User-Introduced Network Component Analysis

A network technician receives a call from a user who is experiencing network connectivity issues.

The network technician questions the user and learns the user brought in a personal wired router to use multiple computers and connect to the network.

Which of the following has the user MOST likely introduced to the network?

A.

Rogue DHCP server

B.

Evil twin

C.

VLAN mismatch

D.

Honeypot.

A.

The user has introduced a personal wired router to the network. This device is not managed or authorized by the network administrator, which means that it can introduce multiple issues to the network. The most likely issue introduced by the personal wired router is a rogue DHCP server.

DHCP (Dynamic Host Configuration Protocol) is a network protocol that allows devices to obtain IP addresses and other network configuration information automatically. When a new device is connected to the network, it sends a broadcast message requesting an IP address. A DHCP server responds to this message by offering an IP address and other network configuration information.

If a rogue DHCP server is introduced to the network, it can interfere with the normal DHCP process and cause connectivity issues. For example, the rogue DHCP server may offer incorrect IP addresses or other incorrect network configuration information, which can cause devices to be unable to connect to the network or experience other connectivity issues.

An Evil twin is a type of wireless attack in which an attacker creates a fake wireless network that looks like a legitimate one. VLAN mismatch is a configuration issue that occurs when devices are assigned to the wrong VLANs. A honeypot is a security mechanism used to detect and deflect attacks. None of these options is a likely result of introducing a personal wired router to the network.

Therefore, option A (rogue DHCP server) is the most likely issue introduced to the network by the user bringing in a personal wired router.