4 ms·
Personally, when I was trying to wrap my head around CIDRs for the first time, thinking about IPs at one 32 bit number (a la hex formatting) was super helpful,
by bragr 4y ago
Personally, when I was trying to wrap my head around CIDRs for the first time, thinking about IPs at one 32 bit number (a la hex formatting) was super helpful, and makes it less annoying to leave behind the nice /8 /16 /24 chunks. Thinking of terms of just bitmasks is also pretty straight forward in the end.
- macintux 4y agoI gave a class on TCP/IP to other consultants in my company 20 years ago. The day went well right up until the end when I covered bitmasks, at which point eyes universally glazed over. Lesson learned: always save that topic for last, so the rest of the day isn’t a disaster.
- NoZebra120vClip 4y agoIn community college not 5 years ago, I took the first two of a series of Cisco networking classes designed to prep for certifications such as CCNA. When we came upon CIDR and VLSM, our instructor (very knowledgeable, down-to-earth, pragmatic) introduced us to various calculators that could assist us, although he did also show us a manual way to graph out each bit. Then he admitted that the VLSM portion of the class had often driven his previous students to tears, and he didn't want to see anyone crying over this anymore.