Data communication And Computer networks

hi students here i am posting your DCCN Text book 4th edition of Behrouz A Forouzan.
 slides of the subject and material also.



all the best for ur seminars and mid exams

click on this site :--  
http://books.google.com/books?id=6HaNKmfBK1oC&lpg=PP1&pg=PA48#v=onepage&q&f=false