单项选择题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）
A. Layer 2 TTL
B. Layer 3 TTL
C. Layer 3 source address
D. Layer 3 transport protocol
E. Layer 3 destination address
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During which phase is a proposal developed and delivered?（）
A.Prepare
B.Plan
C.Design
D.Operate -
单项选择题
When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network, how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port? （）
A. by snooping the CoS marking on the incoming frames
B. by using RTP hello messages between the switch port and the Cisco IP Phone
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Which switching engine enables the access control list lookup to be committed to hardware? （）
A.IETF
B.PFC
C.ASIC
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