Port and bind address in Redis - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Redis default port and bind address

What is the default port Redis listens on, and what is the default bind address if none is specified?

A Port 8080 and bind address ::1

B Port 3306 and bind address 0.0.0.0

C Port 5432 and bind address 192.168.1.1

D Port 6379 and bind address 127.0.0.1

💡 Hint

Redis uses a common port number for its service and by default listens only on localhost.

Redis by default listens on port 6379 and binds to the loopback address 127.0.0.1, meaning it only accepts connections from the local machine.

❓ query_result

intermediate

Result of Redis bind configuration

Given the Redis configuration line bind 0.0.0.0, what is the effect on Redis server accessibility?

A Redis accepts connections from any IP address

B Redis only accepts connections from localhost

C Redis refuses all connections

D Redis accepts connections only from 127.0.0.1 and ::1

💡 Hint

0.0.0.0 means all IPv4 addresses.

Binding to 0.0.0.0 means Redis listens on all network interfaces, allowing connections from any IP address.

📝 Syntax

advanced

Identify the correct Redis configuration to listen on port 6380 and bind only to localhost

Which configuration snippet correctly sets Redis to listen on port 6380 and bind only to localhost?

A

port 6380
bind 127.0.0.1

B

bind 0.0.0.0
port 6380

C

port 6379
bind 127.0.0.1

D

port 6380
bind ::1

💡 Hint

Check both port number and bind address carefully.

Option A correctly sets the port to 6380 and binds to localhost (127.0.0.1). Other options either have wrong port or bind address.

❓ optimization

advanced

Optimizing Redis bind settings for security and accessibility

You want Redis to be accessible only from two specific IP addresses: 192.168.1.10 and 10.0.0.5. Which bind configuration is correct?

A bind 127.0.0.1

B bind 0.0.0.0

C bind 192.168.1.10 10.0.0.5

D bind 192.168.1.10

💡 Hint

Redis supports multiple IP addresses in bind directive separated by spaces.

Option C binds Redis to only the two specified IP addresses, restricting access to those machines. Other options are either too open or too restrictive.

🔧 Debug

expert

Debugging Redis bind and port configuration error

After changing Redis config to port 70000 and bind 256.256.256.256, Redis fails to start. What is the cause?

A Port number 70000 is valid but IP address 256.256.256.256 is invalid

B Port number 70000 is invalid and IP address 256.256.256.256 is invalid

C Port number 70000 is invalid but IP address 256.256.256.256 is valid

D Both port and IP address are valid but Redis needs restart

💡 Hint

Check valid ranges for port numbers and IP addresses.

Port numbers must be between 0 and 65535. IP addresses must have each octet between 0 and 255. Both values are invalid here causing Redis startup failure.