Ethernet
Ethernet is the most common network type across all kinds of data centers across the world. It belongs to layer 1 (physical layer) and layer 2 (link layer) in the OSI model (Figure 1-2). Ethernet makes the foundation for the upper layer protocols such as IP, UDP, and TCP, which further transport many types of storage protocols. 以太网是全球各类数据中心最常见的网络类型。它属于 OSI 模型中的第 1 层（物理层）和第 2 层（链路层）（图 1-2）。以太网为 IP、UDP 和 TCP 等上层协议奠定了基础，而 IP、UDP 和 TCP 则进一步传输多种类型的存储协议。
End devices connect to an Ethernet network using Network Interface Cards (NICs). This book uses GbE (Gigabit Ethernet) as a suffix to refer to various Ethernet speeds, such as 10 GbE and 25 GbE. 终端设备使用网络接口卡（NIC）连接到以太网网络。本书使用 GbE（千兆以太网）作为后缀来指代各种以太网速度，如 10 GbE 和 25 GbE。
Fibre Channel (FC)
Fibre Channel is the most common type of network for transporting SCSI and NVMe protocols for accessing remote block storage. As Figure 1-2 shows, it has dedicated layers for physical interface (FC-0), encoding and decoding (FC-1), framing (FC-2), network services (FC-3), and transporting upper layer protocols (FC-4). While this entire stack is referred to as Fibre Channel, at FC-4 layer, Fibre Channel Protocol (FCP) provides mapping to the Upper Layer Protocols (ULP), such as SCSI and NVMe. 光纤通道是最常见的网络类型，用于传输 SCSI 和
