Which three statements are true about an EtherChannel? (Choose three.)
A.
PAGP and LACP can be configured on the same switch if the switch is not in the same
EtherChannel.
B.
EtherChannel ports in suspended state can receive BPDUs but cannot send them.
C.
An EtherChannel forms between trunks that are using different native VLANs.
D.
LACP can operate in both half duplex and full duplex, if the duplex setting is the same on both
ends.
E.
Ports with different spanning-tree path costs can form an EtherChannel.
Answer A. EtherChannel groups running PAgP and LACP can coexist on the same switch or on
different switches in the stack. Individual EtherChannel groups can run either PAgP or LACP, but
they cannot interoperate.
Answer B:
EtherChannel Member Port States
Port States
Description
bundled
The port is part of an EtherChannel and can send and receive BPDUs and data traffic.
suspended
The port is not part of an EtherChannel. The port can receive BPDUs but cannot send them. Data
traffic is blocked.
Cisco 400-101 Exam
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standalone
The port is not bundled in an EtherChannel. The port functions as a standalone data port. The port
can send and receive BPDUs and data traffic.
Answer E. Ports with different spanning-tree path costs can form an EtherChannel if they are
otherwise compatibly configured. Setting different spanning-tree path costs does not, by itself,
make ports incompatible for the formation of an EtherChannel.
Reference. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-
0_2_EX/layer2/configuration_guide/b_lay2_152ex_2960-x_cg/b_lay2_152ex_2960-
x_cg_chapter_010.html
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According to https://en.wikipedia.org/wiki/Link_aggregation – “… IEEE standard requires is that each link be full duplex…”
D is false.
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According to https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/etherchannel.html
“suspended – The port is not part of an EtherChannel. The port can receive BPDUs but cannot send them. Data traffic is blocked.”
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