Discussion
Arrange the following layers of OSI Model in the sequence in which they function :
(i) Network layer
(ii) Physical layer
(iii) Transport layer
(iv) Data link layer
Answer: C
The order is (ii), (iv), (i), (iii): Physical, Data link, Network, Transport.
In the OSI model the layers are numbered from the bottom: 1 Physical, 2 Data link, 3 Network, 4 Transport, 5 Session, 6 Presentation, 7 Application. Data being sent out pass down the layers and data being received pass up them, and the conventional numbering sequence starts from the Physical layer.
The other codes break this order: they put the Transport or Network layer first, or place the Physical layer after the Data link layer, which cannot be, since the Data link layer frames the bits the Physical layer carries.
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