03 - IT Networks

Question 1

computer network & their components (5)

Answer 1

2+ connected computers

major components:
– Client and server computers
– Network interfaces (NICs)
– Connection medium
– Network operating system (NOS)
– Hubs, switches, routers

Question 2

internet & its types of connections (5)

Answer 2

internet service providers (ISPs) provide connections

connections:

• dial-up
• digital subscriber line (DSL)
• cable internet
• fiber optics (optic cables)
• satellite

Question 3

domain name system (DNS)

Answer 3

converts IP addresses to domain names

hierarchical structure -> works backwards

“*.pt” = portuguese top-level domain
- Owner: DNS.PT

• “*.ulisboa.pt”
– Owner: Universidade de Lisboa

• “*.iseg.ulisboa.pt”
– Owner: ISEG

Question 4

future of the internet

Answer 4

currently = IPv4
- 2 ^32 possible addresses

IN THE FUTURE:

IPv6
- 2 ^128 addresses

Internet2
- Advanced networking consortium (b/w universities, businesses, government agencies, other institutions)

Question 5

VPN

Answer 5

virtual private network

• secure + encypted + private
• tunneling (PPTP)

Question 6

web hypertext

Answer 6

HTML = hypertext markeup language

HTTP = hypertext transfer protocol

URL = uniform resource locator

Question 7

types of searches on the web (5)

Answer 7

search engines
mobile search
semantic search
social search 
visual search (tagging, pinterest)

Question 8

cloud computing

Answer 8

Web-based processing, whereby shared resources, software, and information are provided to computers and other devices

Question 9

cloud service pyramid model

Answer 9

• SaaS = end users (eg. gmail, google docs…)
• PaaS = developers (eg. force.com, microsoft azure…)
• IaaS = infrastructure & network architects (eg. rackspace, AWS…)