·
A distributed system is a
o
collection
of
physically separate, possibly heterogeneous
computer systems
o
that are networked
o
to provide the users with access to the various resources that
the system maintains.
·
Some O.S – treats n/w access as general
file access (by keeping n/w related details in n/w interface’s device driver).
·
Other O.S – make users to call (or)
invoke n/w functions.
·
systems contain a mix of the two modes—for
example FTP & NFS.
·
What is Network and its protocols.
Generally TCP/IP , ATM are used.
· To
an operating system, a network protocol simply needs an interface
device—a network adapter.
·
Types
of n/w – LAN(same building or floor), WAN(2 buildings,
cities or countries) & MAN (buildings within a city), Small-Area N/w -
Bluetooth&802.11 (uses wireless comm.. for few feet distance).
·
N/W
Media - copper wires, fiber strands, and wireless
transmissions between satellites, microwave dishes, and radios.
·
Network
operating system –
o
features
§
file sharing across the network and
§
communication scheme that allows
different processes on different computers to exchange messages.
§
Each Computer runs autonomously but
provides the illusion that only a single operating system controls the network.
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