Which two are true with respect to the switching modes on the Cisco Unified Computing System
62XX Fabric Interconnect? (Choose two.)
A.
End-host mode presents a link to a northbound uplink switch as a host trunk with loop detection
that is provided by STP.
B.
For northbound traffic, server MAC addresses are statically pinned to an uplink; the return path
is controlled by the unified fabric switches.
C.
A fabric interconnect port in Ethernet switching mode appears to the uplink switch as a host
with many MAC addresses.
D.
Server-to-server traffic on a common VLAN are locally switched by the fabric interconnect and
not the northbound switches.
E.
A MAC forwarding table is not used to forward traffic to the uplink switch.
F.
A MAC address forwarding table is maintained for server-to-server communications across
VLANs.
This does not specify the switching mode used
Cisco supports two types
• Ethernet end-host mode, sometimes referred to as Ethernet host virtualizer
• Traditional Ethernet switch mode
By default it uses the End Host mode
In end-host mode, Cisco UCS presents an end host to an external Ethernet network. The external LAN sees the Cisco UCS fabric interconnect as an end host with multiple adapters
End-host mode features include:
• Spanning Tree Protocol is not run on both the uplink ports and the server ports.
• MAC address learning occurs only on the server ports; MAC address movement is fully supported.
• Links are active-active regardless of the number of uplink switches.
• The system is highly scalable because the control plane is not occupied.
Unicast traffic paths in Cisco UCS
• Each server link is pinned to exactly one uplink port (or PortChannel).
• Server-to-server Layer 2 traffic is locally switched.
• Server-to-network traffic goes out on its pinned uplink port.
• Network-to-server unicast traffic is forwarded to the server only if it arrives on a pinned uplink port. This feature is called the reverse path forwarding (RPF) check.
• Server traffic received on any uplink port, except its pinned uplink port, is dropped (called the deja-vu check)
• The server MAC address must be learned before traffic can be forwarded to it.
for this best to see this but answer D and E do look right for this switching mode
http://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/unified-computing/whitepaper_c11-701962.html
“B” is wrong because of word “statically”.