Answer: VLAN(Virtual local area network)
Explanation: VLAN(Virtual local area network) is the networking device that displays the flexible nature due to the logical connection of one or more LANs. VLAN is used for the purpose of the management, security, scaling etc.
VLAN also has the ability to provide the segmentation in the network by dividing the physical network into segments and making logical network. Router is the source for maintaining the communication in the VLAN.
Thus according to the requirement mentioned in the question ,VLAN is the network device that should be used.
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Answer:
Lossy image formats will remove data during compression as a trade off for lower storage occupation. Lossless data formats will not remove data during compression, resulting in higher quality but also higher storage occupation.
Graphic Artists will almost always use lossless due to it delivering the highest quality image possible.
A virus or malware appearing/pretending to be a legitimate program is called a Trojan.
A book recommended from your professor is a reliable source of information.