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C. Brouter
In the OSI model, which is a conceptual framework used to understand network interactions, different protocols and functionalities operate at various layers. Specifically:
1. Data Link Layer (Layer 2): This layer is responsible for node-to-node data transfer between two directly connected nodes. It also handles error correction from the physical layer. The most notable protocols and components that operate at this layer include Ethernet, Frame Relay, and the Point-to-Point Protocol (PPP). Additionally, switches and bridges operate at this layer, using MAC addresses to forward data to the correct destination.
2. Network Layer (Layer 3): This layer is responsible for packet forwarding including routing through intermediate routers. It is where routing takes place, allowing data to navigate across multiple networks. The Internet Protocol (IP) is the most significant protocol at this layer. Routers operate at the network layer, using IP addresses to direct the packets to their destination.
So, devices and protocols that “operate in the Data Link and the Network layer” include:
– Routers: These operate primarily at the Network layer (Layer 3), but they can also perform some operations that relate to the Data Link layer (Layer 2), especially in routing packets to the correct outgoing interface based on IP addresses.
– Protocols: While most protocols are specific to one layer, some aspects of their operation or related protocols can cross layer boundaries. For instance, ARP (Address Resolution Protocol) helps in resolving the network layer addresses (IP