[单选]
During testing of network redundancy in a fully meshed enterprise campus， a problem has been reported. Both distribution multilayer switches are fully configured for redundancy； clients operate normally when the primary multilayer distribution switch is operating. All clients drop connections outside of their respective access layer group when the primary distribution switch is shut down and the secondary distribution switch is still operational. Additional information indicates that the secondary distribution switch is able to ping major corporate and Internet locations.
Which item would be the best point of troubleshooting for this connectivity issue？（）

A . client network configuration
B . VLAN mapping
C . inter-switch trunk configuration
D . UDLD configuration
E . first-hop redundancy protocol

A developer has used this code within a servlet： 62.if（request.isUserInRole（"vip"）） { 63.// VIP-related logic here 64.} What else must the developer do to ensure that the intended security goal is achieved？（） Create a user called vip in the security realm。 Define a group within the security realm and call it vip。 Define a security-role named vip in the deployment descriptor。 Declare a security-role-ref for vip in the deployment descripto。在粉碎机中，生产能力相同的情况下，耗电量最大的是（）。锤式粉碎机。反击式粉碎机。笼形粉碎机。 CI在（）首先兴起，日本将其推向了一个新的高度。美国。英国。法国。中国。下列关于安全生产许可证申请与管理制度的说法，正确的是（）原颁证机关的审查是办理安全生产许可证延期的必经程序。原颁证机关发现施工单位不再具备相应条件的，应暂扣或吊销安全生产许可证。施工单位遗失安全生产许可证后，应于补办后立即登报声明原证作废。未取得施工许可证的，不能颁发安全生产许可证。远程访问服务有什么用处？

During testing of network redundancy in a fully meshed enterprise campus， a problem has been reported. Both distribution multilayer switches are fully configured for redundancy； clients operate normally when the primary multilayer distribution switch is operating. All clients drop connections outside of their respective access layer group when the primary distribution switch is shut down and the secondary distribution switch is still operational. Additional information indicates that the secondary distribution switch is able to ping major corporate and Internet locations.
Which item would be the best point of troubleshooting for this connectivity issue？（）

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