HTML and The Internet Flashcards
1
Q
IP
A
- each device has unique IP address
- IPv4, IP address represented as 4 “8 bit” integer in range 0,255
2
Q
Static IP
A
IP reserved for a given device
3
Q
Dynamic IP
A
IP allocated to device when it connects to the internet
4
Q
Local IP
A
addressable only on a private network
- local IPS can often still access open internet through proxy servers or gateways, gateways have connection to the global internet
5
Q
External IP
A
directly addressable from anywhere on the internet
6
Q
Hostnames
A
- Hierarchical to domain name
- Top Level Domain (TLD) e.g. .au
- hostnames resole to IP address via Domain Name System (DNS) using “name servers”
7
Q
2 hostnames, same IP address
A
2 servers on same computer
8
Q
1 hostname, multiple IP address
A
big servers like youtube
9
Q
Structure of Internet
A
- devices address each other by iP but communicate via Internet routers
- communication from client to server
10
Q
Applications and ports
A
- multiple apps run over IP networks e.g. email, messenger
- machines communicate with other machines over the internet via collection of numbered ports, differentiated by application
e. g. 25 = outgoing mail, 110 = incoming mail - to identify which application wants which port
11
Q
URL
A
- uniform resource locators
- internet resources addressed with URLs
scheme: //hostname:port/path - scheme = protocol for accessing file
- hostname = device the file lives on
- port = access port (optional)
- path = where file lives on device
12
Q
HTML
A
- Hypertext markup language
- primary language used to markup web documents
- elements = tag,s entities
- tags may optionally contain attributes
13
Q
Line breaks
A
<br></br>
14
Q
Horizontal breaks
A
<hr></hr>
15
Q
hyperlinks
A
<a></a><a></a>
