6.1. Unit Overview

This unit focuses on Computing Systems and Networks, one of the big ideas in computer science. The App Inventor lesson in this unit shows how to use the Internet in apps, including the ability to send text messages over wifi. The CS Principles lessons focus on the Internet, how it works, how it enables innovation and collaboration, and security concerns for using it. In this unit, you will complete a series of activities using network administration software tools such as Ping and traceroute as well as a Domain Name System (DNS) simulator app to explore how we communicate on the Internet with IP Addresses.

Technical Terms

Below is a table of all of the technical terms that you'll learn in this unit. You will find a vocabulary section similar to this at the end of each lesson. Hover over the terms to review the definitions. You'll be able to practice your knowledge of the vocabulary with a quizlet at the end of the unit.
abstraction layer
asymmetric cipher
bandwidth
biometrics
brute force attack
certificate authority
cipher
ciphertext
client
computer bug
computing system
cryptography
debugging
decryption
Diffie-Hellman
digital certificate
digital divide
DNS
domain name
encryption
encryption algorithm
encryption key
ethernet
fault-tolerant
firewalls
frequency analysis
function
host
HTML
HTTP
HTTPS
Internet Service Provider
intractable
IP address
IPv4
IPv6
key exchange problem
keylogger
LAN
latency
local variables
malware
malware scanning software
modem
multi-factor authentication (MFA)
network
one time pad
packet
packet sniffer
packet switching
phishing
ping
plaintext
polyalphabetic substitution
protocol
public key cryptography
ransomware
rogue access point
router
routing
rsa
run-time error
scalability
semantic error
server
SMTP/POP
ssl
strong password
substitution cipher
symmetric cipher
symmetric encryption
syntax error
traceroute
transposition cipher
Trojan horse
trust model
URI
virus
WAN
wifi
World Wide Web
worm

6.1.1. Self-Check

Q-1: Identify 1-2 vocabulary terms from the table above that you know and define them in your own words. If you don’t know any of these words yet, that’s ok! Instead, write 1-2 sentences on how you plan to practice learning the vocabulary for this unit.

Q-2: Identify 1-2 vocabulary terms from the table above that you have heard before but don’t know the definition for.

Q-3: Identify 1-2 vocabulary terms from the table above that you don’t know but want to learn in this unit.

6.1.2. Reflection: For Your Portfolio

Answer the following portfolio reflection questions as directed by your instructor. Questions are also available in this Google Doc - you will be prompted to make your own editable copy.