41. A pure ALOHA network transmits 200 bit frames on a shared channel of 200 kbps . If the system with all stations together produces 1000 frames/s , the throughput is: (Assuming 𝑆 =0.135 (13.5%))
(a) 135 frames
(b) 140 frames
(c) 145 frames
(d) 150 frames
(b) 140 frames
(c) 145 frames
(d) 150 frames
Answer: (a)
42. A network using CSMA/CD has a bandwidth of 10 Mbps. If the maximum propagation time including the delays in the devices and ignoring the time needed to send a jamming signal is 25.6 𝜇s, the minimum size of the frame is:
(a) 256 bits
(b) 1024 bits
(c) 128 bits
(d) 512 bits
(a) 256 bits
(b) 1024 bits
(c) 128 bits
(d) 512 bits
Answer: (d)
43. The data rate of an STS-1 signal is:
(a) 155.52 Mbps
(b) 51.84 Mbps
(c) 100 Mbps
(d) 150 Mbps
(a) 155.52 Mbps
(b) 51.84 Mbps
(c) 100 Mbps
(d) 150 Mbps
Answer: (b)
44.
(a) 08 bytes
(b) 16 bytes
(c) 02 bytes
(d) 12 bytes
(b) 16 bytes
(c) 02 bytes
(d) 12 bytes
Answer: (d)
45. In a stop-and-Wait system, the bandwidth of the line is 1 Mbps , 1 bit takes 20 ms to make a round trip and the system data packets are 1000 bits in length. The bandwidth-delay product and the utilization of the link are:
(a) 10,000 bits and 5 %
(b) 20,000 bits and 10 %
(c) 10,000 bits and 10 %
(d) 20,000 bits and 5 %
(a) 10,000 bits and 5 %
(b) 20,000 bits and 10 %
(c) 10,000 bits and 10 %
(d) 20,000 bits and 5 %
Answer: (d)
46. The frequency 𝑓, peak-voltage amplitude 𝑉 and phase 𝜃 for the voltage waveform, 𝑣(𝑡)=6sin(2𝜋 10,000 𝑡 +30) are:
(a) 20 kHz ,6 volts and 45°
(b) 10 kHz ,6 volts and 30°
(c) 20 kHz ,3 volts and 30°
(d) 10 kHz ,3 volts and 45°
(a) 20 kHz ,6 volts and 45°
(b) 10 kHz ,6 volts and 30°
(c) 20 kHz ,3 volts and 30°
(d) 10 kHz ,3 volts and 45°
Answer: (b)
47. For a binary FSK signal with mark frequency of 49 kHz , space frequency of 51 kHz and an input bit rate of 2 kbps , the peak frequency deviation Δ𝑓, the minimum bandwidth 𝐵 and the baud, are:
(a) 3 kHz , 9 kHz and 1000
(b) 3 kHz , 9 kHz and 2000
(c) 1 kHz , 6 kHz and 2000
(d) 1 kHz , 6 kHz and 1000
(a) 3 kHz , 9 kHz and 1000
(b) 3 kHz , 9 kHz and 2000
(c) 1 kHz , 6 kHz and 2000
(d) 1 kHz , 6 kHz and 1000
Answer: (c)
48. What is the length of an ICMP data field for an Ethernet frame that is carrying an IP datagram with a 20 byte header, an ICMP message with a header length of 8 bytes and the Ethernet data field is 480 bytes long?
(a) 452 bytes
(b) 480 bytes
(c) 256 bytes
(d) 280 bytes
(a) 452 bytes
(b) 480 bytes
(c) 256 bytes
(d) 280 bytes
Answer: (a)
49. For a single-channel PCM system with sample rate 𝑓𝑠 = 6000 samples per second and 7 bit compressed PCM code, the line speed is:
(a) 42,000 bps
(b) 32,000 bps
(c) 22,000 bps
(d) 12,000 bps
(a) 42,000 bps
(b) 32,000 bps
(c) 22,000 bps
(d) 12,000 bps
Answer: (a)
50. For an UART receiving data at 1000 bps (f𝑏) with a receiver clock 16 times faster than the incoming data, the bit time, the receive clock rate and the maximum detection error are:
(a) 1 ms,8 kHz and 62.5 𝜇s
(b) 3 ms,8 kHz and 66.5 𝜇s
(c) 1 ms,16 kHz and 62.5 𝜇s
(d) 3 ms,16 kHz and 66.5 𝜇s
(a) 1 ms,8 kHz and 62.5 𝜇s
(b) 3 ms,8 kHz and 66.5 𝜇s
(c) 1 ms,16 kHz and 62.5 𝜇s
(d) 3 ms,16 kHz and 66.5 𝜇s
Answer: (c)
0 Comments
Post a Comment