VLAN hopping allows an attacker to send traffic into another VLAN without authorization, often by impersonating a switch and negotiating a trunk link. This lets the attacker traverse into normally inaccessible VLANs.
A). MAC flooding disrupts switch operations but does not cross VLANs.
B). DNS poisoning corrupts name resolution.
D). ARP spoofing reroutes local traffic but doesn't grant VLAN traversal.
References (CompTIA Network+ N10-009):
Domain: Network Security - VLAN attacks, unauthorized lateral movement.

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.
References (CompTIA Network+ N10-009):
Domain: Network Infrastructure - MTU, jumbo frames, performance tuning.

When multiple redundant links exist between switches, Spanning Tree Protocol (STP) is required to prevent switching loops. STP blocks redundant paths but can allow aggregation if configured with protocols like LACP.
B . SVIs provide Layer 3 interfaces, not loop prevention.
C . Native VLAN defines the untagged VLAN but does not manage loops.
D . FHRP (VRRP, HSRP, GLBP) provides gateway redundancy, not switch uplink management.
Reference (CompTIA Network+ N10-009):

An evil twin is a rogue Wi-Fi access point that mimics a legitimate network. Attackers use it to intercept and manipulate traffic, making it an on-path (formerly MITM) attack opportunity.
Breakdown of Options:
A . Phishing - Tries to steal credentials through fake emails/websites but does not intercept network traffic.
B . Dumpster diving - Involves physical security breaches, not network interception.
C . Evil twin - ✅ Correct answer. A rogue Wi-Fi AP impersonates a real network, allowing traffic interception.
D . Tailgating - Involves physical access security, not network interception.
Reference:
CompTIA Network+ (N10-009) Official Study Guide - Domain 3.3: Explain common network security threats.