Network security theme blackboard photo daquan II
Network security theme Blackboard photo collection 3 What is network security?
Network security means that the hardware and software of the network system and the data in the system are protected, which will not be destroyed, changed or leaked due to accidents or malicious reasons. The system can run continuously, reliably and normally, and the network service will not be interrupted.
What is a computer virus?
Computer virus refers to a set of computer instructions or program codes inserted by a compiler in a computer program, which destroys computer functions or data, affects the use of computers and can replicate itself.
What is a Trojan horse?
Trojan horse is a malicious remote control software. Trojans are generally divided into client and server. The client is the console of various commands used locally, while the server is for others to run, and only the computer running the server can fully control it. Trojan horses don't infect files like viruses.
What is a firewall? How does it ensure network security?
Using functional firewall is a way to ensure network security. Firewall refers to the combination of a series of components set between different networks (such as trusted intranet and untrusted public network) or network security domains. It is the only entrance and exit of information between different networks or network security domains. It can control (allow, deny and monitor) the information flow in and out of the network according to the enterprise's security policy, and has strong anti-attack ability. It is the infrastructure to provide information security service and realize network and information security.
What is the back door? Why is there a back door?
Backdoor refers to a method of accessing a program or system by bypassing security control. In the development stage of software, programmers often create backdoors in software so that they can modify the defects in the program. If the backdoor is known to others, or it is not deleted before the software is released, it will become a security risk.