(ISC)2 Certified in Cybersecurity Practice Exam

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What is the standard protocol for the transmission of data in packet-switched networks?

Internet Protocol (IPv4)
Transmission Control Protocol (TCP)
User Datagram Protocol (UDP)
File Transfer Protocol (FTP)

The correct answer is: Internet Protocol (IPv4)

The standard protocol for the transmission of data in packet-switched networks is the Internet Protocol (IPv4). IPv4 is fundamental to the functionality of the internet and packet-switched networks because it is responsible for addressing and routing packets of data between devices across a network. In packet-switched networks, data is divided into packets that are transmitted independently. Each packet contains both the source and destination IP addresses, which allow routers across the network to determine the best path for each packet to reach its destination. This methodology supports efficient use of the network resources and enhances reliability since packets can take different routes based on the current network conditions. While Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) play significant roles in how data is transmitted (with TCP providing reliable, connection-oriented communication and UDP offering a connectionless, faster alternative), they operate on top of the Internet Protocol, which is essential for the actual transmission of packets. File Transfer Protocol (FTP) is an application layer protocol used specifically for transferring files, and it also relies on TCP/IP for its operations. Thus, IPv4 serves as the foundational protocol that governs the addressing and routing of packets in packet-switched networks, making it the correct choice in this context.