Internet and Security Flashcards
what are IP addresses?
each computer on the internet has a globally unique IP address, like a “phone number”
true or false?
the internet uses IP addresses only
true
How do you keep track of millions of IP addresses of all the computers connected to the internet?
we use hostnames and a BIG internet “phonebook” (DNS)
what is the Domain Name System? (DNS)
our internet phonebook, translating hostnames to IP addresses
what are top level domains?
zones that the internet phonebook divides the internet into
How do you guarantee every domain name is unique?
First, every TLD is unique. Then, every sub-domain must be unique
how are TLD’s or Domain’s maintained?
by an authority
What is TCP/IP and how does it send/receive messages?
transmission control protocol/internet protocol
- The internet is based on it, a set of rules on how computers communicate with each other
- based on the idea of “postcards” (known as packets)
why do we need IP addresses?
the internet uses IP Addresses only, so you need the IP address of another computer in order to communicate with it
what do hostnames require?
a hostname on the internet must belong to some domain, which is under a TLD
- ex: The “cs.uvic.ca” is a hostname for the CS Department under the “uvic.ca” domain
what are two types of computers on the internet
- client: it uses some services
- server: it provides some services
skype uses..
cd uses..
8-bit
16-bit
what are most computers? (90%)
clients
what are examples of services a server may provide?
“www” “email” “chat” “stream videos”
what is a port number?
used to identify each service (much like a telephone extension)
