Tech Knowledge Center: October 2013

Wednesday, October 16, 2013

Some Important Portals & their Founders

1. Google— Larry Page & Sergey Brin
2. Facebook— Mark Zuckerberg
3. Yahoo— David Filo & Jerry Yang
4. Twitter— Jack Dorsey & Dick Costolo
5. Internet— Tim Berners Lee
6. Linkdin— Reid Hoffman, Allen Blue& Koonstantin Guericke
7. Email— Shiva Ayyadurai
8. Gtalk— Richard Wah kan
9. Whats up— Laurel Kirtz
10. Hotmail— Sabeer Bhatia
11. Orkut— Buyukkokten
12. Wikipedia— Jimmy Wales
13. You tube— Steve Chen, Chad Hurley & JawedKarim
14. Rediffmail— Ajit Balakrishnan
15. Nimbuzz— Martin Smink & Evert Jaap Lugt
16. Myspace— Chris Dewolfe & Tom Anderson
17. Ibibo— Ashish Kashyap
18. OLX— Alec Oxenford & Fabrice Grinda
19. Skype— Niklas Zennstrom,Janus Friis & Reid Hoffman
20. Opera— Jon Stephenson von Tetzchner & Geir lvarsoy
21. Mozilla Firefox— Dave Hyatt & Blake Ross
22. Blogger— Evan Willams

A complete tutorial about IP Address

Let us begin with IP Addresses.

What is an IP Address?
► An Internet Protocol address is a numerical label assigned to each device (e.g., computer, mobile phone)
that is connected to a computer network that uses the Internet Protocol for communication.
► An IP address is used for two purposes:
1) To identify whether the interface is host or network.
2) To determine the location of the device.
► IP Versions: IPv4 and IPv6.
Although IPv4 is the earlier version, it is the most commonly used version.
► IPv4 is a 32-bit decimal number while IPv6 is 128-bit number.
► IPv4 is normally written as fournumbers between 1 and 255, each separated from the other by a decimal point.
This standard is called as DOTTED-DECIMAL NOTATION.
► Ex: 115.241.40.93
► There are countless IP addresses in today's world!
-------------------------------------------------------------------------
What is the purpose of IP Address Classes?
Each IP Address Class provides the following information:
► Class A: First 8 bits → NETWORK ID & remaining 24 bits → HOST ID
► Class B: First 16 bits → NETWORK ID & remaining 16 bits → HOST ID
► Class C: First 24 bits → NETWORK ID & remaining 8 bits → HOST ID
► Class D: It represents a 32-bit multicast group ID.
► Class E: It is currently not being used. (NO need)
► For example, Let us consider the IP Address 203.43.21.12
We know that it belongs to Class C.Therefore, the NETWORK ID is 203.43.21 and the HOST ID is 12.

Subscribe to: Posts (Atom)