NSG rules (inbound, outbound) in Azure - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an NSG in Azure?

An NSG (Network Security Group) is like a security guard for your cloud network. It controls which traffic can come in (inbound) and go out (outbound) of your virtual machines or subnets.

beginner

What does an inbound NSG rule do?

An inbound NSG rule controls the traffic coming into your resource. It decides if incoming data is allowed or blocked based on rules like IP address, port, and protocol.

beginner

What does an outbound NSG rule do?

An outbound NSG rule controls the traffic leaving your resource. It decides if outgoing data is allowed or blocked based on rules like destination IP, port, and protocol.

intermediate

What are the key parts of an NSG rule?

Each NSG rule has: a priority number (which rule runs first), direction (inbound or outbound), source and destination (IP or subnet), protocol (TCP, UDP, or Any), port range, and action (allow or deny).

intermediate

Why is rule priority important in NSG?

Rule priority decides which rule applies first. Lower numbers have higher priority. If a higher priority rule allows or denies traffic, later rules are ignored for that traffic.

What does an inbound NSG rule control?

A Traffic inside a virtual machine

B Traffic leaving a resource

C Traffic between two Azure regions

D Traffic coming into a resource

Inbound NSG rules control incoming traffic to your resource.

Which part of an NSG rule decides the order of evaluation?

A Source IP

B Priority number

C Protocol type

D Port range

Priority number determines which rule is checked first.

What action can an NSG rule take on traffic?

A Allow or Deny

B Encrypt or Decrypt

C Route or Block

D Log or Ignore

NSG rules either allow or deny traffic based on conditions.

Which protocol can you specify in an NSG rule?

A HTTP only

B FTP only

C TCP, UDP, or Any

D SMTP only

NSG rules support TCP, UDP, or Any protocol.

If two NSG rules conflict, which one applies?

A The one with lower priority number

B The one created last

C The one with higher priority number

D Both apply equally

The rule with the lower priority number (higher priority) applies first.

Explain how inbound and outbound NSG rules work together to protect an Azure resource.

Think of inbound as the front door and outbound as the back door security.

Describe the key components you need to set when creating an NSG rule.

Imagine setting rules for who can enter or leave your house and how.