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• Ethernet (IEEE 802.3
standard)
• Token Bus (IEEE 802.4 LAN
standard)
• Token Ring (IEEE 802.5 LAN
standard) and FDDI
This chapter deals in detail
about the above technologies.
LAN structure
• defines the structure of
the network
• contains both physical topology,
which is the actual layout of the wire (media)
[bus, star, ring, extended star,
hierarchical, mesh] and the logical topology, which
defines how the media is accessed
by the hosts [token passing]
Examples
The above figure shows how the
hosts can be connected using any wiring media. This is called the bus topology.
The circle depicts the nodes. They all share the same media. This is the
simplest of all and easy to implement. Cost is less. Used in LAN. But only one communication
can happen at a time.
This is the ring topology the
hosts are connected in a ring fashion and uses a special packet called token
for the communication between the hosts. The ring maintenance is a important
issue not as simple as bus to implement
The above figure shows the star
topology. There is a wiring hub to which the hosts are connected. The data
passes through the hub in the center. This is a very popular structure used in
the LAN. The wiring hub can be a network device switch. The extended star also is
used. When all the nodes are connected to each other by the wiring media it
becomes the MESH topology.
The nodes are connected like a
tree structure.
Satellite
– nodes use an antenna to send
and receive data
– point-to-point from land based
antenna to satellite
– broadcast from the satellite to one or more ground
stations
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