Match List-I and List-II: \(\begin{array}{llll} & \text{List I} && \text{List…
2019
Match List-I and List-II:
\(\begin{array}{llll} & \text{List I} && \text{List II} \\ \text{(a)} & \text{Physical layer} & \text{(i)} & \text{Provide token management service} \\ \text{(b)}& \text{Transport layer} & \text{(ii)}& \text{Concerned with transmitting raw bits} \\ &&& \text{over a communication channel} \\ \text{(c)} & \text{Session Layer} & \text{(iii)} & \text{Concerned with the syntax and} \\ &&& \text{semantics of the information transmitted} \\ \text{(d)}& \text{Presentation layer} & \text{(iv)} & \text{True end-to-end layer from source to} \\ &&& \text{destination} \\ \end{array}\)
Choose the correct option from those given below:
- A.
\((a)-(ii), (b)-(iv), (c) -(iii), (d)-(i) \) - B.
\((a)-(iv), (b)-(iii), (c) -(ii), (d)-(i) \) - C.
\((a)-(ii), (b)-(iv), (c) -(i), (d)-(iii) \) - D.
\((a)-(iv), (b)-(ii), (c) -(i), (d)-(iii)\)
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Correct answer: C
Final matching (correct answer): Physical layer → Concerned with transmitting raw bits over a communication channel; Transport layer → True end-to-end layer from source to destination; Session layer → Provide token management service; Presentation layer → Concerned with the syntax and semantics of the information transmitted.
Physical layer: handles the transmission of raw bit streams across the physical medium, so it matches the description about transmitting raw bits.
Transport layer: provides end-to-end communication services for applications, making it the true end-to-end layer from source to destination.
Session layer: responsible for dialog control and token management between systems, so it matches the token management description.
Presentation layer: deals with data representation, syntax and semantics, encryption and compression, so it matches the description about syntax and semantics of the information transmitted.
Tip: A quick way to remember key OSI roles: Physical = bits, Data Link = frames, Network = routing, Transport = end-to-end, Session = dialog/token management, Presentation = data format (syntax/semantics), Application = user services.
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