CompTIA Network+ · Domain 2 · 20% of the examNetwork Implementation

Answer: B. The OSPF route, because it is the longest prefix match

Routers pick the most specific match first, and /24 is longer than /16, so the OSPF route wins. Administrative distance only decides between routes to the exact same prefix, so the static route's lower AD doesn't matter here.

Answer: D. The EIGRP route, because its administrative distance (90) is lower than OSPF's (110)

When two protocols offer the same prefix, the router trusts the one with the lower administrative distance: internal EIGRP is 90 and OSPF is 110. Metrics from different protocols are calculated differently and can't be compared with each other.

Answer: C. BGP

BGP is the exterior gateway protocol used to exchange routes between autonomous systems, and it offers path attributes for controlling inbound and outbound paths. OSPF is an interior gateway protocol meant for routing inside one organization.

Answer: A. It places the frame in the native VLAN configured for that trunk

802.1Q sends native VLAN traffic untagged, so any untagged frame received on a trunk is assigned to the native VLAN. The switch doesn't drop it, which is why the native VLAN must match on both ends of the trunk.

Answer: A. As an access port in data VLAN 10 with voice VLAN 50

A voice VLAN lets the phone tag its own traffic with VLAN 50 while the PC's untagged traffic stays in access VLAN 10. A full trunk to a desk would expose every VLAN to that jack, and with native VLAN 50 the PC's untagged traffic would land in the voice VLAN.

Answer: D. A first hop redundancy protocol with 10.20.0.1 as the shared virtual IP

An FHRP such as VRRP or HSRP lets two routers share a virtual IP (and virtual MAC), and the standby router takes over that address if the active one fails. Giving both routers 10.20.0.1 directly would create a duplicate IP conflict, and most hosts don't fail over automatically between gateways listed in DHCP.

Answer: B. Bundle the two links into a link aggregation group using LACP

Link aggregation combines the physical links into one logical interface, so spanning tree sees a single link and doesn't block it, while traffic is spread across both members. Disabling spanning tree would leave the redundant links forming a loop and risk a broadcast storm.

Answer: C. 1, 6, 11

2.4 GHz channels are only 5 MHz apart but each is about 20-22 MHz wide, so in North America only 1, 6 and 11 don't overlap. Plans such as 3, 7, 11 look evenly spaced but still overlap because the channels are only four apart.

Answer: D. WPA3-Enterprise using 802.1X

Enterprise mode uses 802.1X so each user authenticates individually against RADIUS, and disabling one account removes only that user's access. WPA3-Personal is far stronger than older PSK, but everyone still shares one passphrase, so you can't revoke a single user.

Answer: A. Directional antennas on both buildings, aimed at each other

Directional antennas (such as Yagi or parabolic) focus energy in a narrow beam, which gives longer range for a point-to-point link and less spill. Omnidirectional antennas radiate in all horizontal directions, wasting signal and spreading it around the area.

Answer: B. Uninterruptible power supply (UPS)

A UPS uses batteries to supply power immediately when utility power drops, giving runtime for short outages and graceful shutdowns. A PDU only distributes power to the devices in the rack; it stores no energy, so the equipment loses power the moment the source does.

Answer: C. Intermediate distribution frames (IDFs)

IDFs are the floor or area wiring closets that serve local users and connect back to the central equipment room. The ground-floor room with the demarc and core switches is the MDF, not the floor closets.