文件名称：比较好的以太网入门资料介绍
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更新时间：2011-09-24 10:16:08
以太网入门资料介绍
Background The term Ethernet refers to the family of local area network (LAN) implementations that includes three principal categories. • Ethernet and IEEE 802.3—LAN specifications that operate at 10 Mbps over coaxial cable. • 100-Mbps Ethernet—A single LAN specification, also known as Fast Ethernet, that operates at 100 Mbps over twisted-pair cable. • 1000-Mbps Ethernet—A single LAN specification, also known as Gigabit Ethernet, that operates at 1000 Mbps (1 Gbps) over fiber and twisted-pair cables. This chapter provides a high-level overview of each technology variant. Ethernet has survived as an essential media technology because of its tremendous flexibility and its relative simplicity to implement and understand. Although other technologies have been touted as likely replacements, network managers have turned to Ethernet and its derivatives as effective solutions for a range of campus implementation requirements. To resolve Ethernet’s limitations, innovators (and standards bodies) have created progressively larger Ethernet pipes. Critics might dismiss Ethernet as a technology that cannot scale, but its underlying transmission scheme continues to be one of the principal means of transporting data for contemporary campus applications. This chapter outlines the various Ethernet technologies that have evolved to date.