Home » Cisco » 350-080 » Which two statements about disjoint Layer 2 networks are true?
Which two statements about disjoint Layer 2 networks are true? (Choose two.)
A. Ethernet Switching mode must be end-host mode.
B. Overlapping vlans are supported.
C. Each vNIC can communicate with all the disjoint Layer 2 networks.
D. Symmetrical configuration is recommended for high availability.
E. Default VLAN 1 can be configured explicitly on an Uplink Ethernet Port or Port Channel
F. Appliance port cannot be configured with the same VLAN as Uplink Ethernet Port or Port Channel.
Correct Answer: AD
Explanation/Reference:
Explanation:
When you plan your configuration for upstream disjoint L2 networks, consider the following:
Ethernet Switching Mode Must Be End-Host Mode
Cisco UCS only supports disjoint L2 networks when the Ethernet switching mode of the fabric interconnects is configured for end-host mode. You cannot connect to disjoint L2 networks if the Ethernet switching mode of the fabric interconnects is switch mode.
Symmetrical Configuration Is Recommended for High Availability
If a Cisco UCS domain is configured for high availability with two fabric interconnects, we recommend that both fabric interconnects are configured with the same set of VLANs.
VLAN Validity Criteria Are the Same for Uplink Ethernet Ports and Port Channels
The VLAN used for the disjoint L2 networks must be configured and assigned to an uplink Ethernet port or uplink Ethernet port channel. If the port or port channel does not include the VLAN, Cisco UCS Manager considers the VLAN invalid and does the following:
Displays a configuration warning in the Status Details area for the server.
Ignores the configuration for the port or port channel and drops all traffic for that VLAN.
Reference: http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/2-0/b_UCSM_GUI_Configuration_Guide_2_0/b_UCSM_GUI_Configuration_Guide_2_0_chapter_010101.html (guidelines for configuring Upstream disjoint L2 networks)
