31 Days Before your Cisco Certified Support Technician (CCST) Networking 100-150 Exam: A Day-By-Day Review Guide for the CCST-Networking Certification Exam

Day 22

Private Addressing and NAT

CCST Networking 100-150 Exam Topic

• 2.1. Compare and contrast private addresses and public addresses.

  • Each IP address must be unique on the network

Key Topics

To cope with the depletion of IPv4 addresses, several short-term solutions were developed. One short-term solution is to use private addresses and network address translation (NAT). Although not explicitly called out in the exam objectives, NAT is why networks can use a private IP addressing scheme and still be able to communicate with other networks, some of which might be using the exact same addressing. Today we review private addressing and NAT.

Private Addressing

RFC 1918, “Address Allocation for Private Internets,” eased the demand for ...