NACL vs Security Groups: What Are the Differences?
Updated on Jun 13, 2023 | 8 min read | 5.9k views
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Updated on Jun 13, 2023 | 8 min read | 5.9k views
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Security groups and Network Access Control List (NACL) are two major components of an organisation’s network security. These security parameters are kind of similar and act as virtual firewalls protecting the network. The most significant similarity is that both NACL and Security Groups use inbound and outbound rules to control the traffic to and from the resources within a VPC (Virtual Private Cloud).
However, both technologies have some distinctions. Read on to learn more about NACL vs Security Group and the subtle differences that set the two apart. To enhance your knowledge in network security, register for the Master of Science in Computer Science from LJMU.
Network security in cloud computing refers to the various technologies, processes, controls and policies used to protect data and enhance data security. Its sole focus is to protect cloud networks from unauthorised access, misuse, modification or data exposure. It helps maintain confidentiality, integrity and availability of data.
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Amazon Web Services (AWS) is an online platform that provides easy and cost-effective cloud computing solutions. It offers many advantages and accessible services such as data storage, first content delivery, computing power, etc. It helps companies scale heights and grow their operations to meet market demands.
Network Access Control Lists is a firewall to your network that protects your system and is an operational layer of security that protects the VPC for controlling traffic within the network. NACL provides an additional layer of security to Amazon Web Services.
It secures the VPC that can be imagined as containers for storing subnets. Hence, it helps to manage and control traffic efficiently and provides data storage security.
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Organisations can improve network security, reduce risks, and ensure that only authorised users can access the network by implementing access control. The following are some advantages of NACL over Security Groups:
Understanding the pros and cons of each technology helps make the ultimate choice in the Network ACL vs Security Group debate. The disadvantages of NACL over Security Groups are enumerated as follows:
To understand the concept of AWS NACL vs Security Group, it is crucial to understand how each works. Network ACLs work according to the following rules:
Security Groups control the incoming and outgoing traffic to Amazon Web Services, acting as a virtual firewall that helps control the traffic flow. The various internal and external rules control the flow. The concept of Security Groups is a milestone in understanding the difference between NACL and Security Groups.
When a Security Group is created, it is assigned to a particular VPC. Each group is given a name and description to find them easily whenever required.
The role of Security Groups in protecting a network and their various advantages are stated below:
Although Security Groups have proven helpful in many ways, they are not devoid of drawbacks. The disadvantages of Security Groups over network ACL are enumerated as follows:
A Security Group is installed to control the traffic allowed to leave or reach the associated resources. For instance, it controls all the inbound and outbound traffic when connected to an EC2 machine. There is a difference between NACL and Security Groups and how they work.
However, Security Groups can be associated only with the particular resources in a VPC for which it has been created. When VPC is created, it comes with a Security Group by default. Following this, particular Security Groups can be created for each VPC.
The availability zone of a VPC is installed with a public subnet for web servers and a private subnet for database servers. Load balancers are equipped with separate Security Groups that help to allow HTTP and HTTPS traffic within the network.
The difference between Security Group and NACL is broadly classified as follows:
NACL | Security Groups |
Network ACLs operate in subnet levels | Security groups function at an instance level |
It supports both ‘allow’ and ‘deny’ rules. | It only supports ‘allow’ rules. |
It should explicitly allow the return traffic and is, therefore, stateless. | It is stateful because of the creation of inbound and outbound rules. |
NACL supports the blocking of specific IP addresses if found suspicious | It cannot block specific IP addresses |
The rules are processed as per number order while alloying the traffic | The rules are entirely processed before deciding to allow the traffic. |
It automatically applies all instances with subnets without the interference of the user | It applies when a user specifies a Security Group when launching an instance and associates it with the Security Group. |
Network ACL vs Security Group is a vast concept. Learn more about these concepts by enrolling in the Executive PG Programme in Full Stack Development from IIITB.
NACL is widely used in organisations today, as discussed below:
The everyday use cases of Security Groups are enumerated as follows:
When it comes to Network ACLs, the rules are applied to their priority, where the priority of each rule is demonstrated with a particular number. However, when Security Groups are concerned, all the rules are applied to an instance. There is no point in choosing any rule to apply to an instance. This implies that each rule is assessed according to its priority.
Thus, in the race of NACL vs Security Group, NACL takes the upper hand in some cases, whereas Security Groups are applicable in others. It entirely depends upon the need, functionality, and type of the network.
Some of the best practices with Network ACLs and Security Groups are:
NACL and Security Groups are vital for protecting and working with networks. Companies today employ professionals with a deep understanding of NACL and Security Groups and the necessary knowledge to work with these technologies.
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