Which statement describes the rule of split horizon?（）

Which statement is true, as relates to classful or classless routing?（）

Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?（）

On which options are standard access list based?（）

Which command is used to display the collection of OSPF link states?（）

While troubleshooting a network problem,a technician discovers that the current copy of the Cisco IOS is outdated and needs to be updated.Which of the following commands would the technician issue to replace the Cisco router IOS with the newer version?（）

Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?（）

Which IPsec security protocol should be used when confidentiality is required?（）

When you are troubleshooting an ACL issue on a router,which command can help you to verify which interfaces are affected by the ACL?（）

A network administrator needs to configure a serial link between the main office and a remote location.The router at the remote office is a non-cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?（）