means all devices plugged into a hub are in the same collision domain as well
as in the same broadcast domain.
device connected to the hub, or hubs, must listen if a device transmits. A
physical star network--where the hub is a central device and cables extend
in all directions out from it--is the type of topology a hub creates. Visually,
the design really does resemble a star, whereas Ethernet networks run a log-
ical bus topology, meaning that the signal has to run from end to end of the
network.
it's readily scalable, meaning it's comparatively easy to integrate new tech-
nologies, like FastEthernet and Gigabit Ethernet, into an existing network
infrastructure. It's also relatively simple to implement in the first place, and
with it, troubleshooting is reasonably straightforward. Ethernet uses both
Data Link and Physical layer specifications, and this section of the chapter
will give you both the Data Link and Physical layer information you need to
effectively implement, troubleshoot, and maintain an Ethernet network.
evenly without having two devices transmit at the same time on the network
medium. CSMA/CD was created to overcome the problem of those collisions
that occur when packets are transmitted simultaneously from different
nodes. And trust me, good collision management is crucial because when
a node transmits in a CSMA/CD network, all the other nodes on the net-
work receive and examine that transmission. Only bridges and routers can
effectively prevent a transmission from propagating throughout the entire
network!
on the wire. If all is clear (no other host is transmitting), the host will then
proceed with its transmission. But it doesn't stop there. The transmitting