iSACA Cybersecurity Fundamentals Certification Practice Exam

What is the primary function of the "Network Layer" in the OSI model?

1. Manages signals among network systems

2. Ensures that data are transferred reliably

3. Translates network addresses/routes data from sender to receiver

4. Formats and encrypts data

The correct answer is: Translates network addresses/routes data from sender to receiver

The primary function of the "Network Layer" in the OSI model is to translate network addresses and facilitate the routing of data from the sender to the receiver. This layer is responsible for determining the best path for data to travel across a network and is involved in logical addressing, which enables devices on different networks to communicate effectively. In practical terms, the Network Layer manages the packet routing, addressing, and forwarding necessary for packets to reach their intended destinations. It handles tasks such as traffic control, fragmentation and reassembly of packets, and logical addressing using protocols such as Internet Protocol (IP), which provides a unique identifier for devices on a network. The other functions mentioned in the other options pertain to different layers in the OSI model. For instance, managing signals among network systems is a responsibility associated with the Physical Layer, while ensuring reliable data transfer is attributed to the Transport Layer. Formatting and encrypting data is performed primarily by the Presentation Layer. Thus, selecting the correct option highlights an understanding of the specific roles each layer plays in the OSI model.