單項(xiàng)選擇題What is an important consideration that should be taken into account when configuring shaped round robin？（）

A.It enables policing.
B.Strict priority is not supported.
C.WRED must be previously enabled.
D.It enables WRR


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2.多項(xiàng)選擇題The network administrator wants to enable an EtherChannel between two switches in "on" mode. The administrator connects the cables and enables the interfaces， but while configuring the EtherChannel in the first switch，a spanning-tree loop was detected. Which two of these procedures can avoid this problem？（）

A.Configure the EtherChannel as "desirable" first.
B.Assign all interfaces to the same VLAN.
C.Disable PortFast on the interfaces in the EtherChannels.
D.Disable all interfaces first.
E.Fast Ethernet and Gigabit Ethernet ports cannot be assigned to the same EtherChannel.
F.Fix cabling problems.

3.單項(xiàng)選擇題

Refer to the exhibit. Based on this configuration， what type of marker is achieved？（）

A.Single-rate， two-color marker
B.Three-rate， two-color marker
C.Two-rate， three-color marker
D.Single-rate， three-color marker

4.單項(xiàng)選擇題Before inserting a new switch in the network，the network administrator checks that the VTP domain name is correct，the VTP mode is set to server， and revision is lower than the switches in the network. The administrator then configures interfaces and trunks，erases existing VLANs，and connects the switch to the network. Following that procedure，there is no connectivity in the network. What is a possible cause of this problem？（）

A.Because the configuration revision of the new switches is lower than the rest of the network， it can change the VLAN database of the other switches.
B.As a VTP server， the new switch deleted all VLANs of the network.
C.Erasing VLANs increases the VTP configuration revision.
D.Since the configuration revision of the network is higher than the new switch， the VLAN database was automatically synchronized.