随着DDoS（Distributed Denial of Service，分布式拒绝服务）攻击的技术门槛越来越低，使其成为网络安全中最常见、最难防御的攻击之一，其主要目的是让攻击目标无法提供正常服务。请列举常用的DDoS攻击防范方法。
正确答案及解析
正确答案
解析
1.购买运营商流量清洗服务2.采购防DDos设备3.修复系统漏洞，关闭不必要开放的端口4.购买云加速服务5.增加出口带宽，提升硬件性能6. CDN加速
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