Cisco – CCENT/CCNA R&S (100-105) -IPv4 Overview, Classful & Binary .10
Tenth Video in a Series covering all elements of The Cisco Certified Entry Networking Technician (CCENT) 100-105 ICND1 v3
Blueprint Section: Network Fundamentals
In this video we start with an overview of IPv4,
IPv4 addresses are 32 bits long broken up into 4 octets and represents in dotted decimal format. Each octet can be anything from 0 up to 255 and IP as a protocol is:
-Unreliable – Delivery is not guaranteed, a packet may be lost, duplicated, delayed or delivered out of order
-Connectionless – Each packet is treated independently from all others. A sequence of packets sent from one computer to another may travel over different paths, or some may be lost while others are delivered
-Best-effort – Networks make the earnest attempt to deliver the packet, that is the network does not discard packets capriciously; unreliability arises only when resources are exhausted or underlying networks fail
We then move onto Classful addressing discussing that there are 5 classes, Class A, B, C, D and E.
Using network ID bits (Most significant bits in the first octet) PCs/devices are able to identify which IPs/Networks relate to which IP classes and in turn which network/host bits they need to be aware of in order to achieve communication.
We then had a overview of how binary is translated into decimal then decimal into binary..
Lastly we said, since most companies needed more then 254 IPs class C wasn’t enough and class B gave over 65,000 IPs which were too many, there needed to be another method which allowed IPs to broken further than what is offered with the classful method. This is where the classless & Subnetting elements came into play
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