What benefit results from implementation of Layer 3 switching versus Layer 2 switching in a fully meshed campus network？（） ["ease of IP address assignment versus use of external routers","redundancy from trunking between distribution layer switches","provides first-hop redundancy to clients","allows inter-VLAN communication without requiring complexity of routing protocol"]
某施工单位向一建筑机械厂发出要约，欲购买一台挖掘机，则下列情形中，会导致要约失效的是（）。 ["建筑机械厂及时回涵，对要约提出非实质性变更","承诺期限届满，建筑机械厂未作出承诺","建筑机械厂发出承诺后，受到撤消该要约的通知","建筑机械厂发出承诺前，收到撤回该要约的通知"]
崇高的理想、坚定的信念，是共产党人的强大精神支柱，是推动党和人民事业前进的强大精神力量。
Which JSTL code snippet can be used to perform URL rewriting？（） ["<a href=’<c：url url="foo.jsp"\/>’ \/>","<a href=’<c：link url="foo.jsp"\/>’ \/>","<a href=’<c：url value="foo.jsp"\/>’ \/>","<a href=’<c：link value="foo.jsp"\/>’ \/>"]
You are the administrator of a Windows 2000 network. The network has 100 Windows 2000 Professional computers. A graphics application was assigned to all the computers on the network by using a Group Policy object (GPO). You deploy a service release for the graphics application to all of the Windows 2000 Professional computers on the network. The service release, in addition to other software that had been assigned, fails to install on only one of the computers. What should you do?（） ["Restart Windows Installer on the domain controller.","Restart Windows Installer on the computer that failed to install the service release.","Redeploy the service release by using an .mst file.","Redeploy the service release by using a .zap file."]
当用户访问Internet资源时，为什么需要名称解析？
