* A VoIP phone is a device that uses voice over IP (VoIP) technology to transmit and receive voice calls over a network. A VoIP phone typically has a built-in switch that allows a computer to be connected to the same network port as the phone, sharing the same physical link and bandwidth.
* A VLAN tag is a piece of information that is added to the header of a network frame to indicate which virtual LAN (VLAN) it belongs to. A VLAN is a logical grouping of network devices that share the same broadcast domain, regardless of their physical location or connection. VLANs can help to isolate traffic, improve security, and reduce congestion on a network.
* A VLAN tag is required to provide network connectivity to the computer that is connected to the VoIP phone, because the phone and the computer may belong to different VLANs. For example, the phone may belong to a voice VLAN that is dedicated for VoIP traffic, while the computer may belong to a data VLAN that is used for general network access. Without a VLAN tag, the switch that connects to the VoIP phone would not be able to distinguish between the frames from the phone and the frames from the computer, and would not be able to forward them to the correct destination VLAN.
* Therefore, option D is the most likely answer, as the VLAN tags need to be configured correctly to provide network connectivity to the computer. The switch port that connects to the VoIP phone needs to be configured as a trunk port, which can carry multiple VLANs, and the VoIP phone needs to be configured to add the appropriate VLAN tag to the frames from the computer.
* Option A is not a likely answer, as the port duplex settings determine the mode of data transmission
* between the switch and the VoIP phone. The port duplex settings can be either half-duplex, which means that data can be transmitted in one direction at a time, or full-duplex, which means that data can be transmitted in both directions simultaneously. The port duplex settings do not affect the VLAN tags or the network connectivity to the computer.
* Option B is also not a likely answer, as the port aggregation is a technique that combines multiple physical ports into a single logical port, increasing the bandwidth and redundancy of the link. The port aggregation does not affect the VLAN tags or the network connectivity to the computer.
* Option C is also not a likely answer, as the ARP settings are related to the address resolution protocol (ARP), which is a protocol that maps a network layer address, such as an IP address, to a data link layer address, such as a MAC address. The ARP settings do not affect the VLAN tags or the network connectivity to the computer.
* Option E is also not a likely answer, as the MDIX settings are related to the medium dependent interface crossover (MDIX), which is a feature that allows a switch to automatically detect the type of cable that is connected to a port, and adjust the pinout accordingly. The MDIX settings do not affect the VLAN tags or the network connectivity to the computer.
References:
* CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Architecture, Section 3.1: Network Topologies and Technologies, Page 1361
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 3.1: Network Topologies and Technologies, Page 232
* What is a VoIP Phone? | Definition and Examples3
* What is a VLAN Tag? | Definition and Examples4
* How to Configure VLANs on a VoIP Phone - Cisco5