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Which is NOT a core protection method against DoS and DDoS network attacks?
Close unneeded ports
Keep antivirus software up to date
Filter traffic at firewalls
Disable unnecessary services and protocols
DoS and DDoS attacks are not caused by computer viruses per se. Because Antivirus "core or primary" job is to reduce the possibility of viruses. Hardening systems via closing unnecessary ports and services, use of packet-filtering firewalls, and disabling services, ports, guest and local admin accounts drastically reduces the chance of DD/DoS attacks.
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