单项选择题 A new frame-relay network is being implemented and inverse ARP does not appear to be operating correctly. Which alternative command can be used to provide connectivity?（）

单项选择题 When configuring Frame Relay using point-to-point subinterfaces, which of the following must not be configured?（）

多项选择题 A network administrator has configured access list 172 to prevent Telnet and ICMP traffic from reaching a server with the address if 192.168.13.26. Which command can the administrator issue to verify that the access list is working properly?（）