互联网协议 (IP) 是互联网层中用于跨网络边界中继数据报的主要通信协议。其主要功能是根据 IP 地址将数据包从源主机传送到目标主机。IP 是一种无连接协议,提供尽力而为的传输服务,这意味着它不保证传输质量、顺序或数据完整性。

互联网协议 (IP) 是互联网层中用于跨网络边界中继数据报的主要通信协议。其主要功能是根据 IP 地址将数据包从源主机传送到目标主机。IP 是一种无连接协议,提供尽力而为的传输服务,这意味着它不保证传输质量、顺序或数据完整性。
The Internet Protocol’s design embodies the end-to-end principle. It provides a simple, universal addressing and packet forwarding service, leaving reliability to higher-level protocols like TCP. Each IP packet, or datagram, contains a header with crucial information, including the source and destination IP addresses, a Time-to-Live (TTL) field to prevent indefinite packet looping, and information about the protocol of the encapsulated data (e.g., TCP or UDP). Routers across the Internet inspect the destination IP address in each packet’s header to make forwarding decisions, consulting their routing tables to determine the next hop towards the final destination. This process is independent for each packet, meaning two consecutive packets from the same source to the same destination might take different routes. This design makes the network highly resilient to failures. The two main versions are IPv4, which uses a 32-bit address space, and its successor, IPv6, which uses a 128-bit address space to overcome IPv4 address exhaustion.
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互联网协议(IP)
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