Your network contains an Active Directory domain named contoso.com. The domain contains a
domain controller named DC1 that runs Windows Server 2012 R2 and a client computer named
Computer1 that runs windows 8.
DC1 is configured as a DHCP server as shown in the exhibit. (Click the Exhibit button.)
Computer1 is configured to obtain an IP address automatically.
You notice that Computer1 is unable to obtain an IP address from DC1.
You need to ensure that Computer1 can receive an IP address from DC1.
What should you do?
A.
Disable the Allow filters.
B.
Disable the Deny filters.
C.
Authorize DC1.contoso.com.
D.
Activate Scope [10.1.1.0] Contoso.com.
Explanation:
A red down arrow indicates an unauthorized DHCP server. A DHCP server that is a domain controller
or a member of an Active Directory domain queries Active Directory for the list of authorized servers
(identified by IP address). If its own IP address is not in the list of authorized DHCP servers, the DHCP
Server service does not complete its startup sequence and automatically shuts down.
Can anyone elaborate on this? The red down arrow is on Deny, so why would we disable the allow filters? The explanation doesn’t say anything about filters.
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If I’m not mistaken, the Allow filters work similarly to a White List. In a white list, everything is denied unless specifically added to the white list. If you disable the Allow Filter, this will allow without having to be put in the white list.
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Ok great, that makes sense. Thanks
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Weewoo is correct, the Allow filter is essentially a whitelist. It gives you the ability to add MAC addresses to ensure that only the computers you specify are allowed to get IP addresses from DHCP.
The Deny filter functions the same way, but allows you to ensure the added MAC addresses will not get DHCP service.
Note: Both the Allow and Deny filters are disabled by default in IPv4. It doesn’t appear that filtering is available in IPv6.
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A answer is correct, explanation is incorrect.
according to the picture DHCP server is authorized already and the scope is active (there are no red arrows facing down)
Allow filter is enabled (no red arrow) which means only devices with MAC addresses specified in Allow filter will receive IP settings from the DHCP server. We need to disable Allow filter to allow all devices receive IP settings.
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Great and simple explanation luischavez714. Thanks
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