Which of the following are network access control mechanisms? Choose all that apply. a. DHCP control b. SNMP traps c. Network traffic analysis d. Switch port security e. Software agents
The correct answer and explanation is:
Correct Answers:
✅ a. DHCP control
✅ d. Switch port security
✅ e. Software agents
Explanation (300 words):
Network Access Control (NAC) is a security solution that enforces policies to regulate which devices are allowed to connect to a network and what they are allowed to do once connected. NAC mechanisms ensure that only authorized and compliant devices gain access, helping to maintain network integrity and protect sensitive information.
Let’s analyze each option:
a. DHCP Control – ✅ Yes
Dynamic Host Configuration Protocol (DHCP) control can be used as a NAC mechanism by preventing unauthorized devices from obtaining IP addresses. For instance, DHCP snooping allows a network to track which devices receive IP addresses and ensure that only trusted devices can get access to the network.
b. SNMP Traps – ❌ No
Simple Network Management Protocol (SNMP) traps are alerts generated by network devices to notify administrators of events like device failures or configuration changes. While useful for monitoring, they do not control or restrict access to the network, so they are not considered NAC mechanisms.
c. Network Traffic Analysis – ❌ No
Network traffic analysis involves monitoring data flows to identify anomalies or security threats. Although it helps in detecting suspicious behavior after access is granted, it doesn’t control or restrict access, so it is not a NAC mechanism.
d. Switch Port Security – ✅ Yes
Switch port security is a common NAC method used to limit the number and type of devices that can connect to a switch port. It can block or shut down ports when unauthorized devices are detected, helping enforce network access control at the hardware level.
e. Software Agents – ✅ Yes
Software agents installed on endpoint devices can enforce security policies and report device posture to a central NAC system. These agents help ensure compliance before granting access, making them a core component of many NAC solutions.
In summary, a, d, and e are effective NAC mechanisms.