题目内容

单选题 The ( ) layer of the OSI model is responsible for source-to-destination delivery of the entire message.

A. transport
B. network
C. data-link
D. session

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单选题 The ( ) layer of the OSI model is responsible for source-to-destination delivery of an individual packet.

A. transport
B. network
C. data-link
D. session

单选题 The ( ) layer of the OSI model controls the dialog between users.

A. transport
B. session
C. presentation
D. application

单选题 Through the ( )layer of the OSI model, mail services and directory services are a available to network users.

A. data connection
B. session
C. transport
D. application

单选题 What is the domain name in the email address kayla@pit.arc.nasa.gov?

A. kayla
B. pit.arc.nasa.gov
C. kayla@pit.arc.nasa.gov
D. nasa.gov