Official Lammle User Forum
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#1
11-25-2007, 10:48 PM
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Is this a typo
Hello all,
I am reading Todd's book CCNA Study Guide 6th edition for exam 640-802 I got confused because on page 97, in the section titled "Class A Valid Host IDs" it says the following : " Notice that 0s and 255s can be valid host IDs" but then it continues to say " .... the host IDs can't all be turned off or all be on at the same time" I am really confused ... Thanks 
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#2
11-26-2007, 05:01 PM
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not a typo
Ah..the typical problem, and one that make subnetting so confusing.
Host bits can use more then one octet. For example, a 172.16.0.0/16 means you have 16 host bits. If you have 172.16.255.1/128, that is a valid host, but there is a still a 255 in the ip address. You can have a 0 and a 255 in the IP address, as long as all host bits are not all off: 172.16.0.0 and all on 172.16.255.255, in this example. cheers! Todd
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#3
11-26-2007, 06:46 PM
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No Typo
Hi Todd,
Figured it out .... thanks for the clarification though Cheers
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