300-320 Question #290: Real Exam Question with Answer & Explanation

The correct answer is A: Ethernet over MPLS. Ethernet over MPLS (EoMPLS) and VPLS both transport Ethernet frames including 802.1Q tags natively over an MPLS backbone, supporting site-to-site connectivity with Layer 2 transparency.

Question

Which two WAN technologies support IEEE 802.1Q, site-to-site connectivity, and point-to- point connectivity between two offices? (Choose two.)

Options

AEthernet over MPLS
BVPLS
CLayer 3 MPLS
DDSL
Ecable

Explanation

Ethernet over MPLS (EoMPLS) and VPLS both transport Ethernet frames including 802.1Q tags natively over an MPLS backbone, supporting site-to-site connectivity with Layer 2 transparency.

Common mistakes.

C. Layer 3 MPLS VPN (RFC 4364) operates at the IP layer and does not transport Ethernet frames or preserve 802.1Q VLAN tags between sites.
D. DSL is a physical WAN access technology that does not natively support 802.1Q trunking or provide site-to-site Layer 2 connectivity.
E. Cable (DOCSIS) is a broadband access technology designed for subscriber internet access and does not natively support 802.1Q or enterprise site-to-site Layer 2 transport.

Concept tested. Layer 2 WAN technologies supporting 802.1Q over MPLS

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l2_vpns/configuration/xe-16/mp-l2-vpns-xe-16-book/config-l2-vpns.html

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