20+ practice questions focused on Infrastructure — one of the most tested topics on the Cisco Certified Support Technician - Networking exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Infrastructure PracticeWhich component of the Cisco network architecture is responsible for providing high-speed switching and fast transport between different areas of the network?
Explanation: The Cisco three-layer hierarchical model includes the Core, Distribution, and Access layers. The Core layer is specifically designed for high-speed switching and transport. It provides a reliable, high-bandwidth backbone that connects different parts of the enterprise, ensuring that traffic is moved across the network with minimal latency and high availability.
A technician is connecting a new Cisco Catalyst access switch to an existing IDF patch panel. The run to the distribution switch is approximately 60 meters through a cable tray that also carries fluorescent lighting ballasts. The technician needs a cable that supports 1 Gbps and is immune to the electromagnetic interference generated in the tray. Which cable type should be used?
Explanation: Fiber optic cabling transmits light instead of electrical signals, which means it cannot be affected by the electromagnetic interference radiated by fluorescent ballasts sharing the same tray. Multimode fiber also comfortably exceeds the 60-meter distance while delivering 1 Gbps. Copper options, whether shielded or not, remain vulnerable to conducted noise in that environment.
A network engineer is designing a small office network that requires high-speed connections between switches and to a server. The engineer wants to use Ethernet technology that supports full-duplex communication and can operate over twisted-pair copper cabling. Which two Ethernet standards meet these requirements? (Choose two.)
Explanation: 1000BASE-T and 10GBASE-T are Ethernet standards that operate over twisted-pair copper cabling and support full-duplex communication. 1000BASE-T provides 1 Gbps, while 10GBASE-T provides 10 Gbps, both suitable for high-speed connections. The other options either use fiber optic cabling or do not provide sufficient speed for the described requirements.
A network administrator is troubleshooting connectivity issues on a Cisco switch. A workstation connected to port FastEthernet 0/5 cannot reach the file server on the same VLAN. The administrator runs the 'show interface FastEthernet 0/5' command and sees the following output: 'FastEthernet0/5 is up, line protocol is down'. What is the most likely cause of the problem?
Explanation: The output 'up, line protocol is down' indicates that the physical layer is operational but the data link layer is not. On a Cisco switch, this often occurs when the VLAN assigned to the port is not active or does not exist. The switch cannot forward frames without a valid VLAN, so the line protocol goes down.
A network administrator is planning the IPv4 addressing for a small branch office that will contain 45 hosts on a single subnet. The administrator wants to conserve addresses and use the smallest subnet mask that still accommodates all hosts. Which subnet mask should be configured?
Explanation: Supporting 45 hosts requires at least 6 host bits, because 2^6 minus 2 equals 62 usable addresses, while 5 host bits give only 30. Six host bits correspond to a /26 mask, written as 255.255.255.192. This is the smallest subnet that accommodates the branch while minimizing wasted addresses.
+15 more Infrastructure questions available
Practice all Infrastructure questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Infrastructure. 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
Infrastructure questions on the 100-150 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. Infrastructure is tested as part of the Cisco Certified Support Technician - Networking blueprint. Practicing with targeted Infrastructure questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free 100-150 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 Infrastructure 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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