Computer Networking
Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?

xDSL
IPSec
Cable
HDLC
VPN

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Computer Networking
You connect a host to a switch port, but the new host cannot log into the server that is plugged into the same switch. What could the problem be?

The VTP configuration on the switch is not updated for the new host.
The switch port the host is connected to is not configured to the correct VLAN membership.
The router is not configured for the new host.
The host has an invalid MAC address.

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