Network configuration documentation provides a logical diagram of the network and detailed information about each component.

Network documentation should include these components:

• Network configuration table
• End-system configuration table
• Network topology diagram
• The existing network strengths and weaknesses and how they impact the business goals


Network Configuration Table

Contains accurate, up-to-date records of the hardware and software used in a network.

Example:

The table in the figure illustrates the data set that should be included for all components:

• Type of device, model designation
• IOS image name 
• Device network hostname 
• Location of the device (building, floor, room, rack, panel) 
• If it is a modular device, include all module types and in which module slot they are located
• Data link layer addresses 
• Network layer addresses 
• Any additional important information about physical aspects of the device

End-system Configuration Table

Contains baseline records of the hardware and software used in end-system devices such as servers, network management consoles, and desktop workstations. An incorrectly configured end system can have a negative impact on the overall performance of a network.

For troubleshooting purposes, the following information should be documented:

• Device name (purpose) 
• Operating system and version 
• IP address 
• Subnet mask
• Default gateway, DNS server, and WINS server addresses 
• Any high-bandwidth network applications that the end-system runs

Example:

•Network Topology Diagram

Graphical representation of a network, which illustrates how each device in a network is connected and its logical architecture. A topology diagram shares many of the same components as the network configuration table. Each network device should be represented on the diagram with consistent notation or a graphical symbol. Also, each logical and physical connection should be represented using a simple line or other appropriate symbol. Routing protocols can also be shown.

A physical network diagram shows the physical layout of the devices connected to the network. 

Typically includes:
•  Device type
• Model and manufacturer
• Operating system version
• Cable type and identifier
• Cable specification
• Connector type
• Cabling endpoints



Example:
• A logical network diagram shows how data is transferred on the network.
Typically includes:
• Device identifiers
• IP address and subnet
• Interface identifiers
• Connection type
• DLCI for virtual circuits
• Site-to-site VPNs
• Routing protocols
• Static routes
• Data-link protocols
• WAN technologies used
Example:
Example: Physical Layout - All Buildings on campus

Example: Physical Topology – Site LAN

Example: physical Topology
The existing network strengths and weaknesses and how they impact the business goals

The network designer creates a chart that lists each of the identified weaknesses, which business or technical goal is impacted, and how the weakness can be eliminated in the proposed network design.


Example: