Teacher:In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Teacher: Now, understand the problem? Solve this instance: Protocols including Packet over SONET / SDH , MPLS , ATM and Frame relay are often used by service providers to deliver the links that are used in WANs .
Student:
Protocols including Packet over SONET / SDH , Multiprotocol Label Switching ( MPLS ) , Asynchronous Transfer Mode ( ATM ) and Frame Relay are often used by service providers to deliver the links that are used in WANs .