A workstation is configured with the following network details: Software on the workstation needs to send a query to the local subnet broadcast address. To which of the following addresses should the software be configured to send the query?
CIDR 27 is 1111 1111.1111 1111.1111 1111.1110 0000
2^5 = 32 hosts per subnet
1st address is network address, last address is broadcast address
The user address is 10.1.2.23 which means he reside in the network of 10.1.2.0 to 10.1.2.31
10.1.2.31 is the last address in that network thus the broadcast address
Thanks for the link. Can someone explain how the first subnet is 10.1.2.0 - 10.1.2.31 if the default gateway is 10.1.2.1? Is that an error? I feel like the default gateway should be 10.1.2.0
You should do the subnetting chapters properly. 10.1.2.0 is the network Id. That is not an assignable IP address. Default gateway is an IP address in the same network and it cannot be the network Id.
/27 is 255.255.255.224
256-224=32
The subnets go up by 32
10.1.2.0-10.1.2.31 is the first subnet, the first and last addresses are unusable and reserved for broadcast address
Don't make it complex. The first 3 bits of the last octet is used for the subnet leaving 5 bits for the host portion. So it could be from 0-31, 32-63, 64- 95, etc 2^3 = 8 subnets like that. Luckily only have to look at the first. and last in that range (31) is the broadcast (first is the network id).
/27 have 32 addresses per subnet
1st subnet start with 10.1.2.0 - 10.1.2.31
2nd subnet start with 10.1.2.32 - 10.1.2.63
3rd subnet start with 10.1.2.64 - 10.1.2.95
And so on.
IP address 10.1.2.23 is in the 1st subnet. So, broadcast address is 10.1.2.31
If I understand this correctly, the x.x.x.0 is the network id for this first subnet (the one that the workstation is on), and is not used for hosts. The x.x.x.31 is the broadcast id; also not used for hosts. The default gateway is often, but does NOT have to be, the first AVAILABLE host of the subnet (which in this case is x.x.x.1)
Thanks for this explanation, I was confused as well.
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