Chapter 4 Infrastructure and integration 29
When the build number is sent to the Exchange Server, it’s converted from the format NANNNA
(where N is numeric and A is an alphabetic character) to the Exchange format NNN.NNN. Numeric
values are kept, but letters are converted to their position value in the alphabet. For example, “F”
is converted to “06” because it’s the sixth letter in the alphabet. Numbers are padded with zeros
if necessary, to t the Exchange format. In this example, the build number 7E18 is converted to
“705.018.”
The rst number, 7, remains as “7.” The character E is the fth letter in the alphabet so it’s
converted to “05.” A period (.) is inserted in the converted version, as required by the format.
The next number,18, is padded with zero and converted to “018.”
If the build number ends with a letter, such as 5H11A, the number is converted as described
above, and the numeric value of the nal character is appended to the string, separated by
3 zeroes. So 5H11A becomes “508.01100001.”
Remote Wipe
You can remotely wipe the contents of an iOS device using features provided by Exchange.
Wiping removes all data and conguration information from the device, and the device is
securely erased and restored to its original factory settings. Wiping removes the encryption
key to the data (encrypted using 256-bit AES encryption), which immediately makes all of the
data unrecoverable.
With Microsoft Exchange Server 2007 or later, you can perform a remote wipe with the Exchange
Management Console, Outlook Web Access, or the Exchange ActiveSync Mobile Administration
Web Tool. With Microsoft Exchange Server 2003, you can initiate a remote wipe using the
Exchange ActiveSync Mobile Administration Web Tool.
Alternatively, users can wipe their own device by going to Settings > General > Reset and
choosing “Erase All Content and Settings.” Devices can also be congured to be automatically
wiped after a specied number of failed passcode attempts.
Bonjour
Bonjour is Apple’s standards-based, zero conguration network protocol that lets devices nd
services on a network. iOS devices use Bonjour to discover AirPrint-compatible printers, and both
iOS devices and Mac computers use Bonjour to discover AirPlay-compatible devices such as
Apple TV. Some apps also use Bonjour for peer-to-peer collaboration and sharing.
Bonjour works by using multicast trac to advertise the availability of services. Multicast trac is
usually not routed, so make sure Apple TV devices or AirPrint printers are on the same IP subnet
as the iOS devices that would use them. If your network is larger and utilizes many IP subnets,
you may want to consider using a Bonjour gateway such as those oered by various Wi-Fi
infrastructure manufactures.
For more information about Bonjour, see Apple’s Bonjour webpage and Apple's Developer
documentation on Bonjour.
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