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# Chapter03 - work of 2500 meters to work properly The...

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1 CHAPTER 3 Underlying Technologies Exercises 1. The Ethernet frame must have a minimum data size because a sending station must be able to sense a collision before the entire frame is sent out. The minimum size of an Ethernet network is therefore determined by the minimum frame size. 3. In the worst case, the collision would be sensed in 2 × 12.5 = 25 microseconds. 5. Let X equal the minimum number of bits. Then, X bits / 10,000,000 bits/second = 0.000025 seconds X = 10,000,000 × 0.000025 = 250 bits 250 bits / 8 = 31.25 bytes The minimum frame size would have to be larger than 32 bytes for an Ethernet net-

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Unformatted text preview: work of 2500 meters to work properly. The minimum size is set to 65 bytes to allow for propagation delay in the connecting devices. 7. No, the data cannot be encapsulated in one frame. Two frames need to be sent. One frame has 1500 bytes of data; the other has 10 bytes of data plus 36 bytes of pad-ding. SECTION 2 9. See Table 3.1. Table 3.1 Exercise 9 Fields IEEE 802.3 IEEE 802.11 Destination address 6 Source address 6 Address 1 6 Address 2 6 Address 3 6 Address 4 6 FC 2 D/ID 2 SC 2 PDU length 2 Data and padding 1500 Frame body 2312 FCS (CRC) 4 4...
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• Winter '10
• Dmathur
• Institute of Electrical and Electronics Engineers, media access control, IEEE 802, IEEE 802.3, Minimum Frame Size

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