CERTIFIED-IN-CYBERSECURITY Question #525: Real Exam Question with Answer & Explanation

Question

What are the two PRIMARY transport layer protocols?

Options

• AHTTPS and TCP
• BTCP and ICMP
• CICMP and IMAP
• DTCP and UDP

Explanation

The two primary Transport Layer protocols in the Internet Protocol suite are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) (see ISC2 Study Guide, Chapter 4, Module 1). TCP is a connection-oriented protocol that provides reliable, ordered, and error- tested delivery of a stream of bytes between applications running on hosts communicating over an IP network. UDP is a simpler, connectionless Internet protocol that allows messages, also known as datagrams, to be sent without first communicating to establish special transmission channels or data paths. For example, when you browse a Web site, your computer uses TCP to request data from the Web site's server and then waits for the response. On the other hand, when you make a VoIP call or stream video, your computer might use UDP, where speed of delivery is more important than perfect delivery. The other options are incorrect, even though they are valid protocol names. HTTPS is an application layer protocol, not a transport layer protocol. ICMP, or Internet Control Message Protocol, is a supporting protocol in the Internet protocol suite used by network devices such as routers to send error messages indicating, for example, that a requested service is unavailable or that a host or router cannot be reached. IMAP, or Internet Message Access Protocol, is a standard Internet protocol that e-mail clients use to retrieve messages from a mail server. Therefore, these options are not correct answers to the question.

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