Which Cisco IOS diagnostics command can disrupt the operation of a router under high-load conditions?（）

At which layer of the OSI model dose PPP perform?（）

At which layer of the OSI model is RSTP used to prevent loops?（）

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

Which statement describes the rule of split horizon?（）

You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）

Which command encrypts all plaintext passwords?（）

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?（）

What is the purpose of the cisco Vlan Trunking protocol?（）

After the show ip route command has been entered,the follwing routes are displayed.Which route will not be entered into the routing table of a neighboring router?（）