Ravindra BagaleCourses & study guides

1. IP Addressing: IPv4, Subnets, Public and Private IPs

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Chala mitrano, aaj aapan cyber security cha pahila dagad thevuya – IP address. Hacker aso kiwa defender, pahila prashna nehmi ekach asto: "target kuthe aahe?" Tyache uttar mhanje IP address. Aaj aapan IPv4, classes, CIDR, subnetting, static aani dynamic IP, public aani private IP aani NAT shiknar aahot. Pen aani paper ghya, fakt vachu naka – calculation swatah kara. Ekdum simple aahe, fakt dhyan dya.

What you will learn in this chapter

  • What an IP address is and how an IPv4 address is built (32 bits, four octets)
  • IPv4 classes A–E, loopback, and why classes were replaced by CIDR
  • CIDR notation, subnet masks and basic subnetting (network, broadcast, usable hosts)
  • Static vs dynamic IP and how DHCP hands out addresses (DORA)
  • Public vs private IP (RFC 1918) and NAT (नेटवर्क पत्त्याचे भाषांतर)
  • Why each of these matters for security

Concepts in this chapter

  1. 1.1What Is an IP Address?
  2. 1.2IPv4 Structure: Bits, Octets and the Subnet Mask
  3. 1.3IPv4 Classes (A to E) and Loopback
  4. 1.4CIDR Notation and Subnet Masks
  5. 1.5Subnetting Basics (Worked Example)
  6. 1.6Static vs Dynamic IP and DHCP
  7. 1.7Public vs Private IP (RFC 1918)
  8. 1.8NAT (Network Address Translation)

The chapter recap is at the end of the last concept page.