That made more sense to me than my CCNA instructor. Jaime Solorza On Nov 10, 2015 10:31 AM, "Ken Hohhof" <[email protected]> wrote:
> We should probably get rid of the term “subnet” and just tell people the > netmask tells you how many of the 32 bits in the (IPv4) address specify the > network, with the remaining bits specifying the host. The idea of > network/subnet/host goes back to pre-CIDR days. > > It doesn’t take long before you instinctively know to subtract from 256. > So for a 255.255.255.248 netmask, you subtract 248 from 256 and get 8 which > is the number of host addresses. Or if you are dealing with slash > notation, /29 means the first 29 of the 32 bits specify the network, so the > remaining 32-29=3 bits specify the host. And 2^3=8 is the number of > possible host addresses in that network. > > The concept of network and broadcast address is a little trickier, because > it depends on how the IP block will be used. If it’s not an actual LAN > (like maybe being assigned as individual /32 routes via PPPoE), they are > usable, but it may confuse people. > > > *From:* Justin Wilson - MTIN <[email protected]> > *Sent:* Tuesday, November 10, 2015 11:15 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] Subnetting and TCP/IP Intro > > There are some good CCNA videos on Youtube about subnetting. Subnetting > is like the old multiplication tables in school. If you memorize what > subnet mask corresponds to, say a /29, then you are ahead of the game. > Getting down into the binary aspect of it is helpful in about .01% of all > troubleshooting on a non-programmer level. If we go back to our math > analogy the only place most folks don’t use calculators is on tests. Same > with subletting. There are subnet calculators out there for you to use. > As long as you understand the fundamentals and know whats going on you > don’t have to do all the work manually. > > The short answer is, even for the mikrotik tests, tell your employee to > google “CCNA subletting” on youtube. Lots of good videos in the first 10 > choices. After that have them learn the 7 layer OSI model. > https://www.youtube.com/watch?v=l_OPR2yh2co > > > > > Justin Wilson > [email protected] > > --- > http://www.mtin.net Owner/CEO > xISP Solutions- Consulting – Data Centers - Bandwidth > > http://www.midwest-ix.com COO/Chairman > Internet Exchange - Peering - Distributed Fabric > > > On Nov 10, 2015, at 11:17 AM, Josh Luthman <[email protected]> > wrote: > > Pretty sure this is the site that Butch himself recommended ages ago: > http://www.tcpipguide.com/ > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > On Tue, Nov 10, 2015 at 11:14 AM, Matt <[email protected]> > wrote: > >> Have an employee we plan on sending to Mikrotik MTCNA training in next >> month or two. Prerequisites state: "The student must have a good >> understanding of TCP/IP and subnetting". >> >> Are there some good online youtube or other free sources for this that >> anyone here recommends? >> > > > >
