1 In computers, a utility is a small program that provides an addition to the capabilities provided by the operating system. This is
also optimized to perform at its best also it is configured so it makes it possible to run on the operating system that your computer
system is running.
2.1 A firewall is a system designed to prevent unauthorized
access to or from a private network. Firewalls can be
implemented in both hardware and software, or a
combination of both.
2.2 Common firewall
2.2.1 Firewalls are used to protect both home and corporate networks. A typical firewall program or
hardware device filters all information coming through the Internet to your network or computer
system. There are several types of firewall techniques that will prevent potentially harmful
information from getting through
188.8.131.52 Proxy server
184.108.40.206.1 A proxy server intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.
220.127.116.11 Packet Filter
18.104.22.168.1 Looks at each packet entering or leaving the network and accepts or rejects it based on user-defined
rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In
addition, it is susceptible to IP spoofing.
22.214.171.124 Application Gateway
126.96.36.199.1 Applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very
effective, but can impose a performance degradation.
188.8.131.52 Circuit-level Gateway
184.108.40.206.1 Applies security mechanisms when a TCP or UDP connection is established. Once the connection has
been made, packets can flow between the hosts without further checking.