Solved

IP Address Assignments & Subnets

Posted on 2015-01-27
8
280 Views
Last Modified: 2015-01-27
I am studing IP addresses and subnetting. I recently took a test and there were two questions I couldn't answer. The file has the correct answers noted by a red dot by the correct answer.

My question is with the information presented in Question 14 & 15 how do you know you are creating "four separate" subnets. I think I understand assinging the system IP address of 172.17.0.1 as it is the first usable IP address after the 172.17.0.0 network.

What I mostly don't understand is how you know from the info presented do you have 4 subnets. Is there a way graph this out on paper?

I have the same question for question number 15.
Subnets.pdf
0
Comment
Question by:James Coats
  • 3
  • 2
8 Comments
 
LVL 9

Accepted Solution

by:
Trenton Knew earned 500 total points
ID: 40573471
using that subnet mask ( .192) creates 4 subnets because the third octet of the IP address has two bits that belong to the network.  
( I.E. 255.255.192.0 = 11111111.11111111.11000000.00000000 )

so on those two bits (the first is in the 128 bit, and the second is in the 64 bit:
00 = 172.17.0.0
01 = 172.17.64.0
10 = 172.16.128.0
11 = 172.16.192.0 (128+64)
0
 
LVL 9

Expert Comment

by:Trenton Knew
ID: 40573478
The way subnetting works, any address that falls into the same range belongs to the same subnet.

the first subnet would include all addresses from 172.17.0.1 - 172.17.63.254
the second subnet would include all addresses from 172.17.64.1 - 172.17.127.254
the third subnet would include all addresses from 172.17.128.1 - 172.17.191.254
the fourth subnet would include all addresses from 172.17.192.1 - 172.17.255.254
0
 
LVL 69

Expert Comment

by:Qlemo
ID: 40573484
The info given in the test is incomplete, and assumes classed subnetting. The default mask for 172.17.0.0 is /16 = 255.255.0.0 (a Class B network). Subnetting on that with 255.255.192.0 leads to the 4 subnets, as Trenton described.

But if you throw away the ancient classed subnet assumption, you can't tell which subnets. The first question for subnetting always is "what is my basic subnet mask", because you need to divide something into smaller parts, and you need that something ;-).

That might have been told in prior test questions, and I think it has been.
0
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 

Author Closing Comment

by:James Coats
ID: 40573496
OK thank you I see that now. It is a little confusing but that makes sense. I need to make some sort of work sheet to draw it out in a kind of picture / graph. From what you presented here I think I can do that.

So on the first bit (192) you would have IP addresses between 172.17.129 & .191 and on the second bit you would have IP address between 172.17.0.1 & .63 thus providing the 4 subnets you presented.
0
 

Author Comment

by:James Coats
ID: 40573506
Thank you Trenton & Olemo for your comments.  I was reading the first comment and didn't see yours. All the comments have been very helpful.
0
 

Author Comment

by:James Coats
ID: 40573677
Oemo,

I would like to ask a question related to this question but I don't see the option in this new EE. I searched EE and it said use the box at the bottom of the question but this doesn't look like that sort of thing to me. How would I ask a follow up?
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Losing network connectivity 8 100
Increase size of DHCP scope? 16 87
redistribute default route to EIGRP? 2 62
Secondary DC 3 67
A Cisco router can be configured as a DHCP Server. There are advantages and disadvantages in making your Cisco router work as DHCP Server. Almost all the features for windows DHCP can be configured on Cisco-based DHCP server. Some of the features me…
Configuring network clients can be a chore, especially if there are a large number of them or a lot of itinerant users.  DHCP dynamically manages this process, much to the relief of users and administrators alike!
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

832 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question