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Subnetting

Last response: in Networking
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March 10, 2010 5:34:12 AM

Please answer this question,

Routers are configured on a subnetted network with IP Addresses of 215.34.23.34, 215.34.23.68 and 215.34.23.140. A subnet mask of 255.255.255.224 is in use, the following exist

HostP IP Address 215.34.23.32, default gateway 215.34.23.34

HostQ IP Address 215.34.23.62, default gateway 215.34.23.74

HostR IP Address 215.34.23.92, default gateway 215.34.23.68

HostS IP Address 215.34.23.130, default gateway 215.34.23.68

Host T IP Address 215.34.23.92, default gateway 215.34.23.140

Which one of the following connections will fail?



a) HostQ with HostT b) HostS with HostR c) HostP with HostS d) HostR with HostT

More about : subnetting

March 10, 2010 4:12:45 PM

224 translates into 1110 0000 in binary

this means all IPs will be based on the last 5 or 1 1111 which is 31 in decimal. This means subnets will be in increments of 31. 0-31 is one subnet, 32- 63 is another etc etc

0-31
32-63
64-95
96-127
128-159
160-191
192-223
224-255

My guess would be B

if anyone tries to send a datagram to 215.34.23.130, the 215.34.23.140 gateway. But because that host is setup with 215.34.23.68, it would never receive it, assuming each subnet is in its own broadcast domain.

GL with your homework. Best you actually understand subnets. They're easy once you see the pattern.
March 10, 2010 4:49:30 PM

:bounce:  Thanks for the Suggestions
March 16, 2010 10:10:19 PM

All of these connections will fail:

A won't work because Host T has a gateway assigned in a different subnet
B won't work because Host S has a gateway assigned in a different subnet
C won't work because Host P is using a network address and Host S has a gateway assigned in a different subnet
D won't work Host R and Host T are using the same IP address and Host T has a gateway assigned in a different subnet

But like Kewl suggested, it would behoove you to understand subnetting.
!