Saturday, February 28, 2009

Online Tricky Staff

Double Click To Enlarge The Photo
Online Tricky Staff - Easy to do and Fun to do.

Fool your friends or buddies.

What it is ?

This is a trick to map the IP addresses to the wrong host names.

For example, you want to surf yahoo and you type www.yahoo.com

but the page appears to be www.hi5.com or something else, like the picture above.

How to do ?

Just go to this following directory:

1)C:\WINDOWS\system32\drivers\etc

Or you can just use "Search" from "Start Menu".

2)Open the "Hosts" file with "Notepad"

3)Then open "Common Prompt" with "Win + R"

and type "cmd". Or Go to

"Start Menu - Programs - Accessories - Common Prompt"

4)And type "ping yahoo.com" and it will provided you an IP address of "Yahoo"

5)Wrote that IP in the hosts file and by spacing two or more type

any host name ... eg.google.com and save that file.

68.180.206.184 google.com


After all these steps, just go to open Internet Explorer and type "www.yahoo.com".

You will find out the different or what kind of trick that you are learning exactly.

If you like it and you found interesting, comment will be appreciated. Thz :)

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Sunday, February 22, 2009

Reasons Of Outsourcing Or Outsourcing Factors

Outsourcing is subcontracting a process, such as product design or manufacturing, to a third-party company. The decision to outsource is often made in the interest of lowering firm or making better use of time and energy costs, redirecting or conserving energy directed at the competencies of a particular business, or to make more efficient use of land, labor, capital, (information) technology and resources.


Reasons Of Outsourcing

  • Legacy systems and sometimes the staff that manages them can be replaced with something newer and better.
  • An outside contractor handles personnel-related issues such as training, hiring and firing, and compensation. This may resolve problems with turnover, pay scales, job classifications, affirmative action, unions, and other personnel problems that management wants to avoid.
  • The costs of the service are fixed and readily calculated
  • Temporary work overloads becomes vendor's responsibility
  • The company's resources can be allocated to the principal line of business
  • The company may lack in-house skills or need to free up in house staff for other duties
  • Higher service quality and cost savings are expected.


Other factors to consider in outsourcing agreement
  • Software licenses may need to be transferred to the outsourcing vendor so that it can be authorized to act on your behalf. You may still be responsible for licensing, maintenance, and upgrade costs.
  • Unless the contract provides specifically for disaster recovery, you may need to retain responsibility for managing the risks and planning for recovery actions.
  • If the outsourcing vendor replaces your existing systems, you may have the responsibility of removing the old equipment and disposing of it.

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Saturday, February 21, 2009

IPV4 Vs IPV6 And The Differences ...

Difference Between IPv4 and IPv6
IPv4
  1. Source and destination addresses are 32 bits (4 bytes) in length.
  2. IPSec support is optional.
  3. IPv4 header does not identify packet flow for QoS handling by routers.
  4. Both routers and the sending host fragment packets.
  5. Header includes a checksum.
  6. Header includes options.
  7. Address Resolution Protocol (ARP) uses broadcast ARP Request frames to resolve an IP address to a link-layer address.
  8. Internet Group Management Protocol (IGMP) manages membership in local subnet groups.
  9. ICMP Router Discovery is used to determine the IPv4 address of the best default gateway, and it is optional.
  10. Broadcast addresses are used to send traffic to all nodes on a subnet.
  11. Must be configured either manually or through DHCP.
  12. Uses host address (A) resource records in Domain Name System (DNS) to map host names to IPv4 addresses.
  13. Uses pointer (PTR) resource records in the IN-ADDR.ARPA DNS domain to map IPv4 addresses to host names.
  14. Must support a 576-byte packet size (possibly fragmented).

IPv6

  1. Source and destination addresses are 128 bits (16 bytes) in length.
  2. IPSec support is required.
  3. IPv6 header contains Flow Label field, which identifies packet flow for QoS handling by router.
  4. Only the sending host fragments packets; routers do not.
  5. Header does not include a checksum.
  6. All optional data is moved to IPv6 extension headers.
  7. Multicast Neighbor Solicitation messages resolve IP addresses to link-layer addresses.
  8. Multicast Listener Discovery (MLD) messages manage membership in local subnet groups.
  9. ICMPv6 Router Solicitation and Router Advertisement messages are used to determine the IP address of the best default gateway, and they are required.
  10. IPv6 uses a link-local scope all-nodes multicast address.
  11. Does not require manual configuration or DHCP.
  12. Uses host address (AAAA) resource records in DNS to map host names to IPv6 addresses.
  13. Uses pointer (PTR) resource records in the IP6.ARPA DNS domain to map IPv6 addresses to host names.
  14. Must support a 1280-byte packet size (without fragmentation).

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Digital Vs Analog ( Advantages & Disadvantages )

Definition of Digital
A method of storing, processing and transmitting information through the use of distinct electronic or optical pulses that represent the binary digits 0 and 1.


Advantages of Digital -
  • Less expensive
  • More reliable
  • Easy to manipulate
  • Flexible
  • Compatibility with other digital systems
  • Only digitised information can be transported through a noisy channel without degradation
  • Integrated networks

Disadvantages of Digital -

  • Sampling Error
  • Digital communications require greater bandwidth than analogue to transmit the same information.
  • The detection of digital signals requires the communications system to be synchronised, whereas generally speaking this is not the case with analogue systems.

Definition of Analogue
Analogue is a transmission standard that uses electrical impulses to emulate the audio waveform of sound. When you use a phone, the variations in your voice are transformed by a microphone into similar variations in an electrical signal and carried down the line to the exchange.

Advantages of Analogue -

  • Uses less bandwidth
  • More accurate

Disadvantages of Analogue -

  • The effects of random noise can make signal loss and distortion impossible to recover

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