Functions of OSI and TCP/IP Layers Q.21

21Host X has IP address 192.168.1.97 and is connected through two routers R1 and R2 to another host Y with IP address 192.168.1.80. Router R1 has IP addresses 192.168.1.135 and 192.168.1.110. R2 has IP addresses 192.168.1.67 and 192.168.1.155. The netmask used in the network is 255.255.255.224.
Given the information above, how many distinct subnets are guaranteed to already exist in the network

Option : C
Explanation : Given IP addresses are of Class C
default Mask for class C = 24
The given mask is 11 bits 11111111 11111111 11111111 11100000
subnet ID: 3 bits
existing subnets: 011, 010 and 100

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