問答題在frame-relay中，哪種情況為出現(xiàn)接口協(xié)議down，物理up的情況！

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1.單項選擇題You are about to migrate a customer network to use a VSS. Which of these statements is true about a VSS？（）

A.The VSS switch must be the root bridge for all VLANs and is automatically designated.
B.The VSS switch is defined in RFC 4318 as a managed object.
C.The PAgP+ or LACP protocols are used to maintain the operational state of the VSS devices.
D.A VSS interoperates with a virtual port channel.
E.The 802.1Q or ISL protocols are used to maintain the operational state of the VSS devices.
F.A VSS increases the size of the spanning-tree domain.

3.單項選擇題

Refer to the exhibit. When applying this hierarchical policy map on the on the tunnel1 interface, you measure high jitter for traffic going through class 1234. What is the most likely cause of this jitter?（）

A.The configuration of a hierarchical policy map on a tunnel interface is not supported.
B.Class 5555 and class 5554 are both taking up 100% of the bandwidth，leaving nothing for class 1234.
C.The burst size for the traffic shaping is wrongly configured to 15000；this would require an interface capable of sending at 150Mb/s.
D.The burst size for the traffic shaping has been wrongly configured；it should be set as low as possible.
E.The burst size for the traffic shaping has been wrongly configured；it should be set as high as possible.

5.單項選擇題You are the network administrator of an enterprise with a main site and multiple remote sites. Your network carries both VOIP and data traffic. You agree with your service provider to classify VOIP and data traffic according to the different service RFCs. How can your data and VOIP traffic be marked？（）

A.data marked with DSCP AF21，VOIP marked with DSCP EF
B.data marked with DSCP AF51，VOIP marked with DSCP EF
C.data marked with the DE-bit，VOIP marked with the CLP-bit
D.data marked with DSCP EF，VOIP marked with DSCP AF31
E.data marked with IP precedence 5 VOIP marked with DSCP EF