An IP router implementing Classless Inter-domain Routing (CIDR) receives a packet with address $128.96.39.10.$ The router's routing table has the following entries: $$ \begin{array}{|c|c|} \hline \textbf{Subnet Number} & \textbf{Output Interface Identifier} \\ \hline 128.96 .39 .0 / 25 & \text{R}2 \\ \hline 128.96 .39 .0 / 27 & \text{R}3 \\ \hline 128.96 .40 .0 / 25 & \text{R}4 \\ \hline 192.4 .153 .0 / 26 & \text{R}5 \\ \hline \text{(default)} & \text{R}6 \\ \hline \end{array} $$ The identifier of the output interface on which this packet will be forwarded is __________.
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All India Mock Test 4 - Solutions Part 1
given 128.96.39.0 00 01010
R2
128.96.39.0 0000000
255.255.255.1 0000000
R3
128.96.39.000 00000
255.255.255.111 00000
R2 and R3 are matching R3 being the longer one it will be selected
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Computer Networks, Fifth Editionby David J. Wetherall, Andrew S. Tanenbaum
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