Network Infrastructure Devices and Icons used in network diagrams

Network Infrastructure devices are the physical components used to build the computer network. Depending on the size of the enterprise network, different models of different capacity and quantity of network infrastructure devices are used in the network.

It is necessary to understand and perceive below network device icons, because network topology diagrams use these icons to represent network devices. These icons were originally designed by Cisco Systems, but accepted globally as standard network topology device icons today.

Please note that below list is not the complete list of network topology diagram icons. Below devices and their icons are only the important icons used in network topology diagrams. Please click following link if you want to download complete network device icons used in network topology diagrams from Cisco website.

Following table lists important devices in a computer network. If you are a beginner, some devices may not be familiar. We will discuss about those unfamiliar devices in future lessons.




Hub Ethernet Hub
Modem Modem
Cable Modem Cable Modem
Fax Fax
Bridge Bridge
Wireless Bridge Wireless Bridge
Layer 2 Switch Layer 2 Switch
Voice Switch Voice Switch
Multi-layer Switch Multi-layer Switch
Layer 3 Switch Layer 3 Switch
Router Router
Router with Firewall Router with Firewall
Netflow Router Netflow Router
Storage Router Storage Router
Wireless Routers Wireless Router
Voice Router Voice Router
PC Software PC Software
Workstation Workstation
Laptop Laptop
Directory Server Directory Server
File Server File Server
Web Server Web Server
Web Browser Web Browser
Cellular Phone Cellular phone
Phone Phone
IP Phone IP Phone
Tower Server Tower Server
Firewall (General) Firewall
Cisco IOS Firewall Cisco IOS Firewall
Cisco PIX Firewall Cisco PIX Firewall
Cisco ASA Firewall Cisco ASA Firewall
Cisco Secure ACS Cisco Secure ACS
Cisco ISE Cisco ISE
Ethernet Network Segment Ethernet LAN Segment
WAN Link WAN Link
Related Tutorials
Introduction to Computer Networking
Responsibilities of a network engineer
What is a Computer Network?
Why we need computer networks?
Different types devices used to create a computer network
Client Operating Systems and Network Operating Systems (NOS)
Common Network Application Software
Local Area Networks (LAN) and Wide Area Networks (WAN)
Campus Area Networks (CAN) and Metropolitan Area Network (MAN)
Logical Classification of Computer Networks - Peer to Peer Networks and Client/Server Networks
Logical Classification of Computer Networks - Centralized and Distributed Computer Network Models
Internetworks, Internet, Intranet and Extranet
What is a Network Protocol
Difference between Proprietary and Standard Protocols
What are RFCs (Request for Comments)
Organizations which control Internet, Network Protocols and Standards
What is network topology
Difference between physical topology and logical topology
Network Topologies - Bus Topology
Network Topologies - Star Topology
Network Topologies - Mesh, Ring and Hybrid Topologies
Network Topologies - Partial-Mesh Topology
Network Topologies - Full-Mesh Topology
Advantages and disadvantages of full-mesh topology
Network Topologies - Ring Topology
Network Topologies - Dual Ring Topology
Network Topologies - Hybrid Topology
Network Topologies - Tree Topology
Point-to-point Topology and Point-to-multipoint Topology
What are wireless networks? Advantages and disadvantages of wireless networks.
Ad hoc Wireless Topology
Infrastructure Wireless Topology
Wireless Mesh Topology
Network Infrastructure Devices - What is a Hub?
Network Infrastructure Devices - What are Bridges and Switches?
Network Infrastructure Devices - What is a Router?
Network Infrastructure devices - What is a Firewall
Main office (Head Office) and Branch Office Networks
Site-to-Site Network Topologies - Hub and Spoke Toplogy
Site-to-Site Network Topologies - Partial-Mesh Toplogy
Site-to-Site Network Topologies - Full Mesh Topology
What is NIC (Network Interface Card)
Common Network Cable types
Differences between STP and UTP twisted pair cables
Twisted pair cable bandwidth and frequency range
Different types of shields used in STP (shielded twisted pair cable)
TIA/EIA 568A and TIA/EIA-568B standards
Straight-Through and Cross-Over cables
What is Auto-MDIX feature in ethernet switches
Difference between Baseband and Broadband
Network Access Methods - CSMA/CD, CSMA/CA and Token Passing
IEEE (Institute of Electrical and Electronics Engineers)
IEEE 802 Standards
IEEE 802.11 Standards
LAN Technologies - Ethernet
Ethernet Media Standards
100Base-TX Ethernet Media Standard
100Base-FX Ethernet Media Standard
4D-PAM5 encoding in Gigabit Ethernet
1000Base-T Ethernet Media Standard
1000Base-SX Ethernet Media Standard
1000Base-LX Ethernet Media Standard
10GBase-T 10 Gigabit Ethernet Media Standard
10GBase-SR 10 Gigabit Optical Fiber Ethernet Media Standard
Meaning of 10/100/1000 Ethernet
Twisted pair Cable categories for 1 Gigbit and 10 Gigabit networks
Broadband over Power Line (IEEE 1901-2010 standard)
What is Power over Ethernet (PoE)
What is PoE (Power over Ethernet) Switch
LAN Technologies - Token Ring
Advantages and disadvantages of Fiber optic cable
Structure of fiber optic cable (FOC)
Single Mode Fiber Optic Cable (SMF fiber cable)
Multimode Fiber Optic Cable (MMF fiber cable)
Different types of fiber optic cables
Fiber optic transceivers
Fiber optic connectors
LAN Technologies - Fibre Distributed Data Interface (FDDI)