Computer Network
Q51.
Consider two hosts X and Y, connected by a single direct link of rate 10^{6} bits/sec . The distance between the two hosts is 10,000 km and the propagation speed along the link is 2x10^{8} m/sec . Host X sends a file of 50,000 bytes as one large message to host Y continuously. Let the transmission and propagation delays be p milliseconds and q milliseconds, respectively . Then the values of p and q areQ52.
A certain population of ALOHA users manages to generate 70 request/sec. If the time is slotted in units of 50 msec, then channel load would beQ54.
A network has a data transmission bandwidth of 20 \times 10^{6} bits per second. It uses CSMA/CD in the MAClayer. The maximum signal propagation time from one node to another node is 40 microseconds. The minimum size of a frame in the network is ______ bytes.Q55.
A sender uses the Stop-and Wait ARQ protocol for reliable transmission of frames. Frames are of size 1000bytes and the transmission rate at the sender is 80Kbps(1Kbps=1000 bits/second). Size of anacknowledgement is 100bytes and the transmission rate at the receiver is 8Kbps. The one-way propagation delay is 100milliseconds. Assuming no frame is lost, the sender throughput is _____bytes/second.Q56.
In CRC if the data unit is 100111001 and the divisor is 1011 then what is dividend at the receiver?Q57.
A link has a transmission speed of 10^{6} bits/sec. It uses data packets of size 1000 bytes each. Assume that the acknowledgment has negligible transmission delay, and that its propagation delay is the same as the data propagation delay. Also assume that the processing delays at nodes are negligible. The efficiency of the stop-and-wait protocol in this setup is exactly 25%. The value of the one-way propagation delay (in milliseconds) is ________.Q58.
If the frame to be transmitted is 1101011011 and the CRC polynomial to be used for generating checksum is x^{4}+x+1, than what is the transmitted frame?