单项选择题

Refer to the exhibit. Which switching feature is being tested？（）

A. loop guard
B. PortFast
C. root guard
D. BDPU guard

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多项选择题

Which two options does Cisco PfR use to control the entrance link selection with inbound optimization？（）

A.Prepend extra AS hops to the BGP prefix.
B.Advertise more specific BGP prefixes （longer mask）.
C.Add （prepend） one or more communities to the prefix that is advertised by BGP.
D.Have BGP dampen the prefix.

多项选择题

Which three combinations are valid LACP configurations that will set up a channel？（）

A.On/On
B.On/Auto
C.Passive/Active
D.Desirable/Auto
E.Active/Active
F.Desirable/Desirable

单项选择题

In 802.1s， how is the VLAN to instance mapping represented in the BPDU？（）

A.The VLAN to instance mapping is a normal 16-byte field in the MST BPDU.
B.The VLAN to instance mapping is a normal 12-byte field in the MST BPDU.
C.The VLAN to instance mapping is a 16-byte MD5 signature field in the MST BPDU.
D.The VLAN to instance mapping is a 12-byte MD5 signature field in the MST BPDU.