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8. Differentiate between the following WAN service: Frame Relay, ISDN / LAPD, HDLC, & PPP.

1. Which are true about Frame Relay? (CATAList)
   A. A physical connection between two DTEs across a packet-switched network (PSN).
   B. Faster and more efficient than X.25.
   C. Identified by Data Link Controller Identifier (DLCI).
   D. Predecessor of X.25.
   E. Uses PVC at layer two.

2. Which are true about ISDN? (CATAList)
   A. Can transmit voice and data.
   B. Cannot transmit video.
   C. Digital service that runs over existing telephone networks.
   D. Internetwork Services Digital Network.
   E. Special cable is needed to use it.

3. Which are true about HDLC? (CATAList)
   A. Cisco's HDLC cannot communicate with any other vendor's HDLC.
   B. Covers two layers of the OSI Reference model.
   C. Not a default encapsulation for Cisco serial interface.
   D. It's predecessor is Synchronous Data Link Control (SDLC).

4. Which protocols supported by PPP? (CATAList)

5. Which protocol supported by PPP's predecessor? (CATAList)
   A. AppleTalk.
   B. DECNet.
   C. IP.
   D. IPX.
   E. OSI/CLNS.
   F. Transparent bridging.

±1 question cover this objective!

Find the answers below!

1-BE; 2-AC; 3-AD; 4-ABCDEF; 5-IP.