单项选择题 A remote user cannot connect to the office via VPN. The user has established Internet connectivity. Which of the following is the MOST likely next step in troubleshooting?（）

单项选择题 Which of the following routing protocols uses AS-Path as one of the methods to build the routing table?（）

单项选择题 There are two networks sharing the same office space. One network already has an 802.11g accesspoint. The second network acquires one as well. If known, which of the following would help keep the two networks from interfering with each other?（）