Worth 20% of the CompTIA Network+ (N10-009) exam. CertClue has 78 questions on this objective.
Objective 2.4 covers the physical side: racks, power, cooling and cable termination. Questions describe an installation constraint and expect the correct standard or practice.
Exam tip. Modern switches auto-negotiate crossover with MDI-X, so a crossover cable is rarely required. Expect questions that test whether you know the standards even though the need has largely disappeared.
These three services underpin almost every network. Questions test how each is configured, what happens when each fails, and how they behave across subnets.
Exam tip. If clients on one subnet get addresses and another subnet does not, the answer is a missing DHCP relay or IP helper, not a server fault.
Network address translation lets private addresses reach the internet. Questions test the difference between the translation types and what breaks when translation is misconfigured.
Exam tip. If a scenario has hundreds of internal hosts and a single public address, the answer is PAT. Static NAT is only correct when a specific host must be individually reachable.
WAN questions match a connectivity requirement to a technology, weighing bandwidth, latency, cost and availability at a given location.
Exam tip. Watch for the words guaranteed, symmetric or service level agreement. Those requirements rule out consumer broadband regardless of the headline speeds offered.
IPv6 implementation questions cover address types, how addresses are assigned without DHCP, and how organisations run both protocols during migration.
Exam tip. If a host has only an fe80:: address, it received no router advertisement and no DHCPv6 response. Treat this exactly as you would an IPv4 APIPA address.
VPN questions test which topology suits a requirement and which protocol provides which protection. Split tunnelling appears frequently as a security trade-off.
Exam tip. Split tunnelling is the answer when performance or bandwidth is the concern, and the wrong answer when the requirement is inspecting or controlling all user traffic.
Objective 2.1 covers routing technologies. You need to distinguish static from dynamic, know the main protocols and their metrics, and understand how a router chooses between competing routes.
Exam tip. Longest prefix match is applied before administrative distance. A more specific route from a less trusted protocol still wins over a less specific route from a more trusted one.
Switching questions centre on segmentation and loop prevention. VLANs divide broadcast domains logically; spanning tree stops the broadcast storms that loops would otherwise cause.
Exam tip. A network that collapses after someone patches two switch ports together has a layer 2 loop. If spanning tree were enabled and working, the redundant port would have been blocked automatically.
Objective 2.3 covers wireless implementation. Beyond the standards themselves, you need channel planning, antenna choice and the difference between SSID design decisions.
Exam tip. When several access points cover one area, the correct design is one SSID with non-overlapping channels, not a separate SSID per access point.
Free, with the answer and the reasoning. No account needed.
1. Which feature separates IP phone traffic from desktop traffic on a single switch port shared by both?
A voice VLAN allows a phone and the desktop connected through it to sit in separate VLANs on one physical port, enabling separate addressing and QoS treatment. Port mirroring copies traffic for analysis, loopback interfaces are logical addresses, and jumbo frames increase MTU.
2. A network administrator wants to logically separate traffic for the accounting and marketing departments on the same physical switches, without running separate cabling for each. Which switch feature should be configured?
VLANs logically segment a switch into separate broadcast domains, isolating traffic between groups like departments on the same physical infrastructure. Port mirroring copies traffic from one port to another for monitoring, Spanning Tree Protocol prevents Layer 2 loops, and PoE delivers power over Ethernet cabling, none of which segment traffic logically.
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