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300-320 · Question #290

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

The correct answer is A. Ethernet over MPLS B. VPLS. 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.

Advanced WAN Services

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

How the community answered

(32 responses)
  • A
    88% (28)
  • C
    3% (1)
  • D
    3% (1)
  • E
    6% (2)

Why each option

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.

AEthernet over MPLSCorrect

EoMPLS (Ethernet over MPLS) is a pseudowire technology that encapsulates Ethernet frames, including 802.1Q-tagged frames, inside MPLS labels, providing point-to-point Layer 2 connectivity between two sites over an MPLS core.

BVPLSCorrect

VPLS (Virtual Private LAN Service) is a multipoint Layer 2 VPN over MPLS that preserves 802.1Q tags and can be configured to emulate point-to-point connections, providing site-to-site Ethernet connectivity with VLAN awareness.

CLayer 3 MPLS

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.

DDSL

DSL is a physical WAN access technology that does not natively support 802.1Q trunking or provide site-to-site Layer 2 connectivity.

Ecable

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

Source: 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

Topics

#EoMPLS#VPLS#IEEE 802.1Q#WAN site-to-site

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