4. TCP belongs to which Layer with respect to the TCP/IP Protocol suite? a. Application Layer b. Network Layer c. Transport Layer d. Network Access Layer 5. What is the first valid host address on the subnet that host 196.168.15.50/26 belongs to? a: 196.168.15.1 b. 196.168.15.0 c. 196.168.15.255 d. 196.168.15.36