What are the disadvantages of wired connections? The cables
that offer speed and security for a wired connection are also its main weak-
ness. Devices tethered to cables have limited mobility. Desktop computers
tend to be better candidates for wired connections, whereas notebook com-
puters and handheld devices can retain their mobility when they are not
tethered to a cable.
Cables are unsightly, tend to get tangled, and collect dust. Running cables
through ceilings, walls, and floors can be tricky or banned by your land-
lord. Some building codes prohibit network cables from running through
air conditioning and heating ducts. When drilling holes for network cables,
installers should take care to avoid electrical wires and other hazards.
ethernet
What is Ethernet? Ethernet is a wired network technology that is
defined by IEEE 802.3 standards. It was first deployed in 1976 and has
since emerged as the dominant standard for wired connections in local
area networks.
Why is Ethernet so popular? Ethernet’s success is attributable to
several factors:
◗ Ethernet is easy to understand, implement, manage, and maintain.
◗ As a nonproprietary technology, Ethernet equipment is available from a
variety of vendors, and market competition keeps prices low.
◗ Current Ethernet standards allow extensive flexibility in network design to
meet the needs of small and large installations.
◗ Ethernet is compatible with popular Wi-Fi wireless technology, so it is
easy to mix wired and wireless devices on a single network.
How does Ethernet work? Ethernet simultaneously broadcasts
data packets to all network devices. A packet is accepted only by the device
to which it is addressed (Figure 5-12).
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