers and uses server programs called proxies to examine external requests
and forwards authorized requests to the appropriate internal host.
3) Circuit-level gateway
The circuit-level gateway relays TCP connections. It copies bytes back and forth from either side of the firewall creating a virtual circuit.
It's best for trusted internal users who also need to do work outside the firewall. It's the safest of the three types of firewalls, but also the most difficult to configure.
Common problems of security hardware
Users may experience problems caused by their own security hardware. For example, a user may not be able to access or download from certain
Web sites if the firewall configuration is faulty or if there is a router IP filtering problem. A faulty firewall configuration or the lack of sufficient client memory may also cause errors when the user attempts to download plug-ins.
Three types of Firewalls
There are three different types of firewalls. They vary in cost as well as level of configuration complexity and safety. From the simplest to the most complex, these firewalls are known as Packet-level gateways, Application-level gateways, and Circuit-level
gateways. In the next lesson, you will learn about strategies for dealing with common hardware risks.