What is the Windows Virtual Memory (page file)

What is the Windows Virtual Memory (page file) and what does it do?
The Windows Virtual memory is a place allocated on your hard drive (usually somewhere in the middle of the free space) that windows stores extra data from your RAM banks when that data isn;t being immediately used but may be needed in the near future. By default this file is not static and can grow or shrink within certain system-set limits. On most systems this is absolutely critical to system performance, but on higher end machiens with large memory banks it can actually slow the system up.

Well known Port Numbers

 21     FTP -- Control
22     SSH Remote Login Protocol
23     Telnet
25     Simple Mail Transfer Protocol (SMTP)
53     Domain Name System (DNS)
67      DHCP Clint
68      DHCP SERVER
80       HTTP
110     POP3
143     Interim Mail Access Protocol (IMAP)
389     Lightweight Directory Access Protocol (LDAP)
443     HTTPS
546     DHCP Client
547     DHCP Server

Clear or delete APR Cache

When you haven’t problem connecting to Internet where connections to websites or web pages will time out or fail, and unable to surf or browse the Internet pages, the error may because also of ARP cache corruption

Use the NetShell (netsh) command to clear, delete or refresh the Address Resolution Protocol (ARP) 

netsh interface ip delete arpcache

Google Chrome Offline Installer

 Click bellow link to google chrome offline installer

http://dl.google.com/chrome/install/648.11/chrome_installer.exe

Laptop problem Plugged in, not charging

Understanding battery charging issues If the notebook battery is not charging or the notebook does not indicate that the battery is charging, the most likely scenario is that the battery itself is operating correctly, but its power management software may have become corrupt. In order to correct the problem, you will need to uninstall and reinstall the power management software by using the Device Manager. This document will explain how to uninstall and reinstall the ACPI Battery listings in Windows Vista, as well as how to obtain and install updated BIOS files, if needed to correct other battery issues. Uninstalling and reinstalling power management software in Windows Vista In order to correct problems with the battery's power management software, follow the steps below.

1.
Click Start and type device in the search field, then select Device Manager .
2.
Expand the Batteries category.
3.
Under the Batteries category, right-click the Microsoft ACPI Compliant Control Method Battery listing, and select Uninstall .
WARNING: Do not remove the Microsoft AC Adapter driver or any other ACPI compliant driver.
4.
On the Device Manager taskbar, click Scan for hardware changes .
Alternately, select Action > Scan for hardware changes .
Windows will scan your computer for hardware that doesn't have drivers installed, and will install the drivers needed to manage your battery's power. The notebook should now indicate that the battery is charging."

One PC Continuesly dropping packets

1. Issue with TCP/IP or network driver error
2. come to Physical Issue problem with cable or switch port.

Diffrence Between Domain Admins and Enterprise Admins

Enterprise admins are designated for the entire forest and domain admins are for specific domain only.

Enterprise Admins are the only group which can perform changes which relate directly to the forest and not an individual domain; there are very few of these tasks. For instance, Forest Prep for R2 or Exchange would need to be done by an Enterprise Admin. Creation of trust relationships between forests. Modifying the values of some object attributes/properties in AD. Creation of Terminal Services Licensing for the whole forest. Destruction of a child Domain or an entire forest. As a rule, if the Change you are planning to make would affect more than an individual domain, you will need Enterprise Admin access - and sometimes you may need Schema Admin access in addition to that.