CREST Practitioner Security Analyst (CPSA) Practice

What is the function of Port 1 in TCP networking?

1. Remote Job Entry

2. TCP Port Service Multiplexer

3. Echo Test

4. File Transfer Protocol

The correct answer is: TCP Port Service Multiplexer

The function of Port 1 in TCP networking is designated for the TCP Port Service Multiplexer. This port is primarily a service that allows multiple service requests to be handled simultaneously while directing the incoming service requests to the appropriate services. It serves as a listening port that can route incoming connections to other services without creating a distinct listening port for each service. This function plays a crucial role in maintaining efficient network communications, as it allows for the consolidation of multiple service protocols under a single port. By utilizing Port 1, systems can manage multiple concurrent connections effectively, which is vital for environments where numerous applications or services operate simultaneously and require access to network resources. Understanding the specific purpose of Port 1 aids in grasping how TCP/IP networking efficiently manages various services through multiplexing, facilitating better resource management and reducing the number of open ports required on a server, boosting security and performance.