单项选择题

Prior to 802.1w，Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct？（）

A.Only UplinkFast and BackboneFast are specified in 802.1w；PortFast must be manually configured.
B.Only PortFast is specified in 802.1w；UplinkFast and BackboneFast must be manually configured.
C.None of the proprietary Cisco enhancements are specified in 802.1w.
D.PortFast，UplinkFast，and BackboneFast are specified in 802.1w.

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启用SSH的步骤是什么？

单项选择题

On the basis of the definitions of different services in various RFCs，traffic with Expedited Forwarding per-hop behavior should be marked as which of these？（）

A.IP ToS of 0xEF
B.IP experimental ECN
C.DSCP decimal 5
D.Binary value of 101110

单项选择题

Which is the result of enabling IP Source Guard on an untrusted switch port that does not have DHCP snooping enabled？（）

A.DHCP requests will be switched in the software， which may result in lengthy response times.
B.The switch will run out of ACL hardware resources.
C.All DHCP requests will pass through the switch untested.
D.The DHCP server reply will be dropped and the client will not be able to obtain an IP address.