Network Implementations
Free CompTIA Network+ practice — 6 questions on Network Implementations, with explanations. No sign-up. Full 12-question mixed test →
A network has four switches participating in STP: SW1 (priority 32768, MAC 00:11:22:33:44:55), SW2 (priority 24576, MAC 00:99:88:77:66:55), SW3 (priority 32768, MAC 00:00:11:11:22:22), and SW4 (priority 4096, MAC 00:AA:BB:CC:DD:EE). Which switch will be elected the root bridge?
The root bridge is the switch with the lowest Bridge ID, which is priority compared first, then MAC address as a tiebreaker. SW4's priority of 4096 is the lowest of all four values, so it wins regardless of its MAC address.
A service provider needs to exchange routing information with multiple independent autonomous systems belonging to other organizations across the internet, requiring policy-based path selection rather than pure metric-based shortest path. Which routing protocol is designed for this use case?
BGP is a path-vector, exterior gateway protocol built specifically for inter-AS routing on the internet, supporting policy-based decisions (AS-path, local preference, communities) rather than simple metrics.
Two switches are connected via an 802.1Q trunk. Switch A is configured with native VLAN 1 on the trunk port, while Switch B is configured with native VLAN 99 on the same trunk port. Untagged frames sent from Switch A are unexpectedly appearing in VLAN 99 on Switch B. What configuration issue is occurring?
Each switch strips the tag from frames destined to its own configured native VLAN before sending untagged, and the receiving switch assumes untagged frames belong to its own native VLAN. When the native VLAN numbers differ, untagged frames effectively leak from one VLAN into another, which is exactly the described symptom and a known VLAN-hopping risk.
A company uses PAT to allow 300 internal hosts to share a single public IP address for internet access. During peak usage, users experience intermittent connection failures, and the engineer confirms the NAT translation table is near capacity. Which explanation and remediation BEST addresses this issue?
PAT distinguishes translations using the source port number, a 16-bit field, capping concurrent sessions at roughly 65,536 per public IP. Adding more public IP addresses to the NAT pool multiplies available port space, resolving exhaustion during peak load.
An organization needs a 10GbE link between two buildings located 300 meters apart, connected via single-mode fiber. Which transceiver should be installed to support this distance and cable type?
10GBASE-LR is designed for single-mode fiber and supports distances up to approximately 10 kilometers, comfortably covering the 300-meter run described.
Which statement accurately describes Wi-Fi 6E as defined in the 802.11ax amendment extension?
Wi-Fi 6E extends Wi-Fi 6 into the new 6 GHz spectrum, offering more non-overlapping channels and wider channel widths (up to 160 MHz), but only client devices with radios explicitly supporting 6 GHz can connect there; legacy devices simply cannot see or use that band.
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