関連ワード:  explain function of data link layer    explain the function of data link layer in osi model    explain different functions of data link layer    explain flow control function of data link layer    list and explain function of data link layer    explain the role of data link layer    explain the role of data link layer in osi model    explain the three main functions of data link layer    briefly explain the functions of data link layer    explain different functions of data link layer of osi reference model