Question 284 - N10-008 discussion

VoIP phone is a device that uses voice over IP (VoIP) technology to transmit and receive voicecalls over a network. A VoIP phone typically has a built-in switch that allows a computer to beconnected to the same network port as the phone, sharing the same physical link andbandwidth.A VLAN tag is a piece of information that is added to the header of a network frame to indicatewhich virtual LAN (VLAN) it belongs to. A VLAN is a logical grouping of network devices thatshare the same broadcast domain, regardless of their physical location or connection. VLANscan 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 tothe VoIP phone, because the phone and the computer may belong to different VLANs. Forexample, the phone may belong to a voice VLAN that is dedicated for VoIP traffic, while thecomputer may belong to a data VLAN that is used for general network access. Without a VLANtag, the switch that connects to the VoIP phone would not be able to distinguish between theframes from the phone and the frames from the computer, and would not be able to forwardthem to the correct destination VLAN.Therefore, option D is the most likely answer, as the VLAN tags need to be configured correctlyto provide network connectivity to the computer. The switch port that connects to the VoIPphone needs to be configured as a trunk port, which can carry multiple VLANs, and the VoIPphone needs to be configured to add the appropriate VLAN tag to the frames from thecomputer.Option A is not a likely answer, as the port duplex settings determine the mode of datatransmission 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 duplexsettings 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 combinesmultiple physical ports into a single logical port, increasing the bandwidth and redundancy ofthe link. The port aggregation does not affect the VLAN tags or the network connectivity to thecomputer.Option C is also not a likely answer, as the ARP settings are related to the address resolutionprotocol (ARP), which is a protocol that maps a network layer address, such as an IP address, toa data link layer address, such as a MAC address. The ARP settings do not affect the VLAN tagsor the network connectivity to the computer.Option E is also not a likely answer, as the MDIX settings are related to the medium dependentinterface crossover (MDIX), which is a feature that allows a switch to automatically detect thetype of cable that is connected to a port, and adjust the pinout accordingly. The MDIX settingsdo not affect the VLAN tags or the network connectivity to the computer.CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Architecture, Section 3.1:Network Topologies and Technologies, Page 1361Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 3.1: Network Topologiesand Technologies, Page 232What is a VoIP Phone? | Definition and Examples3What is a VLAN Tag? | Definition and Examples4How to Configure VLANs on a VoIP Phone - Cisco5