What is Information Technology?
"Information technology (IT) is the use of any computers, storage, networking and other physical devices, infrastructure and processes to create, process, store, secure and exchange all forms of electronic data." (cited from http://searchdatacenter.techtarget.com/definition/IT). In a nutshell, IT encompasses the devices that transmit electronic data from a source to a destination computing device (hardware), as well as the physical medium (cabling) used to receive, then transmit that valuable data.
What problem does "trunking" provide a solution for?
In theory, and by default, data traffic that originates from ONLY one VLAN can traverse the link between 2 switches. Herein lies a problem in that if a switch has multiple VLANs configured, only traffic from the default VLAN 1 will reach its intended destination switch. This defeats the purpose of creating a VLAN for multiple departments i.e. HR, R&D, Marketing, etc., "Trunking," however, solves this problem by allowing traffic from multiple VLANs (Virtual Local Area Networks) to traverse the physical link between a common source and destination switch.
Why is my certification exam timed?
There are several reasons why your certification exam is timed. One reason in particular is that the Exam Vendor desires to not only measure one's understanding of the certification subject matter, but one's ability to competently and efficiently respond to an IT crisis in a very timely manner. This is so important because for some major companies, revenue losses average hundreds, and even thousands of dollars per hour of network downtime. The Exam Vendor seeks to certify those candidates who not only understand how their technologies work, but those who can efficiently implement and troubleshoot in the event of an emergency.