Which of the following describes a computing model where devices act as both clients and servers?

The peer-to-peer computing model is characterized by devices that function both as clients and servers. In this setup, each device can request and provide resources, facilitating direct communication and resource sharing among peers without the need for a centralized server. This model contrasts with traditional client-server architectures, where clients request services from dedicated servers.

In a peer-to-peer network, each participant (or peer) can share files, services, and even processing power with other participants, reflecting a decentralized approach. This flexibility not only enhances resource distribution but can also improve fault tolerance, as the failure of one peer does not impede the overall network functionality, allowing other peers to continue operating effectively.

The other options describe different computing models where the roles of clients and servers are more distinct and typically centralized. For instance, the client-server model has dedicated servers providing resources to client devices, while monolithic structures involve a single-tier architecture where all components reside on a single platform. An intranet refers to a private network that uses internet protocols but does not describe a model where devices share dual roles as in a peer-to-peer environment. Therefore, peer-to-peer is the correct choice for this question, as it distinctly highlights the collaborative and dual-function nature of devices in the network.