010-151 · Question #136
Which statement is true about QSFP?
The correct answer is A. The four 10 Gbit/sec channels that QSFP+ supports can be combined into a single 40 Gigabit. QSFP+ uses four independent 10 Gbps lanes that are bonded together to deliver 40 Gbps aggregate throughput over a single transceiver.
Question
Which statement is true about QSFP?
Options
- AThe four 10 Gbit/sec channels that QSFP+ supports can be combined into a single 40 Gigabit
- BQSFP-DD stands for Quad Small Form Factor Pluggable Double Distance.
- CThe QSFP+ offers higher data speed than QSFP28.
- D100GBASE-SR4 supports a much longer distance than 100GBASE-LR4.
How the community answered
(37 responses)- A84% (31)
- B3% (1)
- C5% (2)
- D8% (3)
Why each option
QSFP+ uses four independent 10 Gbps lanes that are bonded together to deliver 40 Gbps aggregate throughput over a single transceiver.
QSFP+ (Quad Small Form-Factor Pluggable Plus) is defined by its use of four 10 Gbps electrical channels bonded via IEEE 802.3ba channel aggregation to produce a total 40 Gbps link, which is the core architectural distinction of QSFP+ in 40GbE deployments.
QSFP-DD stands for Quad Small Form-Factor Pluggable Double Density, not Double Distance - the 'DD' refers to doubling the number of electrical lanes from 4 to 8 to support higher-speed interfaces.
QSFP28 supports 100 Gbps (4 x 25 Gbps lanes) while QSFP+ only supports 40 Gbps (4 x 10 Gbps lanes), meaning QSFP28 has the higher data speed.
100GBASE-SR4 is a short-reach optic rated for approximately 70-100 meters on OM4 multimode fiber, while 100GBASE-LR4 supports up to 10 km over single-mode fiber, making LR4 the longer-distance variant.
Concept tested: QSFP+ channel bonding and form factor specifications
Source: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/white-paper-c11-740585.html
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