Which layer is responsible for achieving and maintaining the physical link between systems
Correct answer: C. The physical layer
- A. The transport layer
- B. The data link layer
- C. The physical layer
- D. The application layer
Explanation
The physical layer is the lowest layer of the Open Systems Interconnection (OSI) model. It is responsible for the physical transmission of data bits across a network connection. This includes things like the physical characteristics of the transmission media (such as cables or wireless signals), the electrical signaling that represents data bits, and the synchronization of data transmission
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Networking covers LAN, MAN, WAN and wireless networks, network topologies, transmission media, devices such as switches, routers and modems, and the OSI and TCP/IP models. Internet concepts include IP addresses, DNS, URLs, web browsers, email, protocols such as HTTP, HTTPS, FTP and SMTP, and basic network security.
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