From the course: ISC2 Certified Information Systems Security Professional (CISSP) (2024) Cert Prep

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Public and private addressing

Public and private addressing

From the course: ISC2 Certified Information Systems Security Professional (CISSP) (2024) Cert Prep

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Public and private addressing

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- [Instructor] As we've discussed throughout this course, IP addresses uniquely identify systems on a network. TCP/IP-compatible devices use these addresses to correctly route packets across networks, but how are those addresses originally assigned? Well, IP addresses come in two forms: public addresses, which are assigned by a central network authority and may be used to reach systems located across the internet; and private addresses, which are available for anyone's use, but may only be used on local networks and will not work across the internet. Let's begin by discussing public IP addresses. These addresses are centrally managed by a group known as the Internet Corporation for Assigned Names and Numbers, or ICAN. ICAN breaks addresses up into blocks and gives them out to regional authorities in different countries for distribution. These regional authorities each take responsibility for a specific geographic area of the world. For example, the American Registry for Internet…

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