|
I understand binary and which bits are host bits and which network, but figuring out what the subnets are in half of the class B cases is where I get stuck.
|
#
?
Jan 26, 2013 06:58
|
|
|
|
| # ? Apr 25, 2024 13:47 |
|
|
Once you understand the binary portion of subnetting its pretty easy. /18 derp derp 11111111.11111111.11000000.00000000 Oh look 18 1s! OR 255.255.192.0 EDIT: So block size is 64, so first subnet , say with 10.10.0.0 is - 10.10.0.0 -> 10.10.63.255 is the first ip range . And the # of subnets it the masked bit count so 2**2 == 4. Handy link: http://www.warriorsofthe.net/cgi-bin/subnets.pl?network=10.10.0.0&bits=18 Sylink fucked around with this message at 08:29 on Jan 26, 2013 |
|
#
?
Jan 26, 2013 08:21
|
|
|
Can't believe people use classfull addressing still. Just to let know if you mention classes around a bunch of network engineers they'll probably laugh at you. What I'm saying is make sure you understand CIDR 
|
|
#
?
Jan 26, 2013 15:38
|
|
|
doomisland posted:Can't believe people use classfull addressing still. Just to let know if you mention classes around a bunch of network engineers they'll probably laugh at you. What I'm saying is make sure you understand CIDR I'm having the opposite issue. After so many years of not using classful addressing I'm having a hard time making my brain subnet the way Lammle/Cisco wants me to do it.
|
|
#
?
Jan 26, 2013 15:59
|
|
|
doomisland posted:Can't believe people use classfull addressing still. Just to let know if you mention classes around a bunch of network engineers they'll probably laugh at you. What I'm saying is make sure you understand CIDR Wait, I thought I was using CIDR, since I know about the slash notation and how it applies to the masks (the number of the slash is the number of on bits). That still doesn't help me when I have to subnet in the third octet.
|
|
#
?
Jan 26, 2013 17:58
|
|
|
hooah posted:Wait, I thought I was using CIDR, since I know about the slash notation and how it applies to the masks (the number of the slash is the number of on bits). That still doesn't help me when I have to subnet in the third octet. I was more commenting on people still saying 'Class A/B/C' which no one uses anymore and haven't forever. It's only use is for understanding legacy networking. Keep on using /XX for subnets.
|
|
#
?
Jan 26, 2013 19:21
|
|
|
That's all well and good, but it doesn't help me understand how to subnet an address that has host bits in the third octet.
|
|
#
?
Jan 26, 2013 19:59
|
|
|
doomisland posted:I was more commenting on people still saying 'Class A/B/C' which no one uses anymore and haven't forever. It's only use is for understanding legacy networking. Keep on using /XX for subnets. People conflate the two all the time. A common misconception is that anything/8 is a class A; anything /16 is a class B; and that anything/24 is a class C. Which is not the case.
|
|
#
?
Jan 26, 2013 20:43
|
|
|
hooah posted:That's all well and good, but it doesn't help me understand how to subnet an address that has host bits in the third octet. You should write everything out in binary to figure it out to understand it. You have your network mask and host mask. Your block range is your host mask digits being all 0's to being all 1's. As mentioned before you can figure out your ranges from the highest bit in your host mask. So if you have 172.16.0.0/19 your subnet is the following 11111111.11111111.11100000.0000000 The highest bit in the host mask is in the third octet and is the 5th (2^5 is 32) bit in it. Your netmask has 3 bits in the network mask in the third octet so you have 2^3 networks (which equals 8). So, now you have to figure out your boundaries which is just math. 172.16.0.0 - 172.16.31.255 | 10101100.00010000.00000000.00000000 - 10101100.00010000.00011111.11111111 172.16.32.0 - 172.16.63.255 | 10101100.00010000.00100000.00000000 - 10101100.00010000.00111111.11111111 172.16.64.0 - 172.16.95.255 | 10101100.00010000.01000000.00000000 - 10101100.00010000.01011111.11111111 172.16.96.0 - 172.16.127.255 | 10101100.00010000.01100000.00000000 - 10101100.00010000.01111111.11111111 172.16.128.0 - 172.16.159.255| 10101100.00010000.10000000.00000000 - 10101100.00010000.10011111.11111111 172.16.160.0 - 172.16.191.255| 10101100.00010000.10100000.00000000 - 10101100.00010000.10111111.11111111 172.16.192.0 - 172.16.223.255| 10101100.00010000.11000000.00000000 - 10101100.00010000.11011111.11111111 172.16.224.0 - 172.16.255.255| 10101100.00010000.11100000.00000000 - 10101100.00010000.11111111.11111111
|
|
#
?
