Answer:
172.16.123.244 255.255.255.252
Step-by-step explanation:
Subnet mask is a 32-bit number that separates the IP address into network part and host part.
Subnet 172.16.123.244 /30 receives the packet
Block size : 2^(32-30)=4
Number of IP: 4
Number of Useable Hosts: 2
The remaining 2 for broadcast and network address
Network Address: 172.16.123.244
Broadcast Address: 172.16.123.247