PREVIOUS YEAR SOLVED PAPERS - December 2015 Paper 2
21. Which of the following services is not provided by wireless access point in 802.11 WLAN ?
- Option : C
- Explanation : Services provided by wireless access point in 802.11 WLAN:
- Integration
- Disassociation
- Association
For error correction we have different policies, and correction does not provided by wireless access point in 802.11 WLAN. So, option (C) is correct.
22. Which of the following fields in IPV4 datagram is not related to fragmentation?
- Option : A
- Explanation : Type of service is not related to IPV4 datagram. While flags , identification and fragmentation offset are related to IPV4 datagram. So, option (A) is correct.
- Option : D
- Explanation : The multiplexer is shown in the Figure.
Each frame carries 1 byte from each channel; the size of each frame, therefore, is 4bytes, or 32 bits. Because each channel is sending 100 bytes/s and a frame carries 1 byte from each channel, the frame rate must be 100 frames per second. The bit rate is 100 × 32 = 3200 bps.
- Option : A
- Explanation :
Each cell has six other adjacent cells, in a hexagonal grid. If the central cell uses frequency group A, its six adjacent cells can use B, C, B, C, B, and C respectively. In other words, only 3 unique cells are needed. So the answer is 840/3 = 280 frequencies.
- Option : A
- Explanation : p = 3, q = 13, d = 7, e = 3, M = 5, C = ? C = Me mod n n = p * q = 3 * 13 = 39 C = 53 mod 39 = 8 So, option (A) is correct.
