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There are three forms of dialog.

  • Simplex Dialogs - One way transfers, similar to an old computer/printer. Data could be sent to the printer but the printer could not communicate back.

  • Half-Duplex Dialogs - Two-way transfers. Each device must take their turn. Both cannot transfer at the same time.

  • Full-Duplex Dialogs - Two-way simultaneous data transfers. Each device has it's own channel. Telephones are full duplex, as are most modems. Full duplex is the most expensive to implement.

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Q: What are the different types of dialogs in Session layer?
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