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?（）

单项选择题 You are the network administrator at TestKing. You apply the following access list on the E0 outbound interface connected to the 192.168.1.8/29 LAN: access-list 21 deny tcp 192.168.1.8 0.0.0.7 eq 20 any access-list 21 deny tcp 192.168.1.8 0.0.0.7 eq 21 any What will the effect of this access list be?（）