Read this whole guide offline with no ads, for a very low price!
Click Here!
Use coupon code "certiguide" to save 20%!
(Expires 2004/12/31)

NEW! Network+ N11-003 2005 Beta Exam Study Guide - Just $9!
Get It Here!

Custom Search







Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP
      9  III  IP Address Details

Previous Topic/Section
III  IP Address Details
Previous Page
Pages in Current Topic/Section
1
Next Page
Class B
Next Topic/Section

Class A

If the very first number of the 32 binary digits is set to 0, this is a Class A address. The common subnet mask is 255.0.0.0. The subnet mask is a shorthand way of telling both the network admin, and the underlying innards of TCP/IP, how much of the address is used for the network (or subnet) number, and how much is used for the host number. The subnet number 255 hides the first 8 bits of the address so it used for the network number. This becomes the unique network number that can range between 001.n.n.n and 126.n.n.n. If you look at the binary math, you see it is possible to create the number 127, however that number as a reserved meaning in TCP/IP. The last 24 bits are available for separate clients. While Class A networks have the fewest network numbers, they have the possibility of supporting the most client devices.

Each network address class has a range of private network addresses or ID’s, reserved for use on networks without a direct connection to the Internet. In order to receive a public IP address, an individual or organization must acquire it from their ISP or from the administrators of the Internet. What if an organization isn’t connected to the Internet, or only allows a limited number of users to connect to it? They don’t need a public network address, if all they want to do is allow their internal users to communicate with each other. So, TCP/IP reserves a range within each address class for this purpose.

Address Allocation for Private Networks

Address allocation for private networks is described in more detail in RFC 1587.


 

In Class A, the reserved private network range is 10.0.0.0 – 10.255.255.255.

Class A

Be familiar with the fact that IP ranges in Class A addresses are 1-126, and the default subnet mask is 255.0.0.0 Hosts can range from n.0.0.1 to n.255.255.254.



Previous Topic/Section
III  IP Address Details
Previous Page
Pages in Current Topic/Section
1
Next Page
Class B
Next Topic/Section

If you find CertiGuide.com useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider buying an inexpensive PDF equivalent of the CertiGuide to Network+ from StudyExam4Less.com. (Use coupon code "certiguide" by December 31, 2004 to save 20%!) Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

CertiGuide for Network+ (http://www.CertiGuide.com/netplus/) on CertiGuide.com
Version 1.0 - Version Date: November 7, 2004

Adapted with permission from a work created by Tcat Houser and Helen O’Boyle.
CertiGuide.com Version © Copyright 2004 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.