2.Network Models

The ______ layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver.

• data link
• network
• physical
• none of the above

Which of the following is an application layer service?

• File transfer and access
• Mail service
• Remote log-in
• All the above

When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s _______ layer.

• Transport
• Application
• Physical
• None of the above

__________ provides full transport layer services to applications.

• UDP
• TCP
• ARP
• none of the above

The process-to-process delivery of the entire message is the responsibility of the _______ layer.

• Transport
• Application
• Physical
• Network

The ______ layer is responsible for moving frames from one hop (node) to the next.

• transport
• data link
• physical
• none of the above

The _______ layer is responsible for delivering data units from one station to the next without errors.

• physical
• data link
• transport
• network

The session, presentation, and application layers are the ______ support layers.

• user
• network
• both (a) and (b)
• neither (a) nor (b)

The physical, data link, and network layers are the ______ support layers.

• network
• user
• both (a) and (b)
• neither (a) nor (b)

The ________ layer is responsible for the process-to-process delivery of the entire message.

• transport
• physical
• network
• data link