6 Comments on “Which of the following represents the maximum length in characters, including periods, of an Active Directory ”

1. sergey says:

   October 10, 2015 at 4:36 pm

   The maximum length of the host name and of the fully qualified domain name (FQDN) is 63 octets per label and 255 bytes per FQDN. This maximum includes 254 bytes for the FQDN and one byte for the ending dot.

   
   
   
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2. sergey says:

   October 10, 2015 at 4:37 pm

   https://support.microsoft.com/en-us/kb/909264

   
   
   
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3. mikieeee says:

   November 1, 2015 at 3:05 pm

   the limit isn’t the number of characters; it’s the number of octets.

   a domain-name is represented as a series of labels, and is terminated by a label of length zero. (The label of length zero represents the root label.) A label consists of a length octet followed by that number of octets representing the name itself. Therefore, the domain name http://www.microsoft.com is encoded as follows:

   3 ‘w’ ‘w’ ‘w’ 9 ‘m’ ‘i’ ‘c’ ‘r’ ‘o’ ‘s’ ‘o’ ‘f’ ‘t’ 3 ‘c’ ‘o’ ‘m’ 0

   Technically, http://www.microsoft.com is shorthand for http://www.microsoft.com. with a trailing period, and the trailing zero byte encodes that implied period.

   If you sit down and do the math, you’ll see that the the readable maximum length of an ASCII DNS name is 253 characters: You don’t encode the dots, but you do encode the length bytes, so they cancel out, except for the length byte of the first label and the length byte of the root label, for an additional cost of two bytes.

   MikeZZL

   
   
   
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4. Hassona says:

   December 23, 2015 at 6:09 pm

   answer is A

   
   
   
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5. Hassona says:

   December 23, 2015 at 6:09 pm

   http://blogs.technet.com/b/fabricem_blogs/archive/2009/07/21/active-directory-maximum-limits-scalability.aspx

   
   
   
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6. MancaMulas says:

   February 16, 2016 at 10:19 pm

   Answer A is correct.

   https://technet.microsoft.com/en-us/library/active-directory-maximum-limits-scalability(v=ws.10).aspx

   “FQDN Length Limitations
   Fully qualified domain names (FQDNs) in Active Directory cannot exceed 64 characters in total length, including hyphens and periods (.). For example, the following host name has 65 characters; therefore, it is not valid in an Active Directory domain:
   server10.branch-15.southaz.westernregion.northamerica.contoso.com
   This is an important limitation to keep in mind when you name domains.”

   
   
   
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