What can a network administrator utilize by using PPP Layer 2 encapsulation? (choose three)

A.
quality of service

B.
compression

C.
authentication

D.
VLAN support

E.
multilink support

F.
Quality of service

Explanation:
Compared to HDLC ,PPP has more features. Similar to HDLC, PPP defines a type of frame and how to communicate between PPP devices including the multiplexed networks and the data link layer protocols cross the same link. However, PPP has more characteristics as follows:
Perform the dynamic configuration of the link.
Allow for authentication.
Compress packet header.
Test the quality of the link.
Complete detecting and troubleshooting.
Allow for combining many PPP physical links into a single logical link.
PPP has 3 main components.
.frame format
LCP(Link Control Protocol)