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Animation 6_1 |
Ethernet is a broadcast LAN technology; a computer transmits data
by sending the data across the entire Ethernet and the data is
received by every NIC attached to the network; only the NIC whose
address appears in the destination field of the Ethernet frame
delivers the frame to the attached computer; the other NICs
discard the frame.
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Animation 6_2 |
Ethernet technology employs Carrier Sense Multiple Access/Collision
Detection to arbitrate the use of the single Ethernet cable among
computers attached to the network; each computer waits until the
Ethernet is available (as indicated by the absence of the
carrier) before transmitting data.
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Animation 6_3 |
Token ring is a broadcast technology using ring topology; the
each computer passes bits from its upstream neighbor to its
downstream neighbor and make a local copy if its is the
recipient of the frame; the token is used to arbitrate use of
the ring among the computers attached to the network.
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Figure 10.9 |
Popular wiring categories and typical uses for each. Category
5E is an enhanced version of category 5.
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Figure 13.2 |
A small WAN formed by interconnecting packet switches. Connections
between packet switches usually operate at a higher speed than connections
to individual computers.
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Figure 8.1 |
The independent point-to-point connections required for (a) two,
(b) three, and (c) four computers. The number of connections grows
rapidly as the number of computers increases.
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Figure 8.2 |
The disadvantage of a point-to-point network that requires a dedicated
connection for each pair of computers: the total number of connections
passing between two locations can exceed the total number of computers being
connected.
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Figure 8.3 |
Illustration of the star topology in which each computer attaches to
a central point called a hub.
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Figure 8.4 |
Illustration of a ring topology in which computers are connected in a
closed loop. Each computer connects directly to two others.
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Figure 8.5 |
Illustration of a bus topology in which all computers attach to a
single cable.
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Figure 8.7 |
Conceptual flow of bits across an Ethernet. While transmitting a
frame, a computer has exclusive use of the cable.
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Figure 8.8 |
Three computers with wireless LAN hardware positioned at maximal
transmission distance, d. Although computer 2 will receive
all transmissions, computers 1 and 3 will not receive
transmissions from each other
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Figure 8.9 |
The conceptual flow of bits during a transmission on a token ring
network. Except for the sender, computers on the network pass bits of the
frame to the next station. The destination makes a copy.
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Photo img1_030 |
Using star network topology requires that every computer have a separate
cable connecting it to the hub; there may be many cables running to the
hubs in a star-shaped network.
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