1. A source address is always ... a. a combination of Unicast and Broadcast b. Unicast c. broadcast d. none of the mentioned e. multicast 2. The different types of services provided by data link layer is/are ... a. acknowledged connectionless service b. unacknowledged connectionless service c. acknowledged connection oriented service d. all of the other answers 3. Internet works on ... a. two other answers are correct b. none of the mentioned c. digital subscriber line d. fiber distributed data interface e. circuit switching f. packet switching g. ethernet 4. in OSI model dialogue control and token management are responsibilities of ... a. transport layer b. application layer c. network layer d. session layer e. data link layer

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