Which of the following encapsulates PPP frames in Ethernet frames and uses common PPP features like authentication, encryption, and compression?
Answer: C
PPPoE encapsulates PPP frames in Ethernet frames and uses common PPP features like authentication, encryption, and compression. PPPoA is used for ATM.
How should a router that is being used in a Frame Relay network be configured to keep split horizon issues from preventing routing updates?
Answer: A
If you have a serial port configured with multiple DLCIs connected to multiple remote sites, split horizon rules, stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.
Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?
Answer: B
If you have a router in your Frame Relay network that does not support IARP, you must create Frame Relay maps on your router, which provide known DLCI-to-IP address mappings.
When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?
Answer: A
Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your nonproduction test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.
Which of the following uses ATM as the Data Link layer protocol that's terminated at what's known as the DSLAM?
Answer: A
ATM is the Data-Link layer protocol that's typically used over the DSL layer 1 connection from the CPE and terminated at what's known as the DSLAM-an ATM switch that contains DSL interface cards, or ATU-Cs.