Wi-Fi standards and security in Intro to Computing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the Wi-Fi standard that operates at 5 GHz frequency.

Intro to Computing

standard = "802.11[1]"  # 5 GHz Wi-Fi standard

Drag options to blanks, or click blank then click option'

Aa

Bb

Cg

Dn

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 802.11b or g which operate at 2.4 GHz.

The 802.11a standard operates at 5 GHz frequency, providing faster speeds but shorter range compared to 2.4 GHz standards.

2fill in blank

medium

Complete the code to select the Wi-Fi security protocol that uses AES encryption.

Intro to Computing

security_protocol = "WPA[1]"  # Uses AES encryption

Drag options to blanks, or click blank then click option'

A3

B1

C2

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing WPA1 which uses weaker encryption.

WPA2 uses AES encryption, which is stronger and more secure than the older TKIP used in WPA1.

3fill in blank

hard

Fix the error in the code to correctly check if a Wi-Fi network uses WPA3 security.

Intro to Computing

if network_security == "WPA[1]":
    print("Network uses the latest security standard.")

Drag options to blanks, or click blank then click option'

A4

B1

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using WPA2 or WPA1 instead of WPA3.

WPA3 is the latest Wi-Fi security standard offering improved protection over WPA2.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps Wi-Fi standards to their maximum speeds (in Mbps) for standards operating at 2.4 GHz.

Intro to Computing

max_speeds = {"802.11" + [1]: [2] for [3] in ["b", "g", "n"]}

Drag options to blanks, or click blank then click option'

A"b"

B54

Cspeed

D600

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect loop variable names or speed values.

This comprehension creates a dictionary with keys like '802.11b' and values as their max speeds. 'b' is concatenated to '802.11', and speeds like 54 Mbps correspond to 802.11g. The variable 'speed' is used as the loop variable.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps Wi-Fi security protocols to their encryption types, filtering only protocols that use AES encryption.

Intro to Computing

aes_protocols = [1]: [2] for [3] in protocols if protocols[[3]] == "AES"}

Drag options to blanks, or click blank then click option'

Aprotocol

Bencryption

Ckey

Dprotocols

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names or mapping keys incorrectly.

The comprehension iterates over keys in 'protocols' dictionary using 'protocol' as loop variable. It maps each 'key' to its 'encryption' value only if the encryption is 'AES'.

Practice

1. Which Wi-Fi standard is known for providing the fastest wireless speeds among the following?

easy

A. Wi-Fi 3 (802.11g)

B. Wi-Fi 4 (802.11n)

C. Wi-Fi 2 (802.11a)

D. Wi-Fi 6 (802.11ax)

Solution

1. Step 1: Understand Wi-Fi standards and speeds

   Wi-Fi standards are named by numbers and letters; higher numbers usually mean faster speeds.

2. Step 2: Compare listed standards

   Wi-Fi 6 (802.11ax) is the newest and fastest standard compared to Wi-Fi 4, 3, and 2.

3. Final Answer:

   Wi-Fi 6 (802.11ax) -> Option D

4. Quick Check:

   Latest Wi-Fi standard = Wi-Fi 6 [OK]

Hint: Latest Wi-Fi number means fastest speed [OK]

Common Mistakes:

• Confusing older standards as faster
• Mixing up Wi-Fi version numbers
• Assuming Wi-Fi 5 is faster than Wi-Fi 6

2. Which of the following is the correct way to specify WPA3 security in a Wi-Fi router settings?

easy

A. WPA3-Personal

B. WPA2-PSK

C. WEP

D. Open Network

Solution

1. Step 1: Identify security types

   WPA3 is the latest Wi-Fi security standard, often called WPA3-Personal for home use.

2. Step 2: Match correct naming

   WPA3-Personal is the correct term; WPA2-PSK is older, WEP is outdated, Open Network means no security.

3. Final Answer:

   WPA3-Personal -> Option A

4. Quick Check:

   Latest Wi-Fi security = WPA3-Personal [OK]

Hint: WPA3-Personal is latest home Wi-Fi security name [OK]

Common Mistakes:

• Choosing WEP which is insecure
• Confusing WPA2 with WPA3
• Selecting Open Network which has no password

3. Consider this scenario: A Wi-Fi router supports 802.11ac standard and uses WPA2 security. Which of the following is true about this setup?

medium

A. It supports moderate speeds and uses outdated security.

B. It supports fast speeds but uses a secure, widely accepted security.

C. It provides the fastest Wi-Fi speeds and the strongest security.

D. It supports slow speeds and no security.

Solution

1. Step 1: Analyze Wi-Fi standard 802.11ac

   802.11ac (Wi-Fi 5) supports fast speeds but is not the latest standard.

2. Step 2: Analyze WPA2 security

   WPA2 is still widely used and considered secure, though WPA3 is newer.

3. Final Answer:

   It supports fast speeds but uses a secure, widely accepted security. -> Option B

4. Quick Check:

   802.11ac + WPA2 = fast + secure [OK]

Hint: 802.11ac = fast Wi-Fi; WPA2 = secure but not newest [OK]

Common Mistakes:

• Assuming WPA2 is outdated and insecure
• Thinking 802.11ac is the latest Wi-Fi
• Confusing speed with security level

4. A user sets their Wi-Fi router to use WEP security but notices frequent unauthorized access. What is the main problem and how to fix it?

medium

A. Wi-Fi standard is slow; upgrade to 802.11ax.

B. WEP is strong; change the Wi-Fi password frequently.

C. WEP is outdated and weak; switch to WPA3 security.

D. Router hardware is faulty; replace the router.

Solution

1. Step 1: Identify WEP security issues

   WEP is an old security type that is easily cracked by attackers.

2. Step 2: Recommend a secure alternative

   Switching to WPA3 provides stronger protection against unauthorized access.

3. Final Answer:

   WEP is outdated and weak; switch to WPA3 security. -> Option C

4. Quick Check:

   WEP weak = unauthorized access; use WPA3 [OK]

Hint: WEP is weak; always use WPA3 or WPA2 [OK]

Common Mistakes:

• Thinking changing password fixes WEP weakness
• Blaming hardware instead of security type
• Confusing Wi-Fi speed with security

5. You want to set up a Wi-Fi network in a large office with many devices. Which combination of Wi-Fi standard and security is best to ensure fast speeds and strong protection?

hard

A. Wi-Fi 6 (802.11ax) with WPA3-Enterprise

B. Wi-Fi 4 (802.11n) with WPA2-Personal

C. Wi-Fi 5 (802.11ac) with WEP

D. Wi-Fi 3 (802.11g) with Open Network

Solution

1. Step 1: Consider Wi-Fi standards for large office

   Wi-Fi 6 (802.11ax) supports many devices with fast speeds and better efficiency.

2. Step 2: Choose security for enterprise environment

   WPA3-Enterprise offers strong security suitable for business networks.

3. Final Answer:

   Wi-Fi 6 (802.11ax) with WPA3-Enterprise -> Option A

4. Quick Check:

   Best speed + security for office = Wi-Fi 6 + WPA3-Enterprise [OK]

Hint: Office Wi-Fi needs Wi-Fi 6 + WPA3-Enterprise [OK]

Common Mistakes:

• Choosing outdated Wi-Fi standards
• Using weak security like WEP or open networks
• Ignoring enterprise security needs