The network security and performance are the major factors to be considered for end user at usage level in a hybrid communication network. In terms of security and performance of network are studied in many cases but it requires being explored more based on the size of the network and the end user handling at lower layer of OSI model. There are voluminous steps taken to consider the issues such as Layer - 2 Exploitation, the inability of a device to perform the required services at time due to redundant switch loops. This study evaluates the security issues and the performance issues together with the trial of VLAN (Virtual LAN) security perspective and STP (Spanning Tree Protocol) loop free performance aspect. The real time devices such as router, switches are used to carry out experiment and the network behavior observed using wireshark. The different CLI outputs generated are evaluated the security and performance issues coherently using show commands. This project experiments security and performance issues together with help of VLAN and STP and suggests the best practice of VLAN and STP in typical hybrid network environment.