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Functions of OSI and TCP/IP Layers Q.67

0. Assume that the bandwidth for a TCP connection is 1048560 bits/sec. Let α be the value of RTT in milliseconds (rounded off to the nearest integer) after which the TCP window scale option is needed. Let β be the maximum possible window size with window scale option. Then the values of α and β are

  • Option : C
  • Explanation : (1) we have bandwidth delay product
    = (1048560/8) B * α = 64 K
    α = (64 K * 8 )/1048560
    = 0.5s = 500 milliseconds.
    (2) If window scaling happens, a 14 bit shift count is used in TCP header. So, the maximum possible window size gets increased from 216 – 1 to (216 – 1) * 214 or from 65535 to 65535 * 214
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