Introduction to Firewalls. © N. Ganesan, Ph.D. Overview. Overview of Firewalls. As the name implies, a firewall acts to provide secured access between two networks A firewall may be implemented as a standalone hardware device or in the form of a software on a client computer or a proxy server
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© N. Ganesan, Ph.D.
Local Area Network
TCP Port Number
Domain Name System (DNS) Name Queries
FTP (Data Channel)
Trivial File Transfer Protocol (TFTP)
FTP (Control Channel)
NetBIOS name service
NetBIOS datagram service
HyperText Transfer Protocol (HTTP) used for the World Wide Web
Simple Network Management Protocol (SNMP)
NetBIOS session serviceWell-know TCP / UDP ports