Protected mode in Redis - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the purpose of Redis protected mode?

Redis protected mode is enabled by default. What is its main purpose?

A To limit the number of client connections to Redis

B To encrypt all data stored in Redis automatically

C To prevent Redis from accepting connections from external IP addresses by default

D To automatically backup Redis data every hour

💡 Hint

Think about security when Redis is started without a password and accessible from outside.

Protected mode prevents Redis from accepting connections from external IPs unless explicitly configured, protecting it from unauthorized access.

❓ query_result

intermediate

What happens when you try to connect remotely to Redis in protected mode without authentication?

Assuming Redis is running with protected mode enabled and no password set, what will be the result of a remote connection attempt?

A Connection succeeds and allows all commands

B Connection succeeds but only read commands are allowed

C Connection is accepted but immediately disconnected

D Connection is refused with an error message about protected mode

💡 Hint

Protected mode blocks unauthorized remote connections.

Redis rejects remote connections without authentication in protected mode, showing an error about protected mode.

📝 Syntax

advanced

Which configuration disables Redis protected mode correctly?

You want to disable Redis protected mode by editing redis.conf. Which line is correct?

A protected-mode no

B protected_mode off

C disable-protected-mode yes

D protectedmode false

💡 Hint

Check the exact spelling and syntax of the configuration directive.

The correct directive is 'protected-mode' followed by 'no' to disable it.

❓ optimization

advanced

How to safely allow remote connections while keeping Redis secure?

You want to allow remote clients to connect to Redis but keep it secure. Which approach is best?

A Disable protected mode and rely on firewall only

B Disable protected mode and set a strong password with 'requirepass' directive

C Keep protected mode enabled and connect remotely without authentication

D Disable protected mode and open Redis port to the internet without password

💡 Hint

Think about authentication and network access controls.

Disabling protected mode requires setting a password to prevent unauthorized access. Firewall alone is not enough.

🔧 Debug

expert

Why does Redis refuse remote connections despite disabling protected mode?

You disabled protected mode in redis.conf but remote clients still cannot connect. What could be the cause?

A Redis is bound only to localhost (127.0.0.1) in the 'bind' configuration

B Redis requires a password but none was set

C Redis server is not running

D Protected mode is still enabled by default

💡 Hint

Check the network interface Redis listens on.

If Redis is bound only to localhost, remote connections cannot reach it even if protected mode is off.