関連ワード:  what is data link layer in osi model    what is data link layer in osi model with example    what is the data link layer in osi model responsible for    what is the function of data link layer in osi model    what is the role of data link layer in osi model    what is the work of data link layer in osi model    what is the use of data link layer in osi model    what is the purpose of data link layer in osi model    what is the main function of data link layer in osi model    what is the primary function of data link layer in osi model