What is a network security device?

Network security devices include IP protocol encryption machines, secure routers, line encryption machines, firewalls, etc. In addition to the aforementioned devices, broad information security devices also include cryptographic chips, encryption cards, identity recognition cards, telephone encryption machines, fax encryption machines, asynchronous data encryption machines, security servers, security encryption suites, financial encryption machines/cards, security middleware, public key infrastructure (PKI) CA systems, secure operating systems, antivirus software, network/system scanning systems, intrusion detection systems, network security warning and auditing systems, etc.
Firewall settings can be used to prevent Internet or external network users from accessing the internal network, or to provide more restrictive conditions for such access. Firewall devices should be installed at the interface between the network system and external networks; The server must be placed behind a firewall. Specific virus prevention measures should adopt a combination of gateway antivirus, email antivirus, server antivirus, network host antivirus, and other antivirus measures to form a cross functional and comprehensive virus protection system. Gateway antivirus is achieved by deploying servers behind firewalls, installing antivirus software, and scanning for viruses and filtering malicious code from files that enter the internal network using HTTP, FTP, and SMTP protocols. If there is a mail server, corresponding antivirus software should be installed according to the software configuration of the mail server. Server antivirus is generally customized and installed based on its operating platform (such as NT, UNIX, LINUX, NetWare, etc.), and security configuration is carried out; Different server application scopes also require different configuration strategies, such as WEB SITE, DNS, NOTES servers, database intermediate layer processing servers, and other commercial application servers. Each host in the network should also have antivirus software installed.