Your company has a single active directory domain. The company network is protected by a firewall. Remote users connect to your network through a VPN server by using PPTP. When the users try to connect to the VPN server， they receive the following error message： Error 721： The remote computer is not responding. You need to ensure that users can establish a VPN connection. What should you do？ （） ["Open port 1423 on the firewall","Open port 1723 on the firewall","Open port 3389 on the firewall","Open port 6000 on the firewall"]
以改革创新精神加强党的建设，必须以（）为重点加强组织建设。 ["以坚定理想信念","以保持党同人民群众的血肉联系","以造就高素质党员、干部队伍","以健全民主集中制"]
（）属于DHCP的缺点。 ["安全可靠","自动配置网络","节约IP地址空间","服务器发生故障可导致网络瘫痪"]
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