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The full name of UDP protocol is user datagram protocol. It is used to process data packets like TCP protocol in the network and is a connectionless protocol. In the OSI model, the fourth layer, the transport layer, is the next layer above the IP protocol. UDP has the disadvantages of not providing packet grouping, assembling and sorting packets, that is, when the message is sent, it is impossible to know whether it arrives safely and completely.These are the simplest attacks. The attacker simply sends a large number of packets to the target, thus exhausting all resources. The resources used may only be bandwidth. These attacks include ICMP and UDP flooding.秦王嬴稷（秦昭王）当政不久，列国展开一系列兼并战争。秦国看准时机，先与齐连横，攻略魏国大片土地。由此，战国进入秦齐赵三国并强阶段。此时，秦国国内宣太后掌政，穰侯魏冉等“四贵”专权、，秦昭王王权旁落。然而外部局势对秦国十分有利：纵横家苏秦与燕王秘约赴齐，以灭秦为目标“死间”齐国。面对国内政治困局和国外有利机遇，秦王嬴稷毅然起用范雎，放逐魏冉等“四贵”、废太后之权而恭养之。同时，与苏秦合谋，五国联军在燕将乐毅率领下攻破齐国都城临淄。秦王嬴稷遣将白起，相继在伊阙、郢都、华阳、长平发动四大战役，歼灭了韩魏齐楚赵百万以上兵力，使秦与列国消长发生了根本转折。自此，秦国崛起 。2018-03-04 16:41:14以塞尔柱帝国苏丹马立克沙一世为主角，讲述一场为追求世界秩序和正义，充满爱，秘密和汗水的史诗之旅。117. X.X.2