UUS Practice Tests⌕ Search
IT Certifications · 98-366

Exam 98-366: Networking Fundamentals Practice Test

Exam 98-366: Networking Fundamentals practice covers core concepts used to connect devices and move data across local and routed networks. The available questions sample IP addressing, subnet routing, Ethernet switching, wireless channel planning, network security, and the selection of copper, fiber, or network-edge equipment for particular connectivity needs.

Exam overview

Exam providerMicrosoft
Exam code98-366
CategoryIT Certifications

About the Exam 98-366: Networking Fundamentals Exam

Networking work involves identifying where traffic should travel and which device or service performs each function. Practice distinguishing switches that forward Ethernet frames using MAC addresses from routers that direct IP packets between networks, and consider how prefix length affects route selection. Address configuration scenarios by recognizing DHCP leases and reservation-based approaches for consistent addresses. Security questions may contrast stateful inspection, which tracks connection state, with stateless packet filtering. Physical-layer decisions include selecting fiber where distance or electromagnetic interference makes it suitable, while wireless troubleshooting can involve reducing channel overlap in the 2.4 GHz band. These concepts support tasks such as connecting a LAN to an ISP, diagnosing reachability or performance issues, and matching network requirements to appropriate infrastructure.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

Which device is primarily responsible for forwarding IP packets between separate IP networks?

  1. ARouter
  2. BRepeater
  3. CUnmanaged Ethernet hub
  4. DWireless access point operating as a bridge
Show answerCorrect answer: A

A router forwards packets between IP networks using network-layer addressing and routing information. The other listed devices primarily repeat signals or bridge local-network traffic.

Question 2

What is the main purpose of a firewall in a network?

  1. ATo filter network traffic according to configured security rules
  2. BTo increase the signal strength of wireless transmissions
  3. CTo assign hardware addresses to Ethernet interfaces
  4. DTo convert domain names into IP addresses
Show answerCorrect answer: A

A firewall permits or blocks network traffic based on rules such as addresses, protocols, ports, and connection state. It does not replace services such as DNS or wireless signal equipment.

Question 3

A network technician is choosing between a stateful firewall and a simple stateless packet filter. What is a typical capability of a stateful firewall?

  1. AIt tracks connection state so that rules can treat packets according to their relationship to established sessions
  2. BIt converts every hostname into a MAC address
  3. CIt guarantees that all permitted traffic is free of malware
  4. DIt replaces the need for IP addressing
Show answerCorrect answer: A

A stateful firewall maintains information about active connections and can use that context when evaluating packets. This differs from a basic stateless filter, which evaluates packets against rules without tracking session state.

Question 4

A workstation needs an IP address that remains the same after it restarts. Which approach best provides this on a network using DHCP?

  1. AConfigure a DHCP reservation for the workstation's network adapter
  2. BReduce the DHCP lease duration
  3. CEnable APIPA on the workstation
  4. DAssign the workstation a different default gateway
Show answerCorrect answer: A

A DHCP reservation associates a device's hardware address with a particular IP address, so the DHCP server can consistently offer that address. A shorter lease does not make an address persistent, and APIPA is for limited connectivity when DHCP is unavailable.

Question 5

A company needs to connect two buildings several kilometers apart and expects electromagnetic interference near the cable route. Which medium is generally the best fit?

  1. AUnshielded twisted-pair copper
  2. BFiber-optic cable
  3. CTelephone-grade copper pair
  4. DUnshielded parallel wire
Show answerCorrect answer: B

Fiber-optic cable supports long-distance links and is resistant to electromagnetic interference because it carries light rather than electrical signals. Copper Ethernet cabling has distance limits and is more susceptible to electrical interference.

Question 6

A network has several IPv4 subnets, and a router must choose among routes with different prefix lengths that all match a destination address. Which route-selection principle generally determines the most specific match?

  1. AChoose the route with the longest matching prefix
  2. BChoose the route with the numerically smallest next-hop address
  3. CChoose the route with the oldest installation date
  4. DChoose the route with the largest subnet mask value when written as a decimal number
Show answerCorrect answer: A

Routers generally use longest-prefix matching: among matching routes, the one with the most leading network bits is the most specific and is selected, subject to routing policy and route validity.

Question 7

A network technician is troubleshooting poor Wi-Fi performance caused by several nearby access points using overlapping channels in the 2.4 GHz band. Which change is most likely to reduce channel overlap?

  1. AConfigure nearby access points to use non-overlapping channels where possible
  2. BAssign every access point the same channel regardless of location
  3. CDisable encryption on all access points
  4. DReplace each access point’s IP address with a different subnet mask
Show answerCorrect answer: A

In the 2.4 GHz band, choosing non-overlapping channels for nearby access points can reduce co-channel or adjacent-channel interference. The available channel plan depends on the regulatory domain and local environment.

How to use this practice test

The free US Practice Tests practice session draws up to 20 random questions from the 50-question bank for Exam 98-366. Answer scenarios on addressing, routing, switching, firewalls, cabling, and Wi-Fi, then use the displayed results to identify concepts that need another review.

Preparation tips

  • Trace sample IPv4 destinations through overlapping routes and identify why the longest matching prefix is selected.
  • Compare DHCP leases, reservations, and manually configured addresses; note which approach supports a stable address while retaining centralized configuration.
  • Sketch how frames and packets move through a LAN switch, an edge router, and a firewall, labeling MAC- and IP-based decisions.
  • Review fiber and copper tradeoffs for distance and electromagnetic interference, then map 2.4 GHz channel overlap to practical access-point changes.
Official sourceOfficial exam page ↗