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DNS Overview
Содержание
- 1. DNS Overview
- 2. What is DNS?Distributed Directory ServiceMaps names to
- 3. Domain Name Server/SystemComes from your service provider
- 4. DNS gives us the name of a
- 5. February 2003slideset 1 -Purpose of naming (review)Addresses
- 6. IP addresses can be Dynamic or StaticStatic
- 7. 192.168.1.1NetworkHost Name
- 8. IPV4 vs IPV6IPV4 now running out of
- 9. Слайд 9
- 10. Слайд 10
- 11. IPV6 opens up the number of addresses IPv6 uses
- 12. Слайд 12
- 13. http://whatismyipaddress.com/http://www.whatismyip.com/You can check your IP on the LAN Type CMDThen – ipconfig
- 14. PingFind if a website is “up”Find a websites IP address
- 15. Subnet MaskA subnet mask allows IP networks
- 16. Default GatewayIn computer networking, a gateway is
- 17. Questions ?????Give two reasons why a company
- 18. Скачать презентанцию
What is DNS?Distributed Directory ServiceMaps names to values – resource recordsMajor backbone of the internetMakes networks human friendly
Слайды и текст этой презентации
Слайд 3Domain Name Server/System
Comes from your service provider amongst other places
The
DNS translate the domain name to an IP address
An IP
address in the IPV4 standard has four numbers separated by three decimals, as in: 70.74.251.42
Слайд 4DNS gives us the name of a website
At the start
of the internet you needed to type the IP address
Instead
of remembering this number, DNS provides a name: Google.com (for example)one of Googles many IP addresses is
http://74.125.224.72/
Слайд 5February 2003
slideset 1 -
Purpose of naming (review)
Addresses are used to
locate objects
Names are easier to remember than numbers
You would like
to get to the address or other objects using a nameDNS provides a mapping from names to resources of several types
IP address can be changed but Domain name can remain the same
Слайд 6IP addresses can be Dynamic or Static
Static IP addressing is
for one customer on one IP address and Dynamic IP
addressing assigns a different IP address each time the ISP customer logs on to their computer, but this is dependent upon the Internet Service Provider (ISP) because some ISP's only change the IP address as they deem it necessary
Слайд 8IPV4 vs IPV6
IPV4 now running out of IP addresses –
limited
Uses 32 bits
different IP Addresses that can exist. However, due
to the allocation of IP ranges to different organisations and tasks, the number is lower.
Слайд 11IPV6 opens up the number of addresses
IPv6 uses 128 bits for
each address, meaning we have theoretically
addresses available.
Слайд 13http://whatismyipaddress.com/
http://www.whatismyip.com/
You can check your IP on the LAN
Type CMD
Then
– ipconfig
Слайд 15Subnet Mask
A subnet mask allows IP networks to be subdivided
for security and performance purposes A subnet mask allows you to
identify which part of an IP address is reserved for the network, and which part is available for host use
Слайд 16Default Gateway
In computer networking, a gateway is a node (a
router) on a TCP/IP network that serves as an access
point to another network
Слайд 17Questions ?????
Give two reasons why a company might want to
use a domain name instead of an IP Address for
their website?Describe what a Domain Name Server does
List the three parts that make up a domain name:
