CV0-002 · Question #144
After an administrator deployed a private cloud a couple of years ago, users have started reporting that the network is getting slower. The administrator looks at the monitoring tools and notices…
The correct answer is D. There are too many devices broadcasting on the subnet. Despite supernetting and low switch port utilization, a private cloud network is slow, indicating a problem beyond simple bandwidth exhaustion.
Question
After an administrator deployed a private cloud a couple of years ago, users have started reporting that the network is getting slower. The administrator looks at the monitoring tools and notices that, even though supernetting was used to allow for 8,000 more VMs, the most utilized switch port in the datacenter is only using 40% of its total throughput speed. Which of the following is MOST likely the problem?
Options
- AThe number of VMs using 1Pv4 is causing the network to crash.
- BEach host only has two links to the network, and they are becoming saturated.
- CThe network only has 4Gbps HBAs when all cloud networks should be using 10Gbps.
- DThere are too many devices broadcasting on the subnet.
How the community answered
(38 responses)- A24% (9)
- B8% (3)
- C13% (5)
- D55% (21)
Why each option
Despite supernetting and low switch port utilization, a private cloud network is slow, indicating a problem beyond simple bandwidth exhaustion.
While a large number of IPv4 VMs are present, the question states supernetting was used and the network is slow, not crashing, making this less likely than broadcast overload.
If host links were saturated, the switch port utilization would be high, but the question explicitly states the most utilized switch port is only at 40%, contradicting this option.
The network's HBA speed is not the most likely problem because the most utilized switch port is only at 40% throughput, indicating available capacity.
A large number of devices on a single subnet, especially when supernetting is used to accommodate 8,000 VMs, significantly increases broadcast traffic, consuming network bandwidth and CPU resources on all devices and leading to perceived network slowness even if raw throughput is not maxed out.
Concept tested: Network segmentation and broadcast domains
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/DC_3_0/DC-3_0_Design_Guide_Chap3.html
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