How Network Access Controls Work
Network access control is the process of restricting the access to network resources by devices that are used by the end user. Network access controls implement a defined security policy for access which is supported by a network access server that performs the authentication and authorization. The server also restricts the data that each user can access, as well as the activities that can be performed by the end user once they gain access to the network.
How Network Access Controls Work
There are several different types of network access controls that perform different functions according to the needs of the organization and the level of security that is required for performing daily functions.
- Agent-Based Network Access Control: An agent-based network access control operates through the endpoint device (user's device) which provides a higher level of security and ensures that the end-user is complying with security policies. The unit continually operates in the background of the device to monitor security compliance and then sends periodic updates to the policy server.
- Agentless Network Access Control: An agentless network access control does not require any added installations. Instead this type of network access control assesses compliancy on both endpoints before the user is allowed to access the network. The problem with this type of network access control is that authorization is provided through the assessment of network traffic. This makes the application easier to exploit to gain unauthorized access to the network system.
- Hardware-Based Network Access Control: A hardware-based network access control works through an appliance that is installed on the network and functions in conjunction with the network traffic. This type of network access control requires changes in the infrastructure and operational practices to allow for defined access by the end user. Because implementation requires significant server configuration changes, the chances of failure are greater than other network access control systems.
- Dynamic Network Access Control: Dynamic network access control is the easiest form of deployment for controlling access by end users. This is because the system does not require any software or hardware appliance installation or changes in the network configuration. Instead a dynamic network access control works on specific computers that are connected to a local area network and are considered to be trusted systems. When an unauthorized user attempts to access the network, the trusted systems will restrict access and then communicate the action to the main policy server.
The type of network access control you choose for your organization depends upon your network configuration and set up. Before choosing an option that suits your organization, it is necessary to evaluate the network configuration and the different reasons for defining access by the end users.
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