Internet - computer networks joined via gateways that transfer and convert data
Intranet - technology used within a private network (organization, etc.)
Extranet - intranets restricted to certain audiences outside the organization (vendors, etc.)
Front-End Networks: connect stations and servers
Back-End Networks: connect peripherals
Backbone Networks:
network other networks connect to;
connects between LANs and WANs;
users not connected direct to Backbone;
connect via access networks (bridge, router, gateway);
optical fiber and micro wave links used
Network Interface Cards (NIC):
circuit boards used to communicate between PC and LAN
Security device to protect internal network from unauthorized access by external network
An application level traffic monitor and access control device
Can detect and log any or all activity over time
Provides security between LAN and WAN
Provides internal security between LANs
Controls & monitors external access
Prevents unauthorized access to LAN via WAN
Allows transparent LAN access to WAN
Typically, between internet (external network) and internal network
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