Which are three advantages of PPPoA implementation? (Choose three)

A.
NAP and NSP provide secure access to corporate gateways without managing end-to-end
PVCs. NAP and NSP use Layer 3 routing, Layer 2 Forwarding, or Layer 2 Tunneling Protocol
tunnels. Hence, they can scale their business models for selling wholesale service.

B.
The NSP can oversubscribe by deploying idle and session timeouts using an industry standard
RADIUS server for each subscriber.

C.
Only a single session per CPE on one virtual channel (VC). The username and password are
configured on the CPE, so all users behind the CPE for that particular VC can access only one set
of services. Users cannot select different sets of services, although using multiple VCs and
establishing different PPP session on different VCs is possible.

D.
If a single IP address is provided to the CPE, and NAT or PAT is implemented, certain
applications such as IPTV, which embed IP information in the payload, well not work. Additionally,
if an IP subnet feature is used, an IP address also has to be reserved for the CPE.

E.
PPPoA can use the features on the Cisco Service Selection Gateway (SSG)

Explanation:
eference:
http://www.cisco.com/en/US/tech/tk175/tk819/technologies_white_paper09186a0080093bd2.shtml