Basic Approaches

1. Stop and Wait

<aside> 📖 Basic algorithm

At most one packet in flight at any time

1. Sender sends one packet
2. Receiver sends acknowledgment packet when it receives data
3. On receiving acknowledgment, sender sends new data
4. On timeout, sender resends current data </aside>

<aside> 📖 Duplicates

• Use 1-bit counter in data and acknowledgments
• Some simplifying assumptions </aside>