Solved

DHCP Scope

Posted on 2009-07-07
5
539 Views
Last Modified: 2012-08-13
can you tell me the DHCP scope, subnet mask by looking at something like 10.41.81.0/27?
0
Comment
Question by:miriggall
  • 3
  • 2
5 Comments
 
LVL 5

Assisted Solution

by:Ahmed Ezzat AbuRaya
Ahmed Ezzat AbuRaya earned 500 total points
ID: 24800241
If you mean the valid IPs in the subnet.. (10.41.81.1 - 10.41.81.30)
0
 
LVL 5

Assisted Solution

by:Ahmed Ezzat AbuRaya
Ahmed Ezzat AbuRaya earned 500 total points
ID: 24800244
/27 is 255.255.255.224
0
 

Author Comment

by:miriggall
ID: 24800314
I accept both your answers, but how do you know this.
0
 
LVL 5

Accepted Solution

by:
Ahmed Ezzat AbuRaya earned 500 total points
ID: 24800393
/27 is a CIDR notation (Classless Inter-Domain Routing). You can read more about it here: http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

*Basically* (/27) means you have 27 bits set as '1' in the subnet mask: (11111111.11111111.11111111.11100000) (all in binary) when converted to decimal you have (255.255.255.224)  (To convert binary to decimal: http://www.wikihow.com/Convert-from-Binary-to-Decimal)

You can play with (http://www.subnet-calculator.com/cidr.php) and read more about VLSM (variable length subnetting mask if you are interested. There are many tutorials about it (e.g. http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml)

For your network 10.41.81.0/27,  (/27 = block sizes of 32 users) so you have IP range of (10.41.81.0 to 10.41.81.31) .. First IP and last IP (10.41.81.0 & 10.41.81.31) are not valid IPs (e.g. You can't assign them to hosts) so you are left with valid IP range of (10.41.81.1 - 10.41.81.30).

There are just lots of details and I don't know how much deep you want to know :) The links I gave you provide more detailed information if  you are interested.

Hope this helps :)
0
 

Author Closing Comment

by:miriggall
ID: 31600928
Excellent timely response.  thanks
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

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!
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).

867 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now