The best answer is SNMP (Simple Network Management Protocol). SNMP enables monitoring of network devices (routers, switches, firewalls, servers) and provides performance data such as CPU usage, bandwidth utilization, and interface status. In this scenario, if SNMP monitoring had been in place, administrators would have received alerts that the router was overutilized before customers noticed outages.
A . Packet capture (e.g., Wireshark) is useful for deep troubleshooting but is reactive, not proactive, and not scalable for continuous monitoring.
C . Syslog collects log messages but generally does not provide proactive resource utilization metrics. It is complementary but not the best fit for this problem.
D . SIEM aggregates logs and security events for analysis, but the primary requirement here is performance and availability monitoring.
By implementing SNMP monitoring (and potentially integrating it with a network monitoring tool such as Nagios, PRTG, or SolarWinds), the organization can track utilization trends, set thresholds, and automatically generate alerts, thereby preventing downtime from going unnoticed.

When the command switchport voice vlan 69 is used, it tags the voice traffic with VLAN 69, while the workstation traffic continues untagged on the access VLAN, which is typically considered thedata VLAN. This configuration enables both voice and data traffic over the same port while keeping them in separate VLANs for QoS and traffic management.
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An evil twin attack is when an attacker sets up a rogue access point (AP) with the same SSID as a legitimate one to trick users into connecting. Once users connect, attackers often present fake login pages or capture unencrypted session data to steal login credentials.
A . DNS poisoning manipulates DNS resolution but is not inherent to evil twin.
C . ARP spoofing is a Layer 2 attack involving MAC/IP mapping manipulation.
D . Denial of service can be a side effect but is not the primary objective of evil twin attacks.
The main purpose of an evil twin is credential theft, enabling further unauthorized access to networks or systems.