DRAG DROP
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Assuming a reliable connection is required, move the protocol on the left to the TCP/IP layers on the right to show the proper encapsulation for an email message sent by a host on a LAN. (Not all options are used.)
Answer: 
Explanation:
Simple Mail Transfer Protocol (SMTP) is used to send mail across the internet. … internet, it is not a transport layer protocol but is an application layer protocol.
The Transmission Control Protocol provides a communication service at an intermediate level between an application program and the Internet Protocol. It provides host-to-host connectivity at the Transport Layer of the Internet model.
It is about proper encapsulation for an email message, so SMTP .
Network Access Layer
The Network Access Layer is the layer in the TCP/IP model at which data is transmitted and received across the physical network.
A network interface device, usually a line card, adaptor or port is used to connect the physical wires or fibers to the computer so that it can communicate with other computers. This network interface is assigned an address from the Internet Layer so that it can communicate with devices on other networks.
Several protocols serve various functions at the Network Access layer, including:
Ethernet
Wireless 802.11A, 802.11B, 802.11G and 802.11N
FDDI
ATM
http://www.inetdaemon.com/tutorials/basic_concepts/network_models/TCP-IP_model/network_access_layer.shtml
STIE
Network Access layer combines the OSI model physical and data link layers, so physical Ethernet is answer