单项选择题 You have an Active Directory domain named contoso.com. You have a domain controller named Server1 that is configured as a DNS server. Server1 hosts a standard primary zone for contoso.com. The DNS configuration of Server1 is shown in the exhibit. You discover that stale resource records are not automatically removed from the contoso.com zone. You need to ensure that the stale resource records are automatically removed from the contoso.com zone. What should you do?（）

单项选择题 Your network contains a server named Server1 that runs Windows Server 2012 R2. Server1 is located on the same subnet as all of the client computers. A network technician reports that he receives a “Request timed out” error message when he attempts to use the ping utility to connect to Server1 from his client computer. The network technician confirms that he can access resources on Server1 from his client computer. You need to configure Windows Firewall with Advanced Security on Server1 to allow the ping utility to connect. Which rule should you enable?（）

单项选择题 You work as an administrator at Contoso.com. The Contoso.com network consists of a single domain named Contoso.com. All servers on the Contoso.com network have Windows Server 2012 installed. Contoso.com has a server, named ENSUREPASS-SR07, which has the AD DS, DHCP, and DNS server roles installed. Contoso.com also has a server, named ENSUREPASS-SR08, which has the DHCP,and Remote Access server roles installed. You have configured a server, which has the File and Storage Services server role installed, to automatically acquire an IP address. The server is named ENSUREPASS-SR09. You then create a filter on ENSUREPASS-SR07. Which of the following is a reason for this configuration?（）