Which two actions must occur to disable the LAN traffic on an FCoE link to a host? (Choose two.)
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A. B. C. D. E.AB.
Before diving into the answer choices, it's important to understand some background information about FCoE and how it works.
FCoE stands for Fibre Channel over Ethernet, which is a protocol used to transmit Fibre Channel storage traffic over Ethernet networks. Essentially, it allows Fibre Channel traffic to be transported over Ethernet links, which reduces the need for separate Fibre Channel networks.
When an FCoE link is established between a switch and a host (which is typically a Converged Network Adapter or CNA), two different types of traffic are transported over the same physical link:
In order to disable the LAN traffic on an FCoE link to a host, we need to perform the following two actions:
Now let's take a closer look at each answer choice and determine whether it satisfies these two requirements:
A. interface Ethernet 1/1 shutdown lan This command would disable the LAN functionality on the Ethernet interface, but it wouldn't notify the host that the LAN functionality has been disabled. Therefore, this answer choice doesn't satisfy both requirements.
B. The switch sends a LAN logical link status message to the CNA host. This answer choice satisfies the second requirement (notifying the host), but it doesn't satisfy the first requirement (disabling the LAN functionality on the link). Therefore, this answer choice alone isn't sufficient.
C. interface vfc11 shutdown lan This command would disable the LAN functionality on the virtual Fibre Channel interface (vfc11), which is the interface that's used to transport FCoE traffic between the switch and the CNA. Additionally, this command would also notify the host that the LAN functionality has been disabled. Therefore, this answer choice satisfies both requirements and is a correct answer.
D. The switch sends a PFC command to the CNA host. This answer choice doesn't actually disable the LAN functionality on the link; instead, it's referring to Priority Flow Control (PFC), which is a mechanism used to prioritize traffic on a converged network (i.e. a network that carries both storage and LAN traffic). While PFC can be used to manage bandwidth and ensure that storage traffic gets priority over LAN traffic, it doesn't directly disable the LAN functionality. Therefore, this answer choice is incorrect.
E. interface Ethernet 1/1 vlan 10 disable. This command would disable VLAN 10 on the Ethernet interface, but it wouldn't disable the LAN functionality on the FCoE link. Additionally, it wouldn't notify the host that the LAN functionality has been disabled. Therefore, this answer choice doesn't satisfy both requirements.
In summary, the two correct answers are: