Cisco CCENT Flash Cards: Understanding Ethernet and Switch Operations

Date: Aug 30, 2013

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To help in your CCENT preparations, this chapter covers the fundamentals of Ethernet technologies and describes how switches operate.

Section 3. Understanding Ethernet and Switch Operations

Ethernet is the technology of choice for today’s LANs. It is fast, has low costs, and is easy to maintain. Today’s Ethernet standards support speeds of 10 Mbps, 100 Mbps, 1 Gbps, 10 Gbps, and 40 Gbps.

Ethernet functions at Layers 1 and 2 of the Open Systems Interconnection (OSI) model. As such, Ethernet standards specify cabling, signaling, and data link layer addressing.

Because most LANs use Ethernet as the primary Layer 2 technology, most switches today are Ethernet switches. This section covers the fundamentals of Ethernet technologies and describes how switches operate.

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