Marks) Answer the following 2 - A research centre sends the following message to its director three times per second, the secrete Question No. 1:- formula is E = mc2". Calculate the capacity of its information source. b)- Define the network layer of the OSI model that are; |- The network support layers, ii- Provides access for the end user, iii- Achieve Route selection, iv- Transmit a bit stream across a transmission medium. [10 Marks] Question No. 2:- a- Define some of the main network requirements, b- Why does a circuit-switched network need end-to-end addressing during the setup phase, and no c- Why does a datagram network need only end-to-end addressing during the data transfer phase. are needed during the data transfer , 116 Man