What is the percentage of over head on a T1 carrier (1.544 Mbps) ?
| A. | 25% |
| B. | 13% |
| C. | 20% |
| D. | 47% |
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Option: B Explanation : Click on Discuss to view users comments. |
A noiseless 3 kHz channel transmits bits with binary level signals. What is the maximum data rate ?
| A. | 3 kbps |
| B. | 6 kbps |
| C. | 12 kbps |
| D. | 24 kbps |
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Option: B Explanation : Click on Discuss to view users comments. |
Given an infinite amount of buffer space. In the text it was stated that a satellite with two uplink and one downlink slotted ALOHA channels can achieve a downlink utilization of
| A. | 0.536 |
| B. | 0.636 |
| C. | 0.736 |
| D. | 0.936 |
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Option: C Explanation :
The probability of success (i.e. exactly one frame in a slot) = 1 / e ~ 0.368. Click on Discuss to view users comments. |
In time division switches, if each memory access takes 100 ns and one frame period is 125ms, then maximum number of lines that can be supported is
| A. | 625 |
| B. | 1250 |
| C. | 2300 |
| D. | 318 |
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Option: A Explanation : In time division switches 2nT = 1 frame period, where T = memory access time. Click on Discuss to view users comments. |
A bridge has access to which address of a station on the same network ?
| A. | Physical |
| B. | Network |
| C. | Service access point |
| D. | All of these |
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Option: A Explanation : A bridge operates at the data link layer, giving it access to the physical address of all stations connected to it. Answer is physical addresses. Click on Discuss to view users comments. |
