Which of the following network protocols will MOST likely be used when sending and receiving...

 SMTP and POP3 are the most likely network protocols that will be used when sending and receiving Internet email. SMTP stands for Simple Mail Transfer Protocol, which is a protocol that enables the transmission of email messages from a client to a server or from one server to another. SMTP is used to send outgoing email messages. POP3 stands for Post Office Protocol version 3, which is a protocol that enables the retrieval of email messages from a server to a client. POP3 is used to download incoming email messages. References : The Official CompTIA IT Fundamentals (ITF+) Study Guide (FC0-U61), page 166.