Explain atleast four differences between OSI & TCP?IP
model?
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Answer Posted / lalitha
The main differences between the two models are as follows:
1.OSI is a reference model and TCP/IP is an implementation
of OSI model.
2.TCP/IP Protocols are considered to be standards around
which the internet has developed. The OSI model however is
a "generic, protocol-independent standard."
3.TCP/IP combines the presentation and session layer issues
into its application layer.
4.TCP/IP combines the OSI data link and physical layers into
the network access layer.
5.TCP/IP appears to be a simpler model and this is mainly
due to the fact that it has fewer layers.
6.TCP/IP is considered to be a more credible model- This is
mainly due to the fact because TCP/IP protocols are the
standards around which the internet was developed therefore
it mainly gains creditability due to this reason. Where as
in contrast networks are not usually built around the OSI
model as it is merely used as a guidance tool.
7.The OSI model consists of 7 architectural layers whereas
the TCP/IP only has 4 layers.
8.In the TCP/IP model of the Internet, protocols are
deliberately not as rigidly designed into strict layers as
the OSI model.[6] RFC 3439 contains a section entitled
"Layering considered harmful." However, TCP/IP does
recognize four broad layers of functionality which are
derived from the operating scope of their contained
protocols, namely the scope of the software application, the
end-to-end transport connection, the internetworking range,
and lastly the scope of the direct links to other nodes on
the local network.
9.The presumably strict consumer/producer layering of OSI as
it is usually described does not present contradictions in
TCP/IP, as it is permissible that protocol usage does not
follow the hierarchy implied in a layered model. Such
examples exist in some routing protocols (e.g., OSPF), or in
the description of tunneling protocols, which provide a Link
Layer for an application, although the tunnel host protocol
may well be a Transport or even an Application Layer
protocol in its own right.
10.The TCP/IP design generally favors decisions based on
simplicity, efficiency and ease of implementation.
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