Cisco Training CCNA IP Addressing - Part 6

Comments on 'Cisco Training CCNA IP Addressing - Part 6'

1. I understand the process but where does the value of the
   Magic number come from ? is it always 256 for working with
   the last octec of the mask or would if change if 240 was
   different?
2. i am a little confused at first, so I go back and watch the
   video again, and wahla, It makes 75% sense to me (It is hard
   for me to concentrate, so getting 75% comprehension from me
   is very freaking impressive).
3. Small caveat - this trick is gr8 only for the third
   octet...if the scenario is subnetting in second octet, it's
   slightly different ball game !!
4. Wow
5. Full marks - your vids are great.
6. wow good point
7. I'll be damned if this guy doesnt make sense. I am
   officially impressed
8. i never comment on videos... but i wanted to say thank you
   very much for doing all of this. Ive watched all your videos
   and each one help me a bit more than the last. Thank you!
9. Thanks. After some practice for question like this you can
   give answer in less than 20 sec. So whoever is thinking its
   too hard its not after some practice. So guys, goodluck with
   it.
10. In many cases you can get away with using .48 as a
    host. The routers will just forward the packets to .48 to
    the right network, so it's a matter of whether the host
    itself is fussy or not. If the host is fussy and refuses to
    allow you to give it a "network address", you might be able
    to sacrifice connectivity with "neighbouring" addresses by
    setting an incorrect 255.255.255.224 mask.
11. Not E, because it is part of 32 subnet, not the 48 subnet
    segment that 172.16.12.54 is from.
12. Host Range is: 48 --> 63 with : 1. 48 ... as Network base
    Adress 2. 63 ... as Broadcast Adress anynumber above belongs
    to Network & between is Host ! right ? or .. left ?? =)
13. that's amazing ! =) guys you may have to use the calc a
    paper & practice it ;) thank you again for these vids ;)
14. Ah, much thanks. I understand what he means now. True, its a
    good trick.
15. His "Trick" is ever simpler, just subtract your last octet
    - .240 from the Magic number "256" and you get 16, this
    number represents the number of "Steps" in which the subnets
    increment. So subnets would be 16,32,48,64 etc... However we
    know that the numbers 16, 32, 48, 64 etc... are the Subnet
    which means the number preceding it will be the broadcast
    address for the preceding subnet, so .16's broadcast addy is
    .32, and we know neither of these are valid as hosts. So .54
    is in the range .49-.62
16. drakezen & DnSavior , .240 gives you a Subnet of .48, here's
    how long way - When you "Logical AND" 172.16.12.54 &
    255.255.255.240 you get 172.16.12.48, that is you "logical
    AND" 10101100 00010000
    00001100 0011 0110 & 11111111 11111111 11111111 1111 0000
    - 10101100 00010000 00001100 0011 0000 which
    translates to decimal to 172.16.12.48. Put all 1's in for
    the Host portion and it gives you -172.16.12.63 (Broadcast)
    so range is .49 - .62
17. I am confused as well. Is not te answer, B, C, and E?
18. If the mask is 240 and the ip address is 172.16.12.54
    wouldn't that give a subnet host range of 172.16.12.48 to
    172.16.12.54? with 172.16.12.55 being the broadcast
    address. So how would 172.16.12.64 be a valid host address
    with this range using that mask? The question is what are
    the valid hosts with that mask? I dont think I understand
    why you are showing what possible subnets are possible.
19. I listened to a guy who said we shouldn't use "tricks"
    because of blah blah....but on the test i just took,
    converting to binary really screwed me time wise. This trick
    is good, and thanks to this guy i wont spend a ridiculous
    amount of time converting crap during the test.
20. OMFG YOU ARE MY HERO! Thank you!
21. thanks for taking the time to do these..especially the
    "trick". I understand it now!! 5 Stars!
22. thanks a lot to post exmaples. it really helps me to
    understand much better. I wish my teacher could explain
    subneting like you..
23. This is great. Makes me want to learn more from your videos.
    Everything sinks in after the second watch.
24. Thanks for the post.
25. Thanks for your videos! Your explanations actuallly make
    sense! This method is great!