[多选] Which of the following are common issues that should be considered when establishing ortroubleshooting site-to-site VPNs？（Choose all that apply.）（）
A . User authentication B . Overlapping IP address space C . GRE or IPsec configuration D . MTU size E . VPN client software F . Authentication server configured ly
固定资产折旧
离心式水泵的工作原理是怎样的？
小强与一位小朋友发生了矛盾，便骂了这个小朋友，老师并没有干涉。过了一会儿，当小强再去找那位小朋友玩时，这位小朋友不愿意和他玩了，老师所采取的这种方法属于（）。 正强化法。 自然后果法。 负强亿法。 代币疗法。
血亲设计
核保工作
Which of the following are common issues that should be considered when establishing ortroubleshooting site-to-site VPNs？（Choose all that apply.）（）
