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.
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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.
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4. | Equation 1.2 gives the total delay time for connection-oriented networks. Let t p be the packet-propagation delay between each two nodes, t f 1 be the data packet transfer time to the next node, and t r 1 be the data packet processing time. Also, let t f 2 be the control-packet transfer time to the next node, and t r 2 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.
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6. | We want to deliver a 12 KB message by uploading it in the destination's Web site through a 10-node path of a virtual-circuit packet-switched network . For this purpose, the signaling packet is 500 bits long. The network forces packets to be of size 10 KB including a packet header of 40 bytes. Nodes are 500 miles apart. All transmission links are of type 1 Gb/s. The processing time at each node is 100 ms per packet and the propagation speed is 2.3 x 10 8 m/s.
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7. | To analyze the transmission of a 10,000-bit-long packet, we want the percentage of link utilization used by the data portion of a packet to be 72 percent. We also want the ratio of the packet header, h , to packet data, d , to be 0.04. The transmission link speed is s = 100 Mb/s.
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8. | Consider a digital link with a maximum capacity of s = 100 Mb/s facing a situation resulting in 80 percent utilization. Equal-size packets arrive at 8,000 packets per second. The link utilization dedicated to headers of packets is 0.8 percent.
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9. | Develop a signaling delay chart, similar to Figures 1.7 and 1.8, for circuit-switched networks. From required steps, get an idea that would result in the establishment of a telephone call over circuit-switched networks. |
10. | In practice, the optimum size of a packet estimated in Equation (1.7) depends on several other contributing factors.
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