Networking Functions on the Data Plane

D.

The data plane, also known as the forwarding plane, is responsible for forwarding data packets between network devices. It operates on Layer 2 (Data Link) and Layer 3 (Network) of the OSI model.

Out of the options given, forwarding remote client/server traffic is the only networking function that occurs on the data plane. This refers to the process of forwarding data packets between two devices in a network, such as a client sending a request to a server or two switches exchanging data.

Processing inbound SSH management traffic occurs on the management plane, which is responsible for network management and configuration tasks. This traffic is used for secure remote access to network devices and is handled by the device's CPU.

Sending and receiving OSPF Hello packets is a function of the control plane, which is responsible for managing network protocols and ensuring network stability. OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data packets in a network.

Facilitating spanning-tree elections is also a function of the control plane. Spanning Tree Protocol (STP) is used to prevent network loops by selecting a single path through the network. Spanning-tree elections are used to select the root bridge, which is responsible for coordinating the STP process.

In summary, forwarding remote client/server traffic is the networking function that occurs on the data plane, while the other options occur on the management and control planes.