Auditing the Internet, E - Business

INTERNET VS. INTRANET VS. EXTRANET

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.) NETWORK CONNECTIONS 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 WHAT IS A FIREWALL? 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 WHY HAVE A FIREWALL? 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 WHERE SHOULD A FIREWALL BE PLACED? Typically, between internet (external network) and internal network Contact Us Home / About Us / Services / Newsletter IT Audit / Pre-QAR / CIA / 1 Stop IA Shop / IA Manual Audit Services Tel:615-790-9858 PO Box 681387, Franklin, TN 37068