ISC2 Certified in Cybersecurity (CC) Practice Question
In the four-layer TCP/IP model, what key responsibility is assigned to the Network Access (Link) layer when data is transmitted from a host across a network?
Encrypting application payloads to ensure confidentiality before transmission
Providing end-to-end session establishment and reliable sequencing for applications
Encapsulating IP packets into frames and managing physical signaling on the local medium
Determining optimal paths and forwarding packets between different networks
The Network Access (Link) layer deals with how data actually moves across the local network medium. It encapsulates IP packets into frames, handles hardware addressing, and converts the data into the appropriate electrical, optical, or radio signals for transmission. Routing between networks is handled by the Internet layer, reliable end-to-end delivery is the Transport layer's role, and encryption of application data is performed at higher layers or by separate security protocols, not by the Link layer.
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ISC2 Certified in Cybersecurity (CC)
Network Security
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