填空题
抑制技术；缓存技术；窗口机制
Which two values are used by Spanning Tree Protocol to ...
多项选择题Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。
A.amount of RAM B.bridge priority C.IOS version D.IP address E.MAC address F.speed of the links
Which component of VPN technology ensures that data can...
单项选择题Which component of VPN technology ensures that data can be read only by its intended recipient?（）
A.dataintegrity B.encryption C.keyexchange D.authentication
An inbound access list has been configured on a serial ...
多项选择题An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL? （）
A.FTP B.Telnet C.SMTP D.DNS E.HTTP F.POP3
