What is the transmission time of a packet sent by a station if the length of the packet is 1 MB and the bandwidth of the channel is 200 Kbps? 

Solution:

To calculate the transmission time of a packet, we can use the formula:

Transmission Time = Packet Length / Bandwidth

In this case, the packet length is 1 MB, which is equivalent to 8 million bits (since 1 byte = 8 bits), and the bandwidth of the channel is 200 Kbps (200,000 bits per second).

So, substituting these values into the formula, we get:

Transmission Time = 8,000,000 bits / 200,000 bits per second

Simplifying this expression, we get:

Transmission Time = 40 seconds

Therefore, the transmission time of a packet sent by a station with a packet length of 1 MB and a channel bandwidth of 200 Kbps is 40 seconds.