If the unit exchanged at the data link level is called a frame and the unit exchanged at the networ

题目

If the unit exchanged at the data link level is called a frame and the unit exchanged at the networ
尤其是frames encapsulate packets 和packets encapsulate frames
If the unit exchanged at the data link level is called a frame and the unit exchanged at the network level is called a packet,do frames encapsulate packets or do packets encapsulate frames？

答案

如果把数字（信息）环节的交换单元称为既定程序,把网络环节的交换单元称为程序包（package）,那么是程序包包含在既定程序内,还是既定程序包含在程序包内?
我是按字面瞎蒙的,