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What protocols from the TCP/IP model, following the proper encapsulation order, are required for an email message sent and received by a PC on a LAN with a reliable connection? (Choose two)
SMTP>TCP>IP>Ethernet
POP3>TCP>IP>Ethernet
SNMP>TCP>IP>Ethernet
POP3>UDP>IP>ARP
SMTP>UDP>IP>Ethernet
POP3>UDP>IP>PPP
The process of encapsulation adds headers and sometimes trailers around data.
For the scenario above, the encapsulation of data in the TCP/IP model follows the next steps:
1. TCP/IP model Application Layer > Create and encapsulate the application data (SMTP is used to send email and POP3 is used to receive email).
2. TCP/IP model Transport Layer > Encapsulate the data given by the application layer inside a transport layer header. TCP is used to provide reliable connectivity.
3. TCP/IP model Internet Layer > Encapsulate the data given by the transport layer inside an IP header.
4. TCP/IP model Network Interface Layer > Encapsulate the data given by the Internet layer and add an Ethernet header and trailer. Transmit the bits over the medium.
For more information refer to: [Todd Lammle. - CCNA Routing and Switching Study Guide, Chapter 1]
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