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3 . ( a ) Differentiate between a hub, a switch, and a router in computer networks. At which level of the OSI model do
a Differentiate between a hub, a switch, and a router in computer
networks. At which level of the OSI model do they each operate?
b What function is provided by the Transmission Control Protocol
TCP ports? Briefly describe a situation in which TCP ports might
be of use and how the purpose of a given port on a remote machine
is decided.
c With the aid of a diagram, explain what is meant by the hidden
terminal problem in a wireless network. Outline one technique for
solving it
d Writing a program in assembly language is presumably more
difficult than writing a program in a highlevel language. Give two
reasons which justify the above statement and explain why assembly
language is still used to program some applications.
e Use the relation CUSTOMER, given below, to write an SQL query
that lists the customers name and city for all customers that are
located in either Liverpool or Cardiff.
CUSTNUMBER CUSTNAME CITY
Merci Lyndon Manchester
Andrew Santiago London
Arnie Staples Cardiff
Maria Stones StokeonTrent
Ibrahim Safari Liverpool
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