Subject is data communication and computernetworking

a. Suppose we have Marketing, Accounts and HR departments and allthese departments are connected locally that is they are in onelocal area network. Now we want that HR department users can notdirectly access data of Accounts and Marketing departments andsimilary Marketing department user can not directly access HR andAccounts departments data. So in this case what will be the simpleand feasible solution and also write the names and role of thehardware devices use in thesolution.


b. Why Cyclic Redundancy Check (CRC) technique is used in the worldof networking? Also show the CRC calculation process at the senderend and the verification process at the receiver end for the givendata “10111010” by using Generator Ploynomial X4+X3+1.

Answer it wit details and examples also