An application real-time uses the network depicted at Figure 2. The server sends

ID: 3718770 • Letter: A

Question

An application real-time uses the network depicted at Figure 2. The server sends a video to the client in real-time. To have a good quality of service (QoS), the client must receive 25 images per second. Suppose that an image is 10 Kbytes and UDP is used. The network can’t send a 10 Kbytes packet, so the image will be fragmented is smaller packets. The control information added to each packet is 100 bytes.

a. If the packet’s size is 1-Kbyte plus 100 bytes control information, is it possible for the server to send the video? Explain you answer.

b. If the packet’s size is 1-byte plus 100 bytes control information, is it possible for the server to send the video? Explain you answer.

R2 R3 10Mbps R1 100 Mbps 10 Mbps 100 Mbps Server Client

Explanation / Answer

Absolutely, 1 Kbytes and 100 bytes will become 1100 bytes and in bits it will be 8800 bits

8800 bits is for one image

for 25 images 25*8800 = 220000 = 0.2 Mbps

which is very much possible to sent through the bottleneck of the network which is 10 Mbps

Here there will be the overhead of control information because for every 1 byte 100 bytes of control information doesn't make sense,

10 for 10 Kbytes of an image we have to send 100*10 K 1M bytes of information

which means 8 M bits, for 1 image

and for 25 images it requires 25*8 = 200 Mbps not possible

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