# Admission control

> a validation process for connections in communication systems

**Wikidata**: [Q4683813](https://www.wikidata.org/wiki/Q4683813)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Admission_control)  
**Source**: https://4ort.xyz/entity/admission-control

## Summary
Admission control is a validation process used in communication systems to manage and authorize connections. It serves as a critical checkpoint to ensure that connection requests meet specific criteria before being established.

## Key Facts
- **Definition**: A validation process for connections in communication systems.
- **Function**: Verifies and authorizes connection attempts.
- **Context**: Operates within the broader field of computer security and network management.
- **Related Concept**: Acts as a component of computer security policies, which are implementations of computer security models.
- **Also Known As**: The entity has related aliases in other languages, including **Computer security model** (Spanish: *Modelo de seguridad informatica*, Chinese: *计算机安全模型*), though admission control itself is a specific process within this broader class.
- **Identifiers**:
    - **Wikidata ID**: Q5157371 (Note: This ID is associated with the "Computer security model" class in the source text, but the specific entity "Admission control" is the focus).
    - **Google Knowledge Graph ID**: /g/1224mzx8
    - **Microsoft Academic ID**: 2778234956
    - **OmegaWiki Defined Meaning**: 986002
    - **Wikipedia Languages**: Available in Arabic (ar), German (de), English (en), Japanese (ja), and Vietnamese (vi).

## FAQs
### Q: What is the primary purpose of admission control?
A: Its primary purpose is to validate and authorize connections in communication systems, ensuring that only legitimate and policy-compliant requests are established.

### Q: How does admission control relate to computer security models?
A: Admission control is a mechanism that can be enforced through a computer security policy, which itself is an implementation of a computer security model. It is a practical application of broader security frameworks.

### Q: In what systems is admission control typically found?
A: It is found in various communication systems, including computer networks, databases, and other distributed computing environments where managing access and connections is essential.

## Why It Matters
Admission control is a fundamental security and network management function. By validating connections before they are fully established, it prevents unauthorized access, helps manage system resources, and maintains the integrity and performance of communication systems. It is a crucial line of defense in protecting systems from misuse, overload, and malicious attacks, directly contributing to the overall security posture defined by higher-level security models.

## Notable For
- **Preventive Security**: Acts as a proactive measure to block unauthorized connections at the entry point.
- **Resource Management**: Helps prevent system overload by controlling the number and type of active connections.
- **Policy Enforcement**: Directly enforces rules defined in a computer security policy.
- **Broad Applicability**: A concept present across multiple global languages and knowledge bases, including Wikipedia, Wikidata, and OmegaWiki.

## Body
### Definition and Function
**Admission control** is defined as a validation process for connections in communication systems. It is a specific mechanism used to decide whether a new connection or session should be accepted or rejected. This process is essential for maintaining both the security and stability of a system.

### Relationship to Computer Security Models and Policies
Admission control is not an isolated concept but part of a larger security framework. It is related to the broader concept of a **computer security model**.

- **Computer Security Model**: This is a high-level scheme for specifying and enforcing security policies. These models can be based on formal concepts like access rights or distributed computing, or they can be practical implementations without formal theoretical grounding.
- **Computer Security Policy**: This is the practical implementation of a security model. It defines the specific rules, such as who can access what resources.
- **Admission Control's Role**: Admission control is a concrete enforcement mechanism defined within a security policy. It is listed as a key method for preventing unauthorized actions within the "Implementation" section of a computer security model's framework.

For example, a security model might define that only authenticated users can access a network. The security policy would then specify the exact authentication protocols. The admission control process would be the active checkpoint that enforces this policy, validating each connection attempt against the defined rules.

### Other Related Security Concepts
The context provided highlights several other models and concepts that form the ecosystem in which admission control operates:

- **Access Control**: A broader concept that restricts resource access to authorized users. Admission control can be seen as a specific type or phase of access control, focused on the initial connection.
- **Same-origin policy**: A web security mechanism that prevents cross-origin interference, another example of a specific security enforcement rule.
- **FLASK (Flux Advanced Security Kernel)**: An operating system security architecture that provides a framework for implementing security policies, potentially including admission control mechanisms.

### Concrete Examples of Security Models
While admission control is a general process, it operates within systems that may be built upon well-known theoretical models, such as:
- **Bell–LaPadula model**: Focuses on confidentiality, commonly used in government and military systems.
- **Biba model**: Focuses on data integrity by preventing unauthorized modifications.
- **Clark–Wilson model**: Provides a foundation for integrity policies in commercial data processing.
- **Graham-Denning model**: Defines rules for the secure creation and deletion of objects.
- **HRU (Harrison-Ruzzo-Ullman) model**: A general framework for access control.

## References

1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)