At which layer of the OSI model does PPP perform?

The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of
the following statements is true concerning this command?

Which two options are valid WAN connectivity methods? (Choose two.)

Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and
has built-in security mechanisms?

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

RouterA is unable to reach RouterB. Both routers are running IOS version 12.0.

After reviewing the command output and graphic, what is the most likely cause of the problem?

Refer to the exhibit.

What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown?

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 are three reasons that an organization with multiple branch offices and roaming users might
implement a Cisco VPN solution instead of point-to-point WAN links? (Choose three.)

Which two statistics appear in show frame-relay map output? (Choose two.)