252 wpad-explanation: you should configure the 252 wpad dhcp option. web proxy auto discovery (wpad) enables computers to discover the address of the local isa server through a process called autodiscovery. the automatically detect settings option should be enabled in internet explorer on the client computers. when a computer is started, a dhcp server will provide the url to the location on an intranet web server where the autoconfiguration script is stored. internet explorer will connect to that url, download and execute the script, which will configure internet explorer with the appropriate proxy server settings. the 003 router dhcp option is used to configure a default gateway address for dhcp client computers. the 006 dns servers option is used to configure client computers with one or more dns server addresses for name resolution. you might choose to configure these options on dhcp servers to facilitate the configuration of portable computers as their users move between sites. however, these options are irrelevant to the task in this scenario. the 015 dns domain name option is used to configure client computers with the domain name that should be appended to unqualified host names before those names are submitted to a dns server for resolution. if the 252 wpad dhcp option referenced the intranet web server that contained the auto-configuration script by the servers unqualified name, then client computers would append the domain names from their dns suffix search list before attempting to resolve the servers name. by default, the dns suffix search list contains only the primary dns suffix and any connection-specific suffixes. the primary dns suffix is usually the name of the active directory domain to which the computer belongs. if the intranet web server at each site in this scenario belonged to a different domain, then a portable computer would not be able to resolve the names of the web servers from the domains other than the one to which that portable computer belonged. to address this problem, you would configure the 015 dns domain name option on the dhcp server at each site with the name of the appropriate domain. in this scenario, the network consists of a single active directory domain, and the scenario does not indicate whether the intranet web servers name in the url in the 252 wpad dhcp option is unqualified. therefore, you do not need to configure the 015 dns domain name dhcp option in this scenario.