Remote access with SSH in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to connect to a Raspberry Pi using SSH.

Raspberry Pi

ssh [1]@192.168.1.10

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

Api

Broot

Cadmin

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'root' or 'admin' as username which are not default for Raspberry Pi.

Omitting the username before the @ symbol.

The default username for Raspberry Pi is pi. So the SSH command should use pi@192.168.1.10 to connect.

2fill in blank

medium

Complete the command to specify a custom SSH port 2222 when connecting.

Raspberry Pi

ssh -p [1] pi@192.168.1.10

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

A22

B80

C443

D2222

Attempts:

3 left

💡 Hint

Common Mistakes

Using the default port 22 instead of the custom port 2222.

Confusing port numbers with common web ports like 80 or 443.

The -p option in SSH specifies the port number. Here, the custom port is 2222.

3fill in blank

hard

Fix the error in the SSH command to copy a file to the Raspberry Pi.

Raspberry Pi

scp myfile.txt [1]192.168.1.10:/home/pi/

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

Api

Bpi@

Cpi:/

D@pi

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the '@' symbol after the username.

Placing '@' in the wrong position.

The correct syntax for SCP requires the username followed by @ before the IP address, like pi@192.168.1.10.

4fill in blank

hard

Fill in the blank to create a dictionary comprehension that maps hostnames to their IPs if the IP starts with '192'.

Raspberry Pi

hosts = {name: ip for name, ip in devices.items() if ip.[1]('192')}

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

Acontains

Bendswith

Cstartswith

Dequals

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'endswith' or 'contains' which do not check the start of the string.

Using 'equals' which requires exact match.

The startswith method checks if the IP string begins with '192'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps usernames to their home directories if the directory path contains '/home'.

Raspberry Pi

user_dirs = { [1] : [2] for [1], [2] in [3].items() if '/home' in [2] }

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

Auser

Bdirectory

Cuser_dir

Dusers

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable names that don't match the loop variable.

Not checking the directory string correctly.

The comprehension iterates over users.items() with user and directory as key and value. The condition checks if '/home' is in the directory path.

Practice

1. What is the main purpose of using SSH with a Raspberry Pi?

easy

A. To securely access and control the Raspberry Pi remotely

B. To install new hardware on the Raspberry Pi

C. To increase the Raspberry Pi's screen brightness

D. To connect a keyboard directly to the Raspberry Pi

Solution

1. Step 1: Understand SSH functionality

   SSH (Secure Shell) is a protocol used to access devices remotely and securely over a network.

2. Step 2: Identify SSH use with Raspberry Pi

   Using SSH with a Raspberry Pi allows you to control it from another computer without needing a monitor or keyboard attached.

3. Final Answer:

   To securely access and control the Raspberry Pi remotely -> Option A

4. Quick Check:

   SSH = Secure remote control [OK]

Hint: SSH is for secure remote control of devices [OK]

Common Mistakes:

• Confusing SSH with hardware installation
• Thinking SSH changes screen settings
• Assuming SSH requires physical keyboard connection

2. Which of the following is the correct syntax to connect to a Raspberry Pi using SSH?

easy

A. connect username@ip_address

B. ssh ip_address@username

C. ssh username@ip_address

D. ssh -connect username ip_address

Solution

1. Step 1: Recall SSH command format

   The standard SSH command to connect is ssh username@ip_address, where username is the Pi's user and ip_address is its network address.

2. Step 2: Check each option

   Only ssh username@ip_address matches the correct syntax exactly. The other options use incorrect commands or order.

3. Final Answer:

   ssh username@ip_address -> Option C

4. Quick Check:

   SSH command = ssh username@ip_address [OK]

Hint: SSH command always uses ssh username@ip_address [OK]

Common Mistakes:

• Swapping username and IP address order
• Using wrong command like 'connect'
• Adding extra flags incorrectly

3. What will happen if you run the command ssh pi@192.168.1.10 on your computer, assuming SSH is enabled on the Raspberry Pi at that IP?

medium

A. The Raspberry Pi will reboot automatically

B. You will connect to the Raspberry Pi's command line remotely

C. You will see the Raspberry Pi's desktop GUI on your computer

D. The command will fail because SSH does not use IP addresses

Solution

1. Step 1: Understand SSH connection effect

   Running ssh pi@192.168.1.10 tries to open a secure shell session to the Raspberry Pi user 'pi' at that IP address.

2. Step 2: Identify expected result

   If SSH is enabled and the IP is correct, you get a command line prompt to control the Pi remotely. It does not reboot or show GUI.

3. Final Answer:

   You will connect to the Raspberry Pi's command line remotely -> Option B

4. Quick Check:

   SSH command opens remote terminal [OK]

Hint: SSH opens remote terminal, not GUI or reboot [OK]

Common Mistakes:

• Expecting graphical desktop via SSH
• Thinking SSH reboots the device
• Believing SSH cannot use IP addresses

4. You try to connect to your Raspberry Pi with ssh pi@192.168.1.10 but get the error: Connection refused. What is the most likely cause?

medium

A. You typed the username incorrectly

B. The Raspberry Pi is out of power

C. The IP address is for a different device

D. SSH is not enabled on the Raspberry Pi

Solution

1. Step 1: Understand 'Connection refused' error

   This error means the Raspberry Pi is reachable but not accepting SSH connections, often because SSH is disabled.

2. Step 2: Evaluate other options

   If the Pi was off, you'd get no response. Wrong username usually prompts for password or denies access, not connection refused. Wrong IP would cause timeout, not refusal.

3. Final Answer:

   SSH is not enabled on the Raspberry Pi -> Option D

4. Quick Check:

   Connection refused = SSH disabled [OK]

Hint: Connection refused means SSH service is off on Pi [OK]

Common Mistakes:

• Assuming power off causes connection refused
• Confusing username errors with connection refusal
• Thinking wrong IP causes refusal instead of timeout

5. You want to securely connect to your Raspberry Pi from outside your home network using SSH. Which step is essential to make this work?

hard

A. Set up port forwarding on your home router to the Pi's IP and port 22

B. Change the Raspberry Pi's username to 'admin'

C. Disable the Raspberry Pi's firewall

D. Connect the Raspberry Pi directly to the internet without a router

Solution

1. Step 1: Understand remote SSH access outside local network

   To access the Pi from outside your home, your router must forward incoming SSH requests (port 22) to the Pi's local IP address.

2. Step 2: Evaluate options for secure remote access

   Changing username or disabling firewall reduces security. Connecting Pi directly to internet is unsafe and usually not possible.

3. Final Answer:

   Set up port forwarding on your home router to the Pi's IP and port 22 -> Option A

4. Quick Check:

   Port forwarding enables external SSH access [OK]

Hint: Port forward router port 22 to Pi for external SSH [OK]

Common Mistakes:

• Thinking username change improves remote access
• Disabling firewall instead of configuring it
• Connecting Pi without router is unsafe and impractical