802.1Q tagging, also known as VLAN tagging, is used to identify VLANs on a trunk link between switches.
This allows the switches to transfer data for multiple VLANs (or networks) over a single physical connection.
This method ensures that traffic from different VLANs is properly separated and managed across the network.References:CompTIA Network+ study materials.

Increasing the MTU (Maximum Transmission Unit) size allows larger frames to be transmitted, reducing overhead and improving throughput - especially for large file transfers like backups.
A . QoS prioritizes traffic but doesn't reduce backup times directly.
B . SDN is a network management model, not a parameter change.
D . VXLAN encapsulates VLANs, not relevant to backup speeds.
E . TTL is for packet lifetime, not throughput.
Reference:
Domain: Network Infrastructure - MTU, jumbo frames, performance tuning.

802.1x is a network access control protocol that provides an authentication mechanism to devices trying to connect to a LAN or WLAN. This ensures that only authorized devices can access the network, making it ideal for mitigating the risk of unknown devices connecting to the network, especially in accessible areas.
* 802.1x Authentication: Requires devices to authenticate using credentials (e.g., username and password, certificates) before gaining network access.
* Access Control: Prevents unauthorized devices from connecting to the network, enhancing security in public or semi-public areas.
* Implementation: Typically used in conjunction with a RADIUS server to manage authentication requests.
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Covers 802.1x and its role in network security.
* Cisco Networking Academy: Provides training on implementing 802.1x for secure network access control.
* Network+ Certification All-in-One Exam Guide: Explains the benefits and configuration of 802.1x authentication in securing network access.

Reference: CompTIA Network+ Certification Exam Objectives - Wireless Networks section.

Elasticity is the ability of a system (often in cloud environments) to automatically scale resources up or down in real time based on demand.
* A. Scalability means the ability to grow over time but not necessarily dynamically.
* B. SaaS is a service model, not a resource-allocation concept.
* C. Hybrid cloud is a deployment model, not a performance behavior.
References (CompTIA Network+ N10-009):
* Domain: Networking Concepts - Cloud computing, elasticity vs. scalability.