A network attack is a user's use of vulnerabilities and security flaws in the network to attack hardware, software, and data on the network. There are many kinds of network attacks. The common attacks on the network include DDOS attacks, SYN attacks, ARP attacks, Trojans, viruses, etc., and the secure servers can not avoid network attacks. As a network security operation and maintenance personnel, you need to maintain the security of the system, repair known system vulnerabilities, etc., and need to deal with attacks quickly when the server is attacked, to minimize the impact of the attack on the network. So what do you need to do after the server is attacked? Generally, you can follow these steps: The server is attacked because it is connected to the network. Therefore, after confirming that the system is under attack, the first step must be to disconnect the network, that is, disconnect the attack. Analyze according to the system log, check all the suspicious information to find out the attacker. According to the system log analysis, to see how the attacker invaded the server, through analysis to find out the vulnerabilities in the system. When backing up system data, be sure to check whether the backed up data is mixed with the attack source. If it exists, it must be deleted in time. Be sure to reinstall the system after being attacked, because we can't completely confirm the attacker's attack methods. Therefore, the attack source can be completely removed by reinstalling the system. After reinstalling the system, import the safe data information into the system, and check whether there are other vulnerabilities or security risks in the system, and if there is any timely repair. After everything is ok, connect the system to the network and resume service.
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