20+ practice questions focused on Network Fundamentals — one of the most tested topics on the Cisco DevNet Associate 200-901 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Network Fundamentals PracticeA network engineer is troubleshooting slow connectivity between two sites connected via a WAN link. The engineer suspects packet loss due to collisions. Which interface counter should be examined to confirm this?
Explanation: CRC (Cyclic Redundancy Check) errors indicate that frames received on an interface have failed the integrity check, which is often caused by physical-layer issues such as collisions, faulty cabling, or signal degradation. In the context of a WAN link, collisions are not typical (since full-duplex is standard), but if the link is misconfigured as half-duplex, collisions can occur and will manifest as CRC errors. Thus, examining the CRC errors counter is the correct way to confirm packet loss due to collisions.
A DevOps team is deploying a containerized application across multiple hosts. They need to ensure that traffic between containers on the same host is isolated from other tenants. Which network implementation best meets this requirement?
Explanation: VXLAN overlays with a distributed virtual switch provide Layer 2 isolation across multiple hosts by encapsulating Ethernet frames in UDP packets (RFC 7348). This creates independent virtual networks (VXLAN segments) that can span hosts, ensuring traffic between containers on the same host is isolated from other tenants without relying on physical network topology.
An engineer notices that a switch port configured as an access port in VLAN 10 is not forwarding traffic. The switch shows the port is up/up. What is the most likely cause?
Explanation: An access port expects to receive and send only untagged frames, as it belongs to a single VLAN (VLAN 10). If the connected device sends 802.1Q tagged frames, the switch will drop them because the access port does not process VLAN tags. This explains why the port is up/up but not forwarding traffic.
A network administrator is configuring SNMPv3 on a router for secure monitoring. Which combination of parameters is required to ensure authentication and encryption?
Explanation: SNMPv3 with authPriv is the correct combination because it enables both authentication (via HMAC-MD5 or HMAC-SHA) and encryption (via DES or AES) to ensure secure monitoring. The authPriv security level provides message integrity, origin authentication, and data confidentiality, meeting the requirement for both authentication and encryption.
During a network migration, an engineer needs to replace a legacy core switch with a new one without disrupting the existing STP topology. The new switch supports RSTP and will be connected via two trunk links. Which configuration should be applied to the new switch to prevent it from becoming the root bridge?
Explanation: Option B is correct because setting the bridge priority to 61440 (which is a valid priority value in increments of 4096) ensures the new switch has a higher numerical priority than the current root bridge, preventing it from becoming the root. In STP/RSTP, the switch with the lowest bridge priority becomes the root bridge; by configuring a high priority, the new switch will not disrupt the existing topology.
+15 more Network Fundamentals questions available
Practice all Network Fundamentals questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Network Fundamentals. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Network Fundamentals questions on the 200-901 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Network Fundamentals is tested as part of the Cisco DevNet Associate 200-901 blueprint. Practicing with targeted Network Fundamentals questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free 200-901 practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but Network Fundamentals is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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