Which three of these Metro service types map to E-Line (versus E-LAN) services that are defined by the Metro Ethernet Forum (MEF)? (Choose three.)

Question

Options

• AEthernet Private Line
• BEthernet Wire Service
• CEthernet Relay Service
• DEthernet Multipoint Service
• EEthernet Relay Multipoint Service

• A
  86% (25)
• D
  7% (2)
• E
  7% (2)

Explanation

Answers A (Ethernet Private Line), B (Ethernet Wire Service), and C (Ethernet Relay Service) are correct. The MEF defines E-Line services as point-to-point Ethernet Virtual Connections (EVCs) between exactly two User-to-Network Interfaces (UNIs). EPL (Ethernet Private Line) provides a dedicated point-to-point service with no service multiplexing. EWS (Ethernet Wire Service) is the MEF term for a point-to-point service that transparently carries all traffic. ERS (Ethernet Relay Service) is also point-to-point but allows service multiplexing. Options D (Ethernet Multipoint Service) and E (Ethernet Relay Multipoint Service) both map to E-LAN services, which are multipoint-to-multipoint services connecting three or more UNIs - analogous to a LAN across the Metro network, not a point-to-point wire.

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