Which one of the following switches uses store and forward transmission?a.Packet switchingb.None of the abovec.Circuit switchingd.Both a and b

Break Down the Problem

1. Identify the transmission methods mentioned: store and forward, packet switching, and circuit switching.
2. Determine which of the switching methods utilizes store and forward transmission.

Relevant Concepts

1. Store and Forward Transmission: This is a method where the switch receives the entire packet, stores it temporarily, and then forwards it to the destination.
2. Packet Switching: Involves breaking down data into packets which are sent independently over the network.
3. Circuit Switching: A method where a dedicated communication path is established between two parties for the duration of the communication.

Analysis and Detail

1. Packet switching uses store and forward mechanisms since packets can be buffered at switches until the entire packet is received.
2. Circuit switching does not use store and forward; it sets up a dedicated communication path before any data is transmitted.
3. "None of the above" implies that none of the options involve store and forward, which is incorrect because packet switching does.

Verify and Summarize

• Packet switching does use store and forward transmission.
• Circuit switching does not involve this mechanism.
• The option "None of the above" is also incorrect since packet switching is a valid option.

Final Answer

a. Packet switching uses store and forward transmission.