Jan 26, 2013 20:44
|
|
|
I think I get my confusion - Lammle uses CIDR values, but subnets in a classful way. Is that correct? And if so, which way should I be most comfortable with for the Network+ test?
|
|
#
?
Jan 27, 2013 03:46
|
|
|
While we're talking subnetting, I have a dumb question. Watching CBT Nuggets, and the first example says you bought the IP 216.21.5.0 and want 5 networks (3 offices and the 2 wan links connecting them). The answer ranges are 216.21.5.0 - 216.21.5.31, 216.21.5.32 - 216.21.5.63, etc. But aren't those public IPs? So how does that work when assigning the addresses to servers and clients and such, aren't those ranges also public IPs that other people could own? From what I've seen it's usually private ip ranges like 10.0.0.0 - 10.255.255.255.
|
|
#
?
Jan 27, 2013 04:19
|
|
|
Ganon posted:While we're talking subnetting, I have a dumb question.
|
|
#
?
Jan 27, 2013 12:29
|
|
|
Passed the last OCP test (1Z0-053) last week. I don't think I've ever taken a test that was so much more in-depth than any of the training material I found for it. Luckily I've worked with the product a good bit and over-studied. Serious bitch of a test, if anyone is considering that cert track be absolutely SURE you are ready for that test.
|
|
#
?
Jan 28, 2013 00:46
|
|
|
How did you find OCA? I'm thinking about taking it soon.
|
|
#
?
Jan 28, 2013 02:24
|
|
|
Any SQL Server / DBA goons in this thread? I got my MCITP SQL 2008r2, and it took me until last year (2012) to get it done. Microsoft has rolled out a new exam structure. Now rather than MCITP being king poo poo, you have the MCSE. I'm still confused by all this. Basically Microsoft is offering "upgrading" exams that let you take your earlier credentials and upgrade them to the new credentials. It is laid out here. Anyway, I'm working on upgrading to SQL Server 2012. The new exams, while fewer in number, are much harder. The test assumes that you know everything about 2008r2, and then grills you on the new features. There still are general questions that are version independent. I wanted to give everyone a heads up about the new Microsoft credentials and the new upgrade exams.
|
|
#
?
Jan 29, 2013 21:24
|
|
|
I posted about MCSA a page or two ago. I wasn't interested in bothering with certs until recently, so I'm playing catch-up. Which 2012 exams have you taken so far and do you have any suggestions for focus areas/study resources?
|
|
#
?
Jan 30, 2013 02:14
|
|
|
I'm getting ready to start studying for CCENT and then onto CCNA. I think I have a handle on books and study videos but I'm starting to get a bit apprehensive about buying equipment for a study lab. Is it necessary to have one or would an emulator lab work? I think my biggest thing is that I'm not sure where to start when buying equipment.
|
|
#
?
Jan 30, 2013 21:01
|
|
|
You can get by with GNS3 and an old 2950.
|
|
#
?
Jan 30, 2013 21:15
|
|
|
I passed ICND1 with only a 2950 so it's definitely doable.
|
|
#
?
