Page 8 of 11 7. An ISP has a CIDR block 71.94.128.0/17 (01000111 01011110 10000000 00000000). The ISP wants to sub-divide this into 4 smaller CIDR blocks (all of the same size) for its customers. a. How many bits should the ISP add to the mask to identify the subnets? b. What are the addresses of each smaller block in binary? 38. An ISP is granted the block 204.15.176.0/20. The ISP need to allocate one subblock to support 50 addresses and 1 subblock to support 25 addresses. a. How many bits of host id are required for the block of 50 addresses? b. What is the address in binary for the last address in the block allocated for 50 addresses? The first address of this block of addresses in binary is 204.15.176.0 11001100.00001111.10110000.00000000 c. How many bits of host id are required for the block of 25 addresses? d. What is the first address (in either binary or dotted decimal) for the block of 25