Chapter 7 - External Network Connections

Abstract

There are many choices to be made when considering Internet access for a network. The type of Internet access that will best suit the needs and the budget must be determined—whether it is dial-up, ISDN, leased line, or one of the newer technologies such as cable and ADSL modems. Each method has advantages and disadvantages, which can vary depending on the needs and location. Some of the access methods, such as cable and ADSL modems, are not currently available in all areas, but will be available in most metropolitan areas soon. Windows 2000 has several Internet connection technology improvements, including NAT functionality in RRAS, a new VPN based on RFC-standard technologies, IPSec, Internet Connection Sharing, and more. Establishing a secure and functional connection to the Internet is easier than ever, and many organizations will be using Windows 2000 to provide secure services to remote users. A permanent Internet connection brings with it the potential for hackers to access the network from their own homes. It is extremely important that network administrators understand the various types of attacks that can occur to disrupt services or gain unauthorized entry. They need to understand the defenses that must be implemented to protect against each type of attack. While some defenses are implementations of applications such as proxy servers and network encryption, other defenses include policies, procedures, education, and simply locking doors.