什么是Packet Sniffing?（什么是清华大学的定向生）

当任何数据要通过计算机网络传输时，它在发送方节点被分解成更小的单元，称为数据包，并在接收方节点以原始格式重新组装。它是 通过计算机网络进行通信的最小单位。通过计算机网络捕获数据包的行为称为数据包嗅探。它具有监控网络性能或解决网络通信问题的合法用途。但是，它也被黑客和破解者广泛用于非法收集有关他们打算闯入的网络的信息。

数据包嗅探是通过使用称为数据包嗅探器的软件或设备完成的。使用数据包嗅探器，可以捕获密码、IP 地址、网络上使用的协议等数据，以及可以帮助攻击者渗透网络的其他信息。数据包嗅探器是一种实用程序，它可以在不以任何方式修改网络数据包的情况下进行嗅探。为防止数据包嗅探，用户应加密发送或接收的数据。用户应仅使用受信任的 Wi-Fi 网络并定期扫描网络是否存在危险或问题。

Packet Sniffing

When any data is to be transmitted over a computer network, it is broken down into smaller units at the sender’s node called data packets and re-assembled at receiver’s node in the original format. It is the smallest unit of communication over a computer network. The act of capturing data packet across the computer network is called packet sniffing. It has legitimate uses to monitor network performance or troubleshoot problems with network communications. However, it is also widely used by hackers and crackers to gather information illegally about networks they intend to break into.

Packet sniffing is done by using a software or device called packet sniffer. Using a packet sniffer, it is possible to capture data like passwords, IP addresses, protocols being used on the network, and other information that can help the attacker infiltrate the network. A packet sniffer is a utility that sniffs without modifying the network’s packets in any way. To prevent packet sniffing the user should encrypt the data sent or received. User should use only trusted Wi-Fi networks and regularly scan the network for dangers or issues.