CREST Practitioner Security Analyst (CPSA) Practice

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Master the CREST Practitioner Security Analyst Exam. Prepare with quizzes and comprehensive study guides that include tips and explanations. Excel in your certification journey!

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Which of the following protocols is used for VLAN Trunking?

STP
CDP
DTP
VLAN

The correct answer is: DTP

The protocol used for VLAN trunking is Dynamic Trunking Protocol (DTP). DTP is a Cisco proprietary protocol that helps to negotiate and manage trunk links between switches. It is responsible for dynamically enabling trunk links and allowing switches to automatically configure the link type, ensuring that multiple VLANs can travel over a single physical link. This is particularly useful in networks where VLANs are extensively used, allowing management of VLAN information and traffic efficiently. In contrast, the other options play different roles in a network. Spanning Tree Protocol (STP) is primarily used for preventing loops in Ethernet networks. Cisco Discovery Protocol (CDP) is used for discovering information about directly connected Cisco devices, while "VLAN" refers to Virtual Local Area Networks in general rather than a specific protocol. Therefore, DTP is the correct choice as it directly relates to VLAN trunking capabilities.