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CCENT & ICND1 Question:

What is the last host address for subnet 172.16.96.0 with mask 255.255.224.0?

A) 172.16.192.255

B) 172.16.159.254

C) 172.16.223.254

D) 172.16.255.254

E) 172.16.223.255

F) 172.16.127.254


Answer: F
For network 172.16.96.9 255.255.224.0:

When put in binary:

Network: 172.16.01100000.00000000
Mask: 255.255.11100000.00000000


To work out the last host address, put 1's in the host portion, except for the last bit which should be set to 0.

Network: 172.16.01100000.00000000
Mask: 255.255.11100000.00000000
Last Host: 172.16.01111111.11111110

Thus the last host address is: 172.16.127.254


To your success,
David Bombal
CCIE #11023, CCSI, CCDP,CCIP, CCNP, CCSP, CCVP
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