Firewalls and network protection in Intro to Computing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a firewall rule that blocks incoming traffic on port 80.

Intro to Computing

firewall_rule = {"action": "block", "port": [1], "direction": "inbound"}

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

A22

B443

C80

D25

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing port 22 blocks SSH instead of web traffic.

Choosing port 443 blocks secure web traffic, not HTTP.

The firewall rule blocks incoming traffic on port 80, which is commonly used for HTTP web traffic.

2fill in blank

medium

Complete the code to allow only outbound traffic from the local network.

Intro to Computing

firewall_rule = {"action": "allow", "direction": [1], "source": "192.168.1.0/24"}

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

Aoutbound

Binbound

Cboth

Dlocal

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing inbound allows incoming traffic, not outbound.

Choosing both allows all traffic, not just outbound.

The rule allows outbound traffic only, meaning data leaving the local network is permitted.

3fill in blank

hard

Fix the error in the firewall rule that should block all traffic except from IP 10.0.0.5.

Intro to Computing

firewall_rule = {"action": "block", "source": "[1]", "direction": "inbound"}

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

Alocalhost

B10.0.0.5

C255.255.255.255

D0.0.0.0/0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 10.0.0.5 as source blocks only that IP, not all others.

Using localhost blocks only local machine traffic.

Using "0.0.0.0/0" blocks all IP addresses. To allow only 10.0.0.5, this rule blocks everything else by default.

4fill in blank

hard

Fill both blanks to create a firewall rule that allows inbound HTTPS traffic only from a specific IP.

Intro to Computing

firewall_rule = {"action": "[1]", "port": [2], "source": "203.0.113.10", "direction": "inbound"}

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

Aallow

Bblock

C443

D80

Attempts:

3 left

💡 Hint

Common Mistakes

Using block action prevents the traffic instead of allowing it.

Using port 80 allows HTTP, not HTTPS.

The rule allows inbound traffic on port 443 (HTTPS) from IP 203.0.113.10 only.

5fill in blank

hard

Fill all three blanks to define a firewall rule that allows outbound SMTP traffic to a trusted mail server.

Intro to Computing

firewall_rule = {"action": "[1]", "port": [2], "destination": "[3]", "direction": "outbound"}

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

Aallow

B25

Cmail.trustedserver.com

Dblock

Attempts:

3 left

💡 Hint

Common Mistakes

Using block action prevents traffic to the trusted server.

Using wrong port allows other traffic.

Using wrong destination allows SMTP to untrusted servers.

The rule allows outbound traffic on port 25 (SMTP) to the trusted mail server mail.trustedserver.com.