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

What is the subnetwork address for a host with the IP address 201.100.5.68/28?（）

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

What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command?（）

A router receives information about network 192.168.10.0/24 from multiple sources.What will the router consider the most reliable information about the path to that network?（）

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

What is the default administrative distance of OSPF?（）

Three access ports have been installed and configured to a small office.What term defines the wireless topology?（）

How are VTP advertisements delivered to switches across the network?（）

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?（）