Jan 30, 2013 21:24
|
|
|
ToG posted:I passed ICND1 with only a 2950 so it's definitely doable. Thats what I did for passing it. Packet tracer works fine for what they cover on CCNA too.
|
|
#
?
Jan 30, 2013 21:32
|
|
|
Awesome, shelling out $400 wasn't something I really wanted to do right now.
|
|
#
?
Jan 30, 2013 21:44
|
|
|
$400?? you can get a 2960 for <$100 http://www.ebay.com/itm/290850651640
|
|
#
?
Jan 31, 2013 00:01
|
|
|
CrazyLittle posted:$400?? you can get a 2960 for <$100 I was looking at kits from different websites. I think the package I looked at had 3 routers and 3 switches. I ended up buying a 2950 for $30.
|
|
#
?
Jan 31, 2013 01:37
|
|
|
psydude posted:You can get by with GNS3 and an old 2950. I can run GNS3 fine with nothing but the correct IOS image. Why would you even need the 2950 (feels like I'm missing something very obvious)? The one thing that had me stuck for a day was getting the "cloud" or real connection to your PC to work. Note that if you have a wireless connection on your PC to router, you'll need to create a bridge with the loopback adapter and most importantly restart your PC. It sounds very simple but google searching for an answer did not help.
|
|
#
?
Jan 31, 2013 01:54
|
|
|
DropsySufferer posted:I can run GNS3 fine with nothing but the correct IOS image. Why would you even need the 2950 (feels like I'm missing something very obvious)? The switching portion of ICND2 has some things that can't be done with the switch card in the ISR IOS images. Lack of experience with switch configuration was one of the things that got me the first time I took it.
|
|
#
?
Jan 31, 2013 03:18
|
|
|
I recommend Cisco Learning Labs over GNS3 for the CCNA. Isn't a buggy POS, does switches, don't have to "acquire" IOS images  , provides scenarios so you aren't blindsided by exam objectives.
|
|
#
?
Jan 31, 2013 03:37
|
|
|
Contingency posted:I recommend Cisco Learning Labs over GNS3 for the CCNA. How expensive are those? Because I gathered he was trying to do it on a budget.
|
|
#
?
Jan 31, 2013 03:49
|
|
|
ICND2 is $50 for 90 days/25 hours. Although some might balk at a time limit, I only used up 10 hours when I took ICND2. $50 is cheaper than kit pricing, and certainly less than a retake. Seriously, it's this vs "I thought Cisco didn't care about Frame Relay/NAT/IPv6" during an exam. I took ICND1 after using the Cisco Press book to study with; I don't believe the ICND1 lab provides $50 of value over what the Cisco Press book offered with their practice exam.
|
|
#
?
Jan 31, 2013 04:11
|
|
|
psydude posted:You can get by with GNS3 and an old 2950. My professor is pretty adamant that Packet Tracer will be able to provide the switch and router functions that you would need to practice with in order to study for the CCENT and the CCNA.
|
|
#
?
Jan 31, 2013 22:53
|
|
|
b0ng posted:My professor is pretty adamant that Packet Tracer will be able to provide the switch and router functions that you would need to practice with in order to study for the CCENT and the CCNA. Packet Tracer is missing support for some commands (| is the one that jumps out for me) and also treats interface input differently than in IOS proper. I mean, Cisco built it for people studying for the CCNA, so yes it would work for that, but I could see people getting into bad habits from it. Checking configs using "hosts" is so much easier in Packet Tracer as long as you just need to ping stuff though, so that's nice. EDIT: Also it seems like when it tries to resolve a host if you misspell input in the console, it never actually times out and you have to "power cycle" the router instance. That's annoying as hell. Inspector_666 fucked around with this message at 06:52 on Feb 1, 2013 |
|
#
?
Feb 1, 2013 06:50
|
|
|
Packet Tracer does eventually time out, but it takes like 2 minutes or something ridiculous.
|
|
#
?
