Which of the following connects more than two UNIs and enables each UNI to communicate with every other UNI in the configuration? (Select the best answer.)

Last Updated on August 7, 2021 by Admin 3

Which of the following connects more than two UNIs and enables each UNI to communicate with every other UNI in the configuration? (Select the best answer.)

  • E-LAN
  • EPL
  • E-Tree
  • EVPL
Explanation:
An ELAN service connects more than two User Network Interfaces (UNIs) and enables each UNI to communicate with every other UNI in the configuration. An ELAN is a multipointtomultipoint Ethernet virtual connection (EVC). A UNI is the physical demarcation between a service provider and a subscriber. ELAN services fully mesh two or more UNIs and follow a specific set of rules for delivering service frames to a UNI. Each UNI in an ELAN can communicate with any other UNI in the ELAN. ELANs typically have a distance limitation of 50 miles (80 kilometers). Layer 2 Virtual Private Networks (L2VPNs) and multipoint L2VPNs are examples of ELANs.
Both Ethernet private line (EPL) and Ethernet virtual private line (EVPL) are Eline services. Eline services are Ethernet pointtopoint EVC services that can be used to connect two UNIs. Therefore, an Eline does not connect more than two UNIs. The difference between an EPL and an EVPL is that an EVPL is capable of service multiplexing. In addition, an EPL requires full service frame transparency. An EVPL does not.
An ETree is a pointtomultipoint EVC that resembles a hubandspoke configuration. Therefore, an ETree does not enable each UNI to communicate with every other UNI in the configuration. An ETree service connects more than one UNI to a single root UNI or leaf UNI. Root UNIs can send data to any leaf UNI. However, a leaf UNI can send traffic only to a root UNI. ETrees are typically used to provide Internet access to multiple sites.

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