To answer this question, we need to understand the layers of the OSI (Open Systems Interconnection) model.
Repeaters and hubs operate at the physical layer (Layer 1) of the OSI model.
The physical layer is responsible for the transmission and reception of raw data bits over a physical medium, such as cables or wireless connections. Repeaters and hubs are devices that operate at this layer and are used to amplify or regenerate signals to extend the reach of a network. They do not perform any processing or interpretation of the data.
Let's go through each option to understand why it is correct or incorrect:
Option A) Network - This option is incorrect because repeaters and hubs do not operate at the network layer (Layer 3). The network layer is responsible for routing and addressing of data packets.
Option B) Physical - This option is correct because repeaters and hubs operate at the physical layer (Layer 1) of the OSI model.
Option C) Transport - This option is incorrect because the transport layer (Layer 4) is responsible for reliable end-to-end data delivery and flow control.
Option D) Data link - This option is incorrect because the data link layer (Layer 2) is responsible for the reliable transmission of data frames between adjacent network nodes.
Option E) Presentation - This option is incorrect because the presentation layer (Layer 6) is responsible for data formatting, encryption, and decryption.
The correct answer is B) Physical. This option is correct because repeaters and hubs operate at the physical layer, which deals with the transmission and reception of raw data bits over a physical medium.