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Private Networks, VPNs, and NAT: Ensuring Privacy and Communication

This chapter covers private networks, virtual private networks (VPNs), and network address translation (NAT), all of which play vital roles in ensuring privacy and effective communication within organizations. Topics include intranet, extranet, VPN technology, tunneling, and NAT translation.

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Private Networks, VPNs, and NAT: Ensuring Privacy and Communication

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  1. Chapter 26 Virtual Private Networks and Network Address Translation Objectives Upon completion you will be able to: • Understand the difference between an internet and an extranet • Understand private, hybrid, and virtual private networks • Understand how VPN can guarantee privacy • Understand the mechanism of NAT TCP/IP Protocol Suite

  2. 26.1 PRIVATE NETWORKS A private network is designed to be used only inside an organization. It allows access to shared resources and, at the same time, provides privacy. The topics discussed in this section include: Intranet Extranet Addressing TCP/IP Protocol Suite

  3. Table 26.1 Addresses for private networks TCP/IP Protocol Suite

  4. 26.2 VIRTUAL PRIVATE NETWORKS (VPN) Virtual private network (VPN) is a technology for large organizations that use the global Internet for both intra- and interorganization communication, but require privacy in their intraorganization communication. The topics discussed in this section include: Achieving Privacy VPN Technology TCP/IP Protocol Suite

  5. Figure 26.1Private network TCP/IP Protocol Suite

  6. Figure 26.2Hybrid network TCP/IP Protocol Suite

  7. Figure 26.3Virtual private network TCP/IP Protocol Suite

  8. Figure 26.4Tunneling TCP/IP Protocol Suite

  9. Figure 26.5Addressing in a VPN TCP/IP Protocol Suite

  10. 26.3 NETWORK ADDRESS TRANSLATION (NAT) Network address translation (NAT) allows a site to use a set of private addresses for internal communication and a set of global Internet addresses for communication with another site. The site must have only one single connection to the global Internet through a router that runs NAT software. The topics discussed in this section include: Address Translation Translation Table NAT and ISP TCP/IP Protocol Suite

  11. Figure 26.6NAT TCP/IP Protocol Suite

  12. Figure 26.7Address translation TCP/IP Protocol Suite

  13. Figure 26.8Translation TCP/IP Protocol Suite

  14. Table 26.2 Five-column translation table TCP/IP Protocol Suite

  15. Figure 26.9An ISP and NAT TCP/IP Protocol Suite

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