Which technology prevents client devices from arbitrarily connecting to the network without state remediation?
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A. B. C. D.B.
The correct answer is B. 802.1x.
802.1x is a security protocol that provides port-based network access control. It prevents unauthorized access to the network by requiring authentication before granting access.
When a client device attempts to connect to a network, it must first authenticate itself to an authentication server, typically through a RADIUS server. The server then checks the credentials and determines whether to grant access to the network.
If the client device does not pass authentication, it is not granted access to the network. This prevents unauthorized devices from arbitrarily connecting to the network without state remediation.
802.1x is commonly used in wireless networks but can also be used in wired networks. It is an important security feature for any network that needs to control access to sensitive information or resources.
The other answer choices are incorrect:
A. 802.11n is a wireless networking standard that provides higher speeds and better range than previous standards. It does not provide network access control.
C. MAC Authentication Bypass (MAB) is a feature that allows devices to connect to a network using only their MAC addresses, without requiring username and password authentication. While this can be useful for some scenarios, it does not provide the level of security provided by 802.1x.
D. IP Source Guard is a feature that helps prevent IP address spoofing by blocking traffic from IP addresses that are not in the DHCP snooping binding database or static IP source configuration. While this is an important security feature, it does not prevent arbitrary client devices from connecting to the network.