(Advanced Research Projects Agency net)
NFSNET (National Fond for Science net)
NFSNET
Backboon - INTERNETInternet is a global net.
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LESSON 5
Содержание
- 1. LESSON 5
- 2. Point 1. The internet structureThe main stages
- 3. Point 1. The internet structureStructure:Internet consists of
- 4. Point 1. The internet structureEvery host or
- 5. Point 2. The main principles of networkNo
- 6. Point 2. The main principles of networkIP-addressingEvery
- 7. Point 2. The main principles of networkDynamic
- 8. Point 2. The main principles of networkDomain
- 9. Point 2. The main principles of networkDNS
- 10. Скачать презентанцию
Point 1. The internet structureThe main stages of Internet development:ARPANET (Advanced Research Projects Agency net)NFSNET (National Fond for Science net)NFSNET Backboon - INTERNETInternet is a global net.
Слайды и текст этой презентации
Слайд 2Point 1. The internet structure
The main stages of Internet development:
ARPANET
(Advanced Research Projects Agency net)
Backboon - INTERNETInternet is a global net.
Слайд 3Point 1. The internet structure
Structure:
Internet consists of local nets.
There are
3 categories of computers:
Hosts (nodes) handle the client access.
Servers provide
information.Clients use information.
Слайд 4Point 1. The internet structure
Every host or host group of
Internet is served by some organization (provider).
Servers
WEB (World Wide Web)-
for work with WWWMail – for receiving and transmitting the mail
FTP (file transfer protocol) – for file storage which are used for client download
NNTP (network news transfer protocol) – for teleconferencing- and news service
DNS (domain name system) – for converting the letter (domain) addresses into IP-addresses
Слайд 5Point 2. The main principles of network
No rules and limits
to presentation of information
Information interchange between all the computers
No limits
to computer type and OSNo hierarchy between PC connected to the Internet
Слайд 6Point 2. The main principles of network
IP-addressing
Every computer connected has
its IP-address.
IP-address is a group of numbers (dotted decimal or
octat). A dotted decimal is 1 byte of 32-bits address and cannot be more then 255.The 32-bits address has 2 parts: net number and host number.
Слайд 7Point 2. The main principles of network
Dynamic address is an
IP-address given automatic and used during limited time period.
For example,
108.25.17.100
Слайд 8Point 2. The main principles of network
Domain addressing
Domain address (URL
– uniform resource locater) is a symbol (letter) group of
domains with points.There is a hierarchy. The 1.st level domain is the last one. It is an organization type or country. The 2.nd level domain is often an organization activity character. The 3.d level domain is a computer name (gov, mil, edu, com, org, net)
Слайд 9Point 2. The main principles of network
DNS is a method
of address hierarchy construction in the net and a mechanism
of getting an IP-address.IP-address ↔ DNS ↔ URL
85.156.231.62 http://www.vedu.ru
