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In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.In system development, some objects cannot be accessed directly due to network or other obstacles. At this time, a proxy object can be used to access the target object. Such as calling Web services in. NET.想着不能误人子弟，他便正身肃容，将《大学》中修身齐家的道理略解释了些，又引述《孟子》尽心章中的词句，言明男子若是不以正道用人，便是自己妻子也难以使唤。军士们都用吃奶的劲儿喊了出来。(1) Starting from the target of communication, enterprises should focus on the behavior and mentality of the target consumer groups when selecting stars. All take the target audience group as the center, can arouse the sympathy and support of the target consumer group.只能救下司马欣，先将他软禁几日，否则章邯得知消息难免绝望。