have you hugged your OSI model today…

osi

it never goes away… if you think you have it backwards and forwards, you should think again…

ip header

ipheader

tcp segment header

tcpsegment

udp header

udpheader

i remember years ago when starting out with ccna thinking, i don’t really need to memorize all this, right? a functional knowledge is good enough right? nope… not even close…