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Network Schematic Symbols

A network diagram is a map of the nodes and connections in a computer network. Some diagrams use small images of various network devices, but Cisco uses its own brand of networking icons. Cisco's icons are globally recognized and generally accepted as standard for network topology design.

Network server symbol A Server is a computer that shares files, software, hardware and other resources in a client-server network.

Computer workstation symbol A Workstation is a computer typically connected to a local area network and used by a person to run local or server business or technical applications.

Network hub symbol A Hub has multiple ports. A hub is the most basic networking device that, unlike a switch or router, has no routing tables. When a packet arrives at one port of a hub, it is copied to all other ports.

Network router symbol A Router has multiple ports, each port connected to a different network or subnetwork. A router has an internal routing table identifying which network or subnetwork is connected to which port. Using the destination address in an incoming data packet, using its routing table, it forwards the packet to the proper network or subnetwork.

Level 2 switch A Level 2 Switch has multiple ports, each port connected to a different network or subnetwork. A level 2 switch keeps a record of the MAC addresses of the devices connected to each port. When a data frame is received it looks at the MAC address in the frame and forwardsd the frame to the port connected to the device with that MAC address. Because the switch uses the MAC address it works at Layer 2, the Data-link layer of the OSI (Open Systems Interconnection) model.

Level 3 switch A Level 3 Switch has multiple ports, each port connected to a different network or subnetwork. Layer 3, the Network Layer of the OSI model is where IP addresses are part of the PDU (Protocol Data Unit), the packet. This allows a Layer 3 switch to perform some router functionality. The primary router function it would perform is IGMP (Internet Group Management Protocol) monitoring. With this, a Layer 3 switch can increase efficiency by delivering multicast group traffic only to ports where an attached device has signaled that it wants to be part of that group.

Network bridge symbol A Bridge connects two or more networks or subnetworks together. A bridge operates at level 2 of the OSI model, so it doesn't have access to IP addresses, and it can't perform routing. A bridge learns which nodes belong to each network or subnetwork and maintain a MAC address table. A bridge inserted into a network keeps traffic contained within the segments. It perfoms a function similar to a router, but since it operates at the data link layer. it does not analyze the data being forwarded. Because of this, bridges are faster at transferring data (but not as functional) as a router. Multiport bridges have more than two ports and perform a function like a network switch.

Network gateway symbol A Gateway is a device that acts as an exit point to another network. A gateway is capable of joining two networks that use different protocols. A router can act as a gateway. A default gateway is the node on the network that is used when a destination IP address does not match any routes in the network's routing table.

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