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31 Days Before Your CCENT Exam: Ethernet and Media Access Control

Chapter Description

To help you prepare for your CCENT exam. this chapter reviews Ethernet technologies and operation at both the data link and physical layers.

Current Ethernet Technologies

Refer to Figure 29-1 and notice the different 802.3 standards. Each new physical layer standard from the IEEE requires many differences at the physical layer. However, each of these physical layer standards uses the same 802.3 header, and each uses the upper LLC sublayer as well. Table 29-1 lists today’s most commonly used IEEE Ethernet physical layer standards.

Table 29-1 Today’s Most Common Types of Ethernet

Common Name

Speed

Alternative Name

Name of IEEE Standard

Cable Type,Maximum Length

Ethernet

10Mbps

10BASE-T

802.3

Copper, 100 m

Fast Ethernet

100Mbps

100BASE-TX

802.3u

Copper, 100 m

Gigabit Ethernet

1000Mbps

1000BASE-LX

802.3z

802.3z

Gigabit Ethernet

1000Mbps

1000BASE-T

802.3ab

Copper, 100 m

10GigE (Gigabit Ethernet)

10Gbps

10GBASE-T

802.3an

Copper, 100 m

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