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WorksheetsCrash Course Computer Science #29 - The Internet
Total questions: 18
Worksheet time: 15mins
Computers using the (a) first connect to their (b) before connecting to (c) before ultimately connecting to (d) like for cities.
You can see how data travels by reviewing the route data in your computer's __ program.
routepath
traceroute
dataroute
reviewroute
Data travels the internet in
packets
switches
codes
addresses
Internet packets have to conform to a standard called
IP
OP
AP
EP
IP is a little too simple, so more advanced protocols were developed that sit on top of IP. One of the simplest and most common is
User Datagram Protocol
User Database Program
United Data Program
Userbase Datagram Program
Inside the UDP header is useful, extra information like
port number
post number
path number
portal number
(a) gets the packet to the right (b) , but (c) gets the packet to the right (d) .
What is the CHECKSUM in the example?
(a)
What happens if the checksum is incorrect?
the program will seek a new, revised copy
the program will fix the data by recalculating the sum
the program will discard the packet
the program with return the packet to the original sender
When it's really important for a packet to get to its destination in whole, ____ protocol is used.
transmission control
transfer confirmation
total control
telecomm communication
TCP has extra features like
sequential numbers on packets
an acknowledgement that packets are received
the ability to correct checksum data
prior "shipping" across internet servers
TCP can handle
out-of-order packet delivery
dropped packets
congestion by throttling transmission rates
secure, encrypted files
Why would you use UDP over TCP?
for faster data transfer
to avoid lag
to improve security
to ensure data is received
A "phone book" for the internet that matches web address with IP addresses is the
domain number system
domain name system
database of name and servers
destination name system
How many domain names are registered?
100 million
200 million
300 million
400 million
Match the following
top level domain
.com, .org, .gov
second level domain
google.com, dftba.com
sub-domain
drive.google.com, images.google.com
Match the following
physical layer
Electrical signals or radio waves
data link layer
addresses, collision detection
network layer
switching and routing
transport layer
protocols like UDP and TCP
session layer
open connections and pass info
OSI has 2 more layers we haven't covered:
presentation layer
application layer
communication layer
abstract layer
