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Reflective attacks typically use protocols that do not require authentication or handshake, Reflection attacks need to forge the source IP address of the requested data into the IP address of the target. If the protocol used requires authentication or handshake, the authentication or handshake process cannot be completed and the next attack cannot be carried out. Therefore, the vast majority of reflection attacks are carried out using network services based on UDP protocol.　　一次一次对立的任务，让他们慢慢的了解对方，慢慢的欣赏对方，各自在完成任务的同时，也在进行着相互策反。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia张大栓和张槐跑来紧张地问：可咬伤了？一边拉住玉米和花生，上下查看，一边骂他们淘气，才回来就惹事。大叔马克面临中年危机，却并不能像一个中年男人那样妥善应对:他话唠，经济虽不至于捉襟见肘，但因不善理财，经济危机好像随时有可能发生。王小米一直以来的梦想就是能被当作公主对待，以为嫁了和自己母亲一样大的大叔马克就能实现被宠爱的梦想，但她没想到享受了大叔的成熟和稳定，就要承受他性格中已经既定无法和你磨合的部分。除此之外，小后妈还要面临大叔叛逆腹黑的十五岁女儿马莉，淘气的五岁儿子马瑙，以及和自己奶奶年纪相仿的婆婆，以及那个想要和前夫重修旧好的前妻。小后妈要想得到自己想要的爱情，必须逐个搞定这些七七八八的障碍，让这些“二手亲人”爱上自己，并发自内心地爱上他们。但是现在呢？再一次的一败涂地，事实和血的教训告诉他，自己和项羽实在差的太远了。