A network administrator has been allocated the IPv4 10.10.240.0/20 block of addresses for a LAN. Two devices on two different, but contiguous, subnets on the LAN have been assigned the addresses 10.10.247.1/21 and 10.10.248.10/24, respectively. The administrator has to create a third subnet from the remaining address range. To optimize the use of this address space, the new subnet will follow on directly from the existing subnets. What is the first available host address in the next available subnet
Explanation: The complete address range of the subnet with the host 10.10.247.1/21 is 10.10.240.0/21 to 10.10.247.255/21. The complete address range of the subnet that contains the host 10.10.248.10/24 is 10.10.248.0/24 to 10.10.248.255/24. This means that the next subnet will have a network address of 10.10.249.0 with a prefix length between 24 and 30. The first useable host address on this new subnet is therefore 10.10.249.1.
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