Hi sir. I'm studying previous questions to prepare for the exam. Please answer all questions so I know how to solve later. Thanks 

1. Convert the following IP address in CIDR Slash notation into subnet mask notation: [20 marks] (Show your works). a. 10.128.15.10/21. b. 224.10.10.10/29. 2. Convert the following IP address in subnet mask notation into CIDR Slash notation [20 marks] (Show your works). a. 10.10.100.100255.255.254.0. . 192.192.10.10255.255.255.128. 3. For the given IP address 210.1.1.10/19, find: [30 marks] a. the first address in the network (The network address) b. the last address in the block (The broadcast address) c. the range of usable addresses (host addresses) 4. For the given IP address 210.1.1.10/27, find: [30 marks] a. the first address in the network (The network address) b. the last address in the block (The broadcast address) c. the range of usable addresses (host addresses)