module 7 Flashcards
internet history
started in 1969 as arpanet
evolved into NSFNET in 1987
internet backbone
foundation network linked with fiber optic cables that support high bandwidth
Network access points (NAP)
determine how traffic is routed over the internet
hypermedia
documents that include embedded references
hypertext
embedded references in the hypermedia
domain name system (DNS)
translates language based names to IP addresses
uniform resource locators (URL)
used to identify webpage
DSL methods for connecting to a network
symmetric DSL
asymmetric DSL
very high speed DSL
symmetric DSL
has the same data transmission rate for the upstream and downstream
up to 1.5Mbps in both directions
asymmetric DSL (ADSL)
lower transmission rate upstream than downstream
upstream: 3.5 Mbps
downstream: 34 Mbps
very high DSL (VDSL)
rate downstream and upstream up to 100 Mbps over short distances
three tools to navigate across the internet
navigational
search engines
directories
navigational tools
provide menu options that users are familiar with
search engines
crawl the web using spiders
index data provided by the spiders
use the index it created to provde results based on the search terms
directories
organize info into cateogies
automated and human powered directory