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31 Days Before Your CCNA Exam: Connecting Switches and Ethernet Technology

Chapter Description

Allan Johnson provides late study tips and resources for Ethernet and switching topics on the CCNA 640-802 exam.

Current Ethernet Technologies

Refer back to Figure 28-1 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 28-1 lists today’s most commonly used IEEE Ethernet physical layer standards.

Table 28-1. Today’s Most Common Types of Ethernet

Common Name

Speed

Alternative Name

Name of IEEE Standard

Cable Type, Maximum Length

Ethernet

10 Mbps

10BASE-T

IEEE 802.3

Copper, 100 m

Fast Ethernet

100 Mbps

100BASE-TX

IEEE 802.3u

Copper, 100 m

Gigabit Ethernet

1000 Mbps

1000BASE-LX, 1000BASE-SX

IEEE 802.3z

Fiber, 550 m (SX) 5 km (LX)

Gigabit Ethernet

1000 Mbps

1000BASE-T

IEEE 802.3ab

Copper, 100 m

10GigE (Gigabit Ethernet)

10 Gbps

10GBASE-SR, 10GBASE-LR

IEEE 802.3ae

Fiber, up to 300 m (SR), up to 25 km (LR)

10GigE (Gigabit Ethernet)

10 Gbps

10GBASE-T

IEEE 802.3an

Copper, 100 m

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