Feb 1, 2013 14:47
|
|
|
keseph posted:I posted about MCSA a page or two ago. I wasn't interested in bothering with certs until recently, so I'm playing catch-up. Which 2012 exams have you taken so far and do you have any suggestions for focus areas/study resources? I've taken the 70-457 and 70-458. Those are the first 2 of 4 upgrade exams. If you are starting out, you can get your MCSA with 70-461, 70-462, and lastly 70-463. Honestly, if you know databases, the 461 exam is all about queries. You get a lot of freebies by just knowing databse concepts like indexing, query writing techniques, relational integrity, etc. You do have to learn the MS features and you have to learn to use SSMS (SQL Server Management Studio [basically RDBMS]). 462 has some gimmies on that too. It is "the DBA" test. Know you backups and restores inside and out, and then fill out the rest with MS specific stuff. I took and passed the 2008 versions of 461 and 462.
|
|
#
?
Feb 1, 2013 19:19
|
|
|
b0ng posted:My professor is pretty adamant that Packet Tracer will be able to provide the switch and router functions that you would need to practice with in order to study for the CCENT and the CCNA. I passed CCENT and CCNA both first time only using packet tracer, hadn't touched a Cisco device beforehand.
|
|
#
?
Feb 2, 2013 00:21
|
|
|
So I'm about 90% of the way there, If I had the option I'd cancel my test and rebook for next week (but I'd probably lose my fee). ~ So this is for anyone who has passed ICND1/ICND2. Is there anything in particular I should pay attention to ICND2 for my last minute studies? I'm fairly confident on the IOS stuff and subnetting quickly. I've done a fair bit of routing, NAT and ACL. I'm most concerned about IPV6 and Frame Relay. I've only got one Serial link in my lab so I plan to practice today using GNS3. e: I managed to post-pone the test by switching test centres. I'd still appreciate the input but atleast I've bought myself a week or more ToG fucked around with this message at 11:53 on Feb 2, 2013 |
|
#
?
Feb 2, 2013 04:20
|
|
|
ROUTE costs $200? Ugggghhhhh.
|
|
#
?
Feb 2, 2013 16:29
|
|
|
CBT nuggets training is now 99/month. Not a bad deal.
|
|
#
?
Feb 2, 2013 22:32
|
|
|
psydude posted:ROUTE costs $200? Ugggghhhhh. I am about the schedule SWITCH and I know the feeling. I still have ROUTE to go and TSHOOT. But first, it would be nice if I could find a position where I am dealing with routing. Right now its mostly layer 2 stuff.
|
|
#
?
Feb 4, 2013 03:05
|
|
|
duck hunt posted:I've taken the 70-457 and 70-458. Those are the first 2 of 4 upgrade exams. If you are starting out, you can get your MCSA with 70-461, 70-462, and lastly 70-463. Honestly, if you know databases, the 461 exam is all about queries. You get a lot of freebies by just knowing databse concepts like indexing, query writing techniques, relational integrity, etc. You do have to learn the MS features and you have to learn to use SSMS (SQL Server Management Studio [basically RDBMS]). 462 has some gimmies on that too. It is "the DBA" test. Know you backups and restores inside and out, and then fill out the rest with MS specific stuff. I took and passed the 2008 versions of 461 and 462. I've been working with DBs for 4 years so I'm confident in my base knowledge, but it's asinine things like memorizing startup params that are a concern.
|
|
#
?
Feb 4, 2013 04:05
|
|
|
psydude posted:ROUTE costs $200? Ugggghhhhh. 
|
|
#
?
Feb 4, 2013 04:42
|
|
|
|
| # ? Apr 25, 2024 13:47 |
|
|
MC Fruit Stripe posted:The cost a certification is only relevant if you plan to fail it. The ROI is definitely there. Per my contract, once I get the CCNP I get an automatic $3,000 salary increase.
|
|
#
?
Feb 4, 2013 05:43
|
|