Service and port management in Cybersecurity - Mini Project: Build & Apply

Service and Port Management Basics

📖 Scenario: You are a network administrator managing a small office network. You need to keep track of which services run on which ports to ensure security and proper access.

🎯 Goal: Build a simple list of common services with their port numbers, then filter to find services running on ports below 1024, which are considered well-known ports.

📋 What You'll Learn

Create a dictionary called services with these exact entries: 'HTTP': 80, 'HTTPS': 443, 'FTP': 21, 'SSH': 22, 'SMTP': 25

Create a variable called well_known_port_limit and set it to 1024

Create a new dictionary called well_known_services that includes only the services from services running on ports less than well_known_port_limit

Add a final line that creates a list called service_names containing only the names of the services in well_known_services

💡 Why This Matters

🌍 Real World

Network administrators often need to know which services run on which ports to configure firewalls and monitor network traffic.

💼 Career

Understanding service and port management is essential for cybersecurity roles, network engineering, and system administration.

1

Create the services dictionary

Create a dictionary called services with these exact entries: 'HTTP': 80, 'HTTPS': 443, 'FTP': 21, 'SSH': 22, 'SMTP': 25

Cybersecurity

# Create the services dictionary with the given entries
# Your code here

Need a hint?

Use curly braces {} to create a dictionary with service names as keys and port numbers as values.

2

Set the well-known port limit

Create a variable called well_known_port_limit and set it to 1024

Cybersecurity

services = {'HTTP': 80, 'HTTPS': 443, 'FTP': 21, 'SSH': 22, 'SMTP': 25}
# Create the well_known_port_limit variable and set it to 1024
# Your code here

Need a hint?

Just assign the number 1024 to the variable well_known_port_limit.

3

Filter well-known services

Create a new dictionary called well_known_services that includes only the services from services running on ports less than well_known_port_limit

Cybersecurity

services = {'HTTP': 80, 'HTTPS': 443, 'FTP': 21, 'SSH': 22, 'SMTP': 25}
well_known_port_limit = 1024
# Create well_known_services dictionary filtering ports below well_known_port_limit
# Your code here

Need a hint?

Use dictionary comprehension to select services with ports less than well_known_port_limit.

4

List the names of well-known services

Add a final line that creates a list called service_names containing only the names of the services in well_known_services

Cybersecurity

services = {'HTTP': 80, 'HTTPS': 443, 'FTP': 21, 'SSH': 22, 'SMTP': 25}
well_known_port_limit = 1024
well_known_services = {service: port for service, port in services.items() if port < well_known_port_limit}
# Create a list of service names from well_known_services
# Your code here

Need a hint?

Use the keys() method on the dictionary and convert it to a list.