单项选择题 You are the network administrator for your company. You need to provide Internet name resolution services for the company. You set up a Windows Server 2003 computer running the DNS Server service to provide this network service.   During testing， you notice the following intermittent problems：   Name resolution queries sometimes take longer than one minute to resolve.   Some valid name resolution queries receive the following error message in the Nslookup command-line tool： "Non-existent domain."   You suspect that there is a problem with name resolution.   You need to review the individual queries that the server handles. You want to configure monitoring on the DNS server to troubleshoot the problem.   What should you do？ （）

单项选择题 You are the network administrator for your company. The network consists of a single Active Directory domain. The network contains Windows Server 2003 file servers. The network also contains a Windows Server 2003 computer named Server1 that runs Routing and Remote Access and Internet Authentication Service （IAS）. Server1 provides VPN access to the network for users’ home computers.   You suspect that an external unauthorized user is attempting to access the network through Server1. You want to log the details of access attempts by VPN users when they attempt to access the network. You want to compare the IP addresses of users’ home computers with the IP addresses used in the access attempts to verify that the users are authorized.  You need to configure Server1 to log the details of access attempts by VPN users.   What should you do？  （）

单项选择题 You are the network administrator for your company. The network consists of a single Active Directory domain. All computers on the network are members of the domain.   You administer a four-node Network Load Balancing cluster. All nodes run Windows Server 2003. The cluster has converged successfully. You use Network Load Balancing Manager on the default host to configure all nodes of the cluster.   The nodes have a single network adapter and are connected to the same switching hub device.   Administrators of non-cluster servers that are connected to the same switching hub device report that their servers receive traffic that is destined for the cluster nodes. Receiving this additional network traffic impairs the network performance of the non-cluster servers.   You need to ensure that traffic destined for only the cluster nodes is not sent to all ports of the switching hub device.  You do not want to move the cluster to another switching hub device.   What should you do？ （）