A Layer 3 network diagram typically includes which items?

• A. Physical cable color codes
• B. IP addressing schemes; Subnetting; Router configuration
• C. Firewall rule sets
• D. User account lists

Answer: (B)

Layer 3 diagrams focus on how data is routed between networks. The key elements are IP addressing schemes, Subnetting, and Router configuration because they define the logical layout: which networks exist, how many hosts each subnet can hold, and how routers connect those subnets to forward packets. In practice, you’d see IP addresses on interfaces, subnet masks, subnet IDs, and the routing setup (static routes or routing protocols) along with device names and connection points. This information directly supports designing and troubleshooting how traffic moves across a routed network.

Physical cable color codes relate to the physical layer and the actual cabling layout, which is not the focus of a Layer 3 diagram. Firewall rule sets pertain to security policies rather than the routing topology, and user account lists are administrative details not part of the network’s routing structure.