SECURITY PROTECTION DESIGN OF
COMPUTER NETWORK
3.1 Firewall Design
Viruses and Trojan horses are the main factors affecting the safety
of computer network, so the problem of them should be solved
firstly. Lots of people believe that viruses and Trojan horses cause
the same harm. Essentially, Viruses and Trojan horses are
computer programs. Viruses are normally written software
program with an infinite loop, which will lead system to collapse.
Then some malicious program was written by taking advantage of
this characteristic. If infected by the virus, the computer will lose
its normal function. But Trojan is normal procedure, using a
loophole in the system to control the computer. Thus it can be
seen that the dangers of the virus cannot be controlled, but the
Trojan is usually a client and can be controlled. In fact, all kinds
of security problem can be solved by installing a firewall. In
actual network, corresponding firewall and anti-virus software
should be installed. Restricting users’ irregularities can reduce the
rate of computers infected by viruses or Trojan horses. Even if
accidentally infected by virus, antivirus software can search and
kill it. Therefore, the firewall and anti-virus software are
important components of computer network security protection.