VLSM - Why one ip on WLAN links?

Hi,

I'm going through the CBT Nugget videos and I understand most of VLSM apart from when the author assigned only one ip address on the WLAN links.

Surely there should be should two ip address in each side between networks making a total of 8 instead of 3?

Thanks

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Comments

jtdk985

i think hes showing you the /30 range for the wan links, the one circled being 128-131 is the range of available ip's to use for the link.

i think it should really show 129-130 for the host range, since 128 is the subnet, and 131 is the broadcast.

someone correct me if im wrong

Varez IT

lon21,

I believe that jtdk985 is correct. The wide area network link in question is using the IP address range of 192.168.1.128/30 so it has two usable IP addresses (192.168.1.29-192.168.1.30) to be used for the interfaces on the WAN links.

Network ID: 192.168.1.28
Host ID's: 192.168.1.29-192.168.1.30
Broadcast: 192.168.1.31

Just remember that a /30 (255.255.255.252) is a block size of four IP addresses with two usable IP addresses. Does this answer your question?

lon21

Varez IT wrote: »

lon21,

I believe that jtdk985 is correct. The wide area network link in question is using the IP address range of 192.168.1.128/30 so it has two usable IP addresses (192.168.1.29-192.168.1.30) to be used for the interfaces on the WAN links.

Network ID: 192.168.1.28
Host ID's: 192.168.1.29-192.168.1.30
Broadcast: 192.168.1.31

Just remember that a /30 (255.255.255.252) is a block size of four IP addresses with two usable IP addresses. Does this answer your question?

Yes.

Excellent, I didn't see the '-' sign.

Thank You!

On a other note.

I'm going though the CBT videos, which books would you guys recommend. Todd Lammle Or Wendell Odom...?

Thanks

jtdk985

so far i prefer lammle, maybe odoms for some reference.. but i wont read through odoms book again. soooooo dull

lon21

jtdk985 wrote: »

so far i prefer lammle, maybe odoms for some reference.. but i wont read through odoms book again. soooooo dull

Does Lammle book contain the material to pass the exam?

CodeBlox

And lammle's seems to have more errors.

jtdk985

yes i have found a couple errors in lammles, but i do find it easier to learn the theory.. which is very important. i dunno, i guess its a toss up and preference.

like right now, the way lammles teaches route summarization, im gonna refer to odoms book to see what he says about it, and go from there. i think it will go into more detail about it

aordal

I personally read both and thought Wendell's was much better. Difference of opinion I guess.

lon21

tbh I only have a small budget to purchase one book.

Any recommendation? + also taking CBT Nuggets videos.

alan2308

lon21 wrote: »

tbh I only have a small budget to purchase one book.

Odom's book gets much more in depth, which is good if you're starting from zero, but it's a bit dry. Lammle's book is much more lively, a more entertaining read, though the level of detail isn't as good.

Google books has previews of each so you can see for yourself which writing style you prefer. You might also consider hitting Amazon for used copies. Now that Lammle's 7th edition is out, I bet you can find copies of the 6th pretty cheap. The test hasn't changed, so the 6th edition is still valid.

jtdk985

if you can only get one, i guess get odoms, you need something with lots of detail, and something that explains things well. if you have cbt nuggets, that just explains things pretty well. odom will fill in the detailed bits of it