Screened Subnet Architecture andFirewalls A firewall’s function is to act as a gatekeeper, keeping Internet “bad guys” out of your internal network. Setting up an effective firewall requires careful planning. In my view, the Screened Subnet Architecture is a preferred network setup for firewalls to protect your company’s network while at the same time allowing […]
Buffer Overflow refers to what happens when an area of a program’s code is overwritten with new code using the technique of inputting data longer than the length expected when the program asks for input. This creates an overflow in the program’s buffer system, and causes the program to react negatively − sometimes even resulting […]
The Domain Name System (DNS) relies on a hierarchical database system. At the top of this system sit thirteen root servers with names following the format letter.root-servers.net, where the letter ranges from A to M. Many people mistakenly assume that there are only 13 root servers in the world. In fact, each root server notation […]
What does the name Trojan Horse imply in way of network security, and what threats do Trojan Horses bring to a network computing system? First let’s look at history to understand the name “Trojan Horse.” The Trojan War, as you may already know, is the ancient war between the Greeks and the city of Troy […]
What are RADIUS AAA Servers? According to Convery, S.(2007)1: “RADIUS was developed by Livingston Enterprises (now part of Alcatel-Lucent) in the early 1990s, became an Internet standard through the IETF in 1997, and today is the most widely accepted AAA protocol. Another widely adopted AAA protocol, which predates RADIUS as an RFC by four years, […]
PPTP port belong to Point-to-Point Tunneling Protocol (PPTP). PPTP is a method for implementing virtual private networks that works on the data link layer. It serves the purpose of encrypting a remote computer’s network traffic to a host using Point-to-Point Protocol’s (PPP’s) authentication methods of PAP (Password Authentication Protocol) or CHAP (Challenge-Handshake Authentication Protocol). It […]
