Cisco – CCENT/CCNA R&S (100-105) – Public Vs Private IP Addresses, NAT/PAT, Reserved IPs .13
Thirteenth Video in a Series covering all elements of The Cisco Certified Entry Networking Technician (CCENT) 100-105 ICND1v3
Blueprint Section: Network Fundamentals
In this video we start with a overview of public IP addressing and why it is important public IP’s are globally unique, also touch on the difference between Static IP’s Vs Dynamic IP’s
Brief discussion around IANA and one of their jobs of keeping track of the unique public IP’s assigned to the RIR all over the world and how/why you would want to own your own IP’s rather than leasing from an ISP
After public we compare this to Private IP’s and touch on IETF and RFC 1918 then show some examples of where and why we need and use Private addressing along with a brief discussion of NAT/PAT
Lastly we review some reserved IP addresses.
-APIPA – Automatic Private Internet Protocol Address which is mainly a Windows function that provides DHCP autoconfiguration addressing. APIPA assigns a class B IP address from 169.254.0.0 to 169.254.255.255 to the client when a DHCP server is either permanently or temporarily unavailable.
– Loopback – An address that sends outgoing signals back to the same computer for testing. In a TCP/IP network, the loopback IP address is 127.0.0.1, and pinging this address will always return a reply unless the firewall prevents it.
-Default or unknown address – This is a 0.0.0.0 IP address and used if you do not have an IP i.e. a discover during the DHCP DORA process or a default gateway on a routing table
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