WARNING: This site is intended for online use only; mass-downloading of pages degrades the server and is prohibited.
If you attempt to use tools to mass-download the site, you may be blocked permanently by automated software.
If you want to read this CertiGuide offline, please use one of the links on the left to purchase a convenient PDF copy. Thank you.

Get the A+ 4 Real e-book for your own computer.
Click Here!

Custom Search






Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 13: Basic Networking Terminology
      9  OSI Reference Model and Networking Protocols and Technologies
           9  Layer 3 - Network Layer

Previous Topic/Section
Class C
Previous Page
Pages in Current Topic/Section
1
Next Page
Static Addressing
Next Topic/Section

Subnet Mask

The subnet mask is not an address But it determines, which part of the IP address is the network field and which part is the host field. A subnet mask is 32 bits long and has 4 octets just like an IP address, for example 255.255.255.0(/24).

There are certain addresses in each class of IP address that are not assigned. These addresses are called private addresses. Private addresses might be used by hosts that use network address translation (NAT) or a proxy server to connect to a public network; or, by hosts that do not connect to the Internet at all.

The private addresses can be used together with a network address translation (NAT) server. Either a NAT server or a proxy server provides connectivity to all hosts in a network that has relatively few public addresses available. By agreement, any traffic with a destination address within one of the private address ranges will NOT be routed on the Internet.

After determination of the addressing scheme, the method for assigning addresses to hosts needs to be chosen. There are essentially two methods for assigning IP addresses - static addressing and dynamic addressing. Regardless of addressing scheme, no two interfaces can have the same IP address.


Previous Topic/Section
Class C
Previous Page
Pages in Current Topic/Section
1
Next Page
Static Addressing
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 A+ (A+ 4 Real) from StudyExam4Less.com. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

CertiGuide to A+ (A+ 4 Real) (http://www.CertiGuide.com/apfr/) on CertiGuide.com
Version 1.0 - Version Date: March 29, 2005

Adapted with permission from a work created by Tcat Houser et al.
CertiGuide.com Version Copyright 2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.