What is the possible IP range that can be assigned to hosts on a subnet that includes the address
192.168.144.34/29?
A.
192.168.144.32 – 192.168.144.63
B.
192.168.144.33 – 192.168.144.38
C.
192.168.144.33 – 192.168.144.48
D.
192.168.144.28 – 192.168.144.40
Explanation:
Range 192.168.144.33 – 192.168.144.38 is the correct answer. To determine the range of addresses that can
be assigned in a subnet, you must first determine the network ID of the subnetwork and the broadcast address
of the subnetwork. All addresses that can be assigned to hosts will lie between these endpoints. The network
ID can be obtained by determining the interval between subnet IDs. With a 29-bit mask, the decimal equivalent
of the mask will be 255.255.255.248. The interval between subnets can be derived by subtracting the value of
the last octet of the mask from 256. In this case, that operation would be 256 – 248 = 8. Therefore, the interval
is 8.
The first network ID will always be the classful network you started with (in this case 192.168.144.0). Each
subnetwork ID will fall at 8-bit intervals as follows:
192.168.114.0
192.168.144.8
192.168.144.16
192.168.144.24
192.168.144.32
192.168.144.40
We can stop at the 192.168.144.40 address because the address given in the scenario, 192.168.144.34, is in
the network with a subnet ID of 192.168.144.32. Therefore, since the broadcast address for this network will be
1 less than the next subnet ID (192.168.144.39), the valid range of IP addresses is 192.168.144.33 –
192.168.144.38. 192.168.144.39 will be the broadcast address for the next subnet, and 192.168.144.40 will be
the first valid address in the next subnet.
None of the other answers is the correct range.
Objective:
Network Fundamentals
Sub-Objective:
Apply troubleshooting methodologies to resolve problemsCisco > Technology Support > IP > IP Routing > Design TechNotes > IP Addressing and Subnetting for New
Users > Document ID: 13788 > Understanding IP Addresses