L1 Data Link Layer | Numerical problems and solutions

This video is about computer network osi layer data link layer. 1. A channel has a bit rate of 4 kbps and a propagation delay of 20 msec. For what range of frame sizes does stop-and-wait give an efficiency of at least 50%? 2. A 3000-km-long T1 trunk is used to transmit 64-byte frames using protocol 5. If the propagation speed is 6 μsec/km, how many bits should the sequence numbers be? For more videos on computer science like this subscribe to this channel.