200-301 Question 254
Select 3An administrator is tasked with configuring a new VLAN for voice traffic on a network. The requirements include enabling Quality of Service (QoS) to prioritize voice traffic, applying security settings to restrict unauthorized access, and ensuring advanced settings like DHCP snooping are enabled to prevent rogue DHCP servers. Which steps should the administrator take to meet these requirements?
- A
Enable QoS and configure the appropriate trust boundary for voice traffic.
- B
Configure access control lists (ACLs) to restrict unauthorized devices from accessing the VLAN.
- C
Enable DHCP snooping on the VLAN to filter rogue DHCP servers.
- D
Disable QoS to prevent unnecessary overhead on the switch.
- E
Assign a low priority to voice traffic in the QoS profile to ensure fairness with other traffic types.
Show answer and explanation
Correct answers: A, B, C
Explanation
To meet the requirements of the scenario, the administrator must enable QoS to prioritize voice traffic, apply security measures such as ACLs to restrict unauthorized access, and enable advanced settings like DHCP snooping to protect against rogue DHCP servers. Disabling QoS or assigning low priority to voice traffic would undermine the ability to meet the requirements, as voice traffic is sensitive to delays and packet loss.
- A. Correct.
Enabling QoS and setting the trust boundary ensures that voice traffic is prioritized properly and marked at the source, which is essential for handling real-time traffic like VoIP.
- B. Correct.
Configuring ACLs helps restrict unauthorized devices from connecting to the VLAN, enhancing security.
- C. Correct.
Enabling DHCP snooping ensures that only authorized DHCP servers can provide IP addresses, preventing rogue DHCP attacks.
- D. Incorrect.
Disabling QoS would go against the requirement to prioritize voice traffic and would result in poor voice quality during network congestion.
- E. Incorrect.
Assigning a low priority to voice traffic would conflict with the goal of prioritizing voice traffic, which requires higher priority for smooth communication.