Hubs at the Concrete Layer
Written on 09:30 by Ahmet Emir
A hub is absolutely a multiple-port repeater. A captive receives a agenda arresting and reamplifies or
regenerates that arresting and again assiduously the agenda arresting out all alive ports after looking
at any data. An alive hub does the aforementioned thing. Any agenda arresting accustomed from a articulation on
a hub anchorage is regenerated or reamplified and transmitted out all ports on the hub. This means
all accessories acquainted into a hub are in the aforementioned blow breadth as able-bodied as in the aforementioned broadcast
domain. Figure 1.17 shows a hub in a network.
Ethernet Networking 31
FIGURE 1 . 1 7 A hub in a network
Hubs, like repeaters, don’t appraise any of the cartage as it enters and is again transmitted out
to the added genitalia of the concrete media. Every accessory affiliated to the hub, or hubs, charge listen
if a accessory transmits. A concrete brilliant network—where the hub is a axial accessory and cables
extend in all admonition out from it—is the blazon of cartography a hub creates. Visually, the design
really does resemble a star, admitting Ethernet networks run a analytic bus topology, acceptation that
the arresting has to run through the arrangement from end to end.
Hubs and repeaters can be acclimated to enlarge the breadth covered by a distinct LAN
segment, although I do not acclaim this. LAN switches are affordable for
almost every situation.
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