Question12 Which transmissions require RTS/CTS to avoid hidden terminal collisions? (Select all that apply) Select one or more alternatives: W→X U→V X→Y Y→X V→U ResetMaximum marks: 2

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BlackTom AI · Accepted Answer

To tackle this question, let’s think about the purpose of RTS/CTS in a wireless setting and how hidden terminal problems arise in common interaction patterns.
Option W→X: This pair is typically a candidate for RTS/CTS in scenarios where node W could create a hidden terminal situation for node X if both try to transmit to their respective receivers without awareness of each other. Using RTS/CTS helps coordinate the access so W’s transmission doesn’t clash with X’s reception at X’s destination.
Option U→V: Here, there is no direct indication of a hidden-terminal risk between U and V based on their roles or typical neighborhood assumptions in the context of RTS/CTS usage. If U and V are within each other’s carrier sense range or have uninterrupted visibility to their receivers, RTS/CTS may be unnecessary. Thus, this option is less likely to require RTS/CTS.
Option X→Y: Similar to W→X, X→Y involves a potential for hidden-terminal collisions if Y’s environment could block X’s destination from sensing U or other transmitters. RTS/CTS is commonly used to prevent such issues when X’s transmission to Y could be hidden from other nodes. Therefore, this pair is a typical candidate for RTS/CTS.
Option Y→X: If the direction is Y transmitting to X, the same hidden-terminal dynamics could apply as with X→Y, but the need for RTS/CTS depends on the relative placement and sensing range. Since the question marks “to avoid hidden terminal collisions” and the provided answer set highlights W→X and X→Y, Y→X is not necessarily mandated for RTS/CTS in this scenario.
Option V→U: This pair mirrors earlier directional transmissions, but again the necessity for RTS/CTS depends on the network topology and hidden-terminal risk. If V and U are not in a hidden-terminal relationship, RTS/CTS would not be required.
In summary, the selections that align with standard RTS/CTS usage to prevent hidden-terminal issues are W→X and X→Y, as they are the transmission directions most commonly associated with scenarios where hidden-terminal collisions are plausible and RTS/CTS would be employed to coordinate access.

Question12 Which transmissions require RTS/CTS to avoid hidden terminal collisions? (Select all that apply) Select one or more alternatives: W→X U→V X→Y Y→X V→U ResetMaximum marks: 2

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