23 Hardware based on either standard can, in fact, interoperate.
24 In typical enterprise LAN Ethernets these days, each workstation is connected over a dedicated point-topoint
link to a switch in a hub/star topology and communicates (usually in a full-duplex manner) over this
link. Hence, the issue of colliding with frames from another workstation on theLAN simply does not arise.
Ethernet: From LAN to the WAN 13
?– Speed/Bandwidth Increased line speed to 10 Gb/s and higher (a thousand-fold
increase from the initial 10M bandwidth)
?– Media Enabled transmission over a host of wired and wireless media
?– Processing Added new capabilities to identify, separate, prioritize, and secure
data
?– Scale Continually made it more robust and operationally efficient to deploy and
manage large Ethernets
These and other key developments in the Ethernet standard are listed in Table 1.1
and illustrate the continuous improvements that Ethernet continues to undergo. Two
IEEE25 working groups, 802.3 and 802.1, were particularly active in extending Ethernet
to operate beyond the LAN. A detailed discussion of these standards is beyond the scope
of this book, but they are actively referenced wherever necessary.
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