Suppose P, Q and R are ISPs with respective CIDR address blocks (with bytes in decimal) 51.0.0.0/8, 52.0.0.0/8 and 53.0.0.0/8. P then has customers A and B, to which it assigns address blocks as follows:
A: 51.10.0.0/16
B: 51.23.0.0/16
C: 52.14.0.0/16
D: 52.15.0.0/16
Q has customers C and D and assigns them address blocks as follows:(a).♢ Give forwarding tables for P, Q and R assuming they connect to each other and to each of their own customers.
(b). Now suppose A switches from provider P to provider Q, and takes its address block with it. Give the changes to the forwarding tables for P, Q and R; the longest-match rule will be needed to resolve conflicts.

Address blocks as 52.14.0.0/16, IP addresses come in static and dynamic varieties .The words IPv4 and IPv6 refer to Internet Protocol versions 4 and 6, respectively.

To whom are IP address blocks assigned?

The Internet Assigned Numbers Authority (IANA) and five regional Internet registries (RIRs) are in charge of managing the IP address space on a global scale and are in charge of assigning IP addresses to local Internet registries, such as Internet service providers (ISPs) and other end users, in their respective regions.
IP addresses come in static and dynamic varieties.
The words IPv4 and IPv6 refer to Internet Protocol versions 4 and 6, respectively. IPv6 is the newest version of Internet Protocol and is far more efficient and sophisticated than IPv4. Difference IPv4 and IPv6 are the two options. The address length for IPv4 is 32 bits.

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