Network stencils
Formal Network Symbols
This is an excellent stencil set of formal network symbols, for when the poofy internet cloud simply isn't enough. Oh wait — the poofy internet cloud is still there, hiding behind the moniker of "Network Cloud". That seems formal, maybe not black tie, but pretty formal.
Cisco Stencils (Machines)
Collection of hosts, clients and assorted support.
Cisco Stencils (Net management)
Various types of probes and management hosts.
Cisco Stencils (Wireless)
WLANs, RF, etc.
Cisco Stencils (Security)
Firewalls, VPNs, etc.
Mac ADSL
The MacADSL team has designed a network stencil that can be used to draw networks in a comprehensive way with few colors in order to generate small image files to be published on the web.
Cisco Stencils (Services)
Group of conceptual and functional icons.
Basic Cisco Icons
Falk Stern took a set of the basic Cisco router and switch icons for Visio and created a handy OmniGraffle stencil set out of them. Firewalls, routers, switches and even the ubiquitous internet cloud are all available.