hi mohit,
of course it does support networking but that depends
on the package u got.
assigning a=b could be legal depending on
the structure type u declare.
as to data types :
the data type has the fastest access to variables
since it Directly addresses internal data memory.
the idata type variable allows u to access all
the 256bytes of internal memoy.
the bdata Bit-addressable internal data memory,
it offers both bit and byte access.
the xdata type accesse upto (64 KBytes) of
external memory with the MOVX @DPTR.
the pdata type is similar except that
it allows access to a full page of 256 bytes of
external memory: same effect as using MOVX @Rn
in assembly opcode.

now obviously u're a beginner, i can assist u with
some help from time to time.

happy programming!
mourad