Answer provides the procedure to find the network address when a packet with destination IP(
198.51.100.223/21) is reached at a router.
But a network packet has the destination IP
198.51.100.223 in the IP packet but does not include
/21. Router looks up the table of network prefixes with subnet mask(for ex:
Given a packet with destination IP(
198.51.100.223) receiving at a router, How does a router determine its network address? to route the packet accordingly...