wide area networks

Question 1

gateways

Answer 1

device that connects dissimilar network segments
protocol converter

router can act as gateway for TCP/IP network by sending+receiving data on internet
router can see MAC + IP addresses of data but cannot repackage packets for a diff protocol

Question 2

WAN

Answer 2

wide area network
not confined to one area
owned by multiple organisations
eg internet

Question 3

satellite radio waves

Answer 3

satellite communications- voice + video calls, internet, TV,radio channels
span long distances , operate under circumstances other communications cant
in geostationary orbit
available globally
very reliable
expensive to set up and has high data costs
provides weather info
more secure-used by military
helpful during times of disaster-rarely fails
allows for high amounts of data transmitted

Question 4

parts of communication satellite

Answer 4

transponder
antenna
communication payload
switching systems
command
control system

Question 5

microwave

Answer 5

link-communications system that uses a beam of radio waves in microwave frequency range to transmit video/audio/data between 2 locations

Question 6

cellular phone network

Answer 6

many signal areas “cells” which overlap and create coverage for a larger area- user can move across cells w/o losing connections
mobile phone tower/base station in each cell- sends + receives mobile transmissions

Question 7

cellular technologies + evolution

Answer 7

3G
improved data transfer - supported large data formats -allowed for video calls
LTE- long term evolution 3.5G , slightly faster ,hybrid of 3G
4G- even faster speeds (up to 2gbps), allowed for mobile hotspots and viewing digital media on mobile phones
5G- up to 100x faster than 4G, low latency

Question 8

fibre internet

Answer 8

uses fibre optic cables to transmit data
“superfast broadband” - travels of speed of light
not affected by distance from exchange
can handle higher volumes of traffic w/o speed affected

Question 9

adsl

Answer 9

asymmetric digital subscriber line
telephone lines transmit data along copper cables from nearest telephone exchange
further from exchange-slower speeds
more internet traffic-slower download speeds

Question 10

internet speed

Answer 10

rate at which info travels from web to your device (Mbps)

Question 11

SMTP

Answer 11

simple mail transfer protocol
used when email delivered
outgoing emails

Question 12

POP3

Answer 12

Post office protocol
allows download of email from email server and then deletes from server
uses port 110

Question 13

IMAP

Answer 13

Internet message access protocol
client can download email (similar to pop3 but has more features)
keeps email on email server-useful if want to access
requires greater disk space and more CPU resources
uses port 143

Question 14

email protcols

Answer 14

smtp
pop3
imap

Question 15

http

Answer 15

hyper text transfer protocol
standard protocol for transferring web pages+ content across internet

Question 16

https

Answer 16

hypertext transfer protocol over secure socket layer
secure version of https
used on web pages that ask for private info
uses secure socket layer (SSL) - certification issued by Certificate of Authority

Question 17

web protocols

Answer 17

http
https

Question 18

FTP

Answer 18

file transfer protocol
used to transfer files across the internet (from 1 computer to specific location on another computer)

Question 19

webDAV

Answer 19

web based distributed authoring + versioning
extension of http protocol
used for communication between client browsers and web servers
open standard- implemented on UNIX and Windows servers
users can collaboratively edit + manage files on remote servers