Which Layer 2 VPN technology is implemented over an IP core network without the need for
MPLS?
A.
VPLS
B.
VPWS
C.
AToM
D.
L2TPv3
Explanation:
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html#wp1040784
The Layer 2 Tunnel Protocol Version 3 feature expands on Cisco support of the Layer 2 Tunnel
ProtocolVersion 3 (L2TPv3). L2TPv3 is an Internet Engineering Task Force (IETF) l2tpext working
group draft thatprovides several enhancements to L2TP for the capability to tunnel any Layer 2
payload over L2TP.
Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core
network usingLayer 2 virtual private networks (VPNs). Benefits of this feature include the following:
•L2TPv3 simplifies deployment of VPNs
•L2TPv3 does not require Multiprotocol Label Switching
•L2TPv3 supports Layer 2 tunneling over IP for any payload
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