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1.5. Exercises
1. We transmit data directly between two servers 6,000 km apart through a geostationary satellite situated 10,000 km from Earth exactly between the two servers. The data enters this network at 100 Mb/s.

Find the propagation delay if data travels at the speed of light (2.3 x 108 m/s).

Find the number of bits in transit during the propagation delay.

Determine how long it takes to send 10 bytes of data and to receive 2.5 bytes of acknowledgment back.

2. Repeat exercise 1, but this time, suppose that the two servers are 60 meters apart on the same campus.

3. Stored on a CD-ROM is a 200 MB message to be transmitted by an e-mail from one mail server to another, passing three nodes of a connectionless network. This network forces packets to be of size 10 KB, including a packet header of 40 bytes. Nodes are 400 miles apart, and servers are 50 miles away from their corresponding nodes. All transmission links are of type 100 Mb/s. The processing time at each node is 0.2 seconds per packet.

Find the propagation delays per packet between a server and a node and between nodes.

Find the total time required to send this message.

4. Equation 1.2 gives the total delay time for connection-oriented networks. Let tp be the packet-propagation delay between each two nodes, tf1 be the data packet transfer time to the next node, and tr1 be the data packet processing time. Also, let tf2 be the control-packet transfer time to the next node, and tr2 be the control-packet processing time. Give an expression for D in terms of all these variables.

5. Suppose that a 200 MB message stored on a CD-ROM is to be uploaded on a destination through a virtual-circuit packet-switched network. This network forces packets to be of size 10 KB, including a packet header of 40 bytes. Nodes are 400 miles apart, and servers are 50 miles away from their corresponding nodes. All transmission links are of type 100 Mb/s. The processing time at each node is 0.2 seconds per packet. For this purpose, the signaling packet is 500 bit long.

Find the total connection request/accept process time.

Find the total connection release process time.

Find the total time required to send this message.