How can a network administrator restrict access to unauthorized devices?

How can a network administrator restrict access to unauthorized devices?

• A. By using static IP addressing only
• B. By implementing port security and MAC address filtering on switches
• C. By setting up a VPN connection
• D. By increasing the network's bandwidth

Answer: (B)

Implementing port security and MAC address filtering on switches is an effective method for a network administrator to restrict access to unauthorized devices. Port security operates on a switch port level, allowing the administrator to configure the maximum number of MAC addresses that can be learned on each port. When the limit is reached or an unauthorized device attempts to connect, the switch can take predefined actions such as dropping packets from that port, disabling the port, or sending an alert. This prevents unwanted devices from gaining access to the network by limiting connections to predefined, authorized MAC addresses. MAC address filtering enhances this security by allowing only specific MAC addresses to communicate through the switch. This way, if a device attempts to connect to the network and its MAC address is not on the allowed list, it can be automatically blocked from accessing the network. The other choices do not provide direct methods to restrict access to unauthorized devices. Static IP addressing does not prevent unauthorized devices from connecting, as they can still be assigned an IP address even if it is not within the authorized block. Setting up a VPN connection secures data transmission over the internet but does not directly manage device access on a local network. Increasing network bandwidth might improve overall performance but would not influence device access control. Thus, the most appropriate

Implementing port security and MAC address filtering on switches is an effective method for a network administrator to restrict access to unauthorized devices.

Port security operates on a switch port level, allowing the administrator to configure the maximum number of MAC addresses that can be learned on each port. When the limit is reached or an unauthorized device attempts to connect, the switch can take predefined actions such as dropping packets from that port, disabling the port, or sending an alert. This prevents unwanted devices from gaining access to the network by limiting connections to predefined, authorized MAC addresses.

MAC address filtering enhances this security by allowing only specific MAC addresses to communicate through the switch. This way, if a device attempts to connect to the network and its MAC address is not on the allowed list, it can be automatically blocked from accessing the network.

The other choices do not provide direct methods to restrict access to unauthorized devices. Static IP addressing does not prevent unauthorized devices from connecting, as they can still be assigned an IP address even if it is not within the authorized block. Setting up a VPN connection secures data transmission over the internet but does not directly manage device access on a local network. Increasing network bandwidth might improve overall performance but would not influence device access control. Thus, the most appropriate