What type of map contains essential information regarding nodes in a network?

The type of map that contains essential information regarding nodes in a network is a topology map. Topology maps are specifically designed to show the arrangement and connections of nodes within a network, illustrating how each component connects with others and forming a visual representation of the network's structure. This includes information about routers, switches, and how data flows through different paths.

Topology maps provide critical insights for network design, troubleshooting, and planning, as they outline the physical or logical layout of networking devices and their interconnections. This can help technicians understand the network's capabilities and weaknesses, making topology maps invaluable in the context of network installation and operation.

While design maps and coverage maps focus on different aspects of network planning and deployment, such as layout and reach, they do not convey the specific node connections that a topology map provides. Similarly, service area maps are mainly concerned with the geographical areas covered by services, rather than the detailed arrangement and interaction of nodes within the network itself.