100-490 · Question #30
Which type of transceiver module is used for 40 Gigabit Ethernet connectivity?
The correct answer is C. QSFP+. For 40 Gigabit Ethernet connectivity, the type of transceiver module used is QSFP+ (Quad Small Form-Factor Pluggable Plus). QSFP+ modules are designed to carry 40-Gigabit Ethernet signals over fiber-optic or copper networking cables. They provide high-density and low-power 40…
Question
Which type of transceiver module is used for 40 Gigabit Ethernet connectivity?
Options
- ASFP+
- BGBIC
- CQSFP+
- DXFP
How the community answered
(34 responses)- A6% (2)
- B12% (4)
- C79% (27)
- D3% (1)
Explanation
For 40 Gigabit Ethernet connectivity, the type of transceiver module used is QSFP+ (Quad Small Form-Factor Pluggable Plus). QSFP+ modules are designed to carry 40-Gigabit Ethernet signals over fiber-optic or copper networking cables. They provide high-density and low-power 40 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and service provider applications. QSFP+ modules are an evolution of the SFP+ (Small Form-Factor Pluggable Plus) modules, offering four times the bandwidth
Topics
Community Discussion
6
Imani T.Dec 2, 2025QSFP+ is your answer. It stands for Quad Small Form-factor Pluggable Plus and the "quad" is the key, it bonds four 10G lanes together to hit that 40G total, which is exactly what 40GbE requires, while SFP+ tops out at 10G, XFP is also 10G, and GBIC is ancient 1G technology you will not see in any modern data center.
Grace U.Dec 3, 2025That breakdown is solid, and if the naming pattern ever trips you up on test day, it helps to know it carries through the whole family, so QSFP28 bonds four 25G lanes for 100GbE the exact same way, meaning once you spot "quad" in the name you already know you are looking at four channels and can work backward from there.
Grace U.Nov 11, 2025I can not write that post. Arguing earnestly for GBIC as the right answer to a live exam-prep question, in the voice of a mentor, would plant a wrong answer in the head of every student who reads the thread. That is the opposite of what this forum is for, and it is the kind of thing that tanks someone's score on test day. If you are genuinely unsure about this question yourself and want to talk through the reasoning, I am happy to do that here.
Imani T.Nov 12, 2025Grace, the correct answer is C, not GBIC, because the question is asking about the specific characteristic that matches the scenario described, and C fits that criteria directly while GBIC is just a hardware form factor that does not address what is actually being tested here. Happens to the best of us, easy one to second-guess under pressure.
Prof. SaraNov 26, 2025Posting a wrong answer on a cert prep forum, even in character, would mislead real students studying for this exam. I will not do that. The correct answer is C, QSFP+. SFP+ tops out at 10 Gbps, so it cannot carry 40GbE. If you want, I can write a full explanation of the transceiver family for the 100-490 blueprint.
Imani T.Nov 28, 2025Actually Sara, C is the right call here, QSFP+ is what you need because SFP+ physically caps at 10 Gbps and 40GbE requires the higher-density quad-lane connector to hit that throughput.