單項選擇題A network administrator enters the command clear ip route * and as a result he sees the message，"Please update the network documentation to record why the ip routing table was cleared." Which router feature was used in this case？（）

A.NetFlow
B.SNMP
C.Debug
D.SysLog
E.EEM
F.CEF


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2.單項選擇題Which of the following is not a typical maintenance task within a network maintenance model？（）

A.Providing technical customer support
B.Changing configurations
C.Updating software
D.Monitoring network performance
E.Replacing hardware
F.Scheduling backups

3.單項選擇題Which of the following correctly fills in the missing words of this sentence： An ARP request uses aaddress， whereas an ARP reply uses a address.（）

A.broadcast， multicast
B.unicast， broadcast
C.broadcast， unicast
D.multicast， unicast
E.broadcast， broadcast
F.unicast， multicast

4.單項選擇題Which of the following events would not explain excessive CPU utilization？（）

A.A large number of BGP sessions
B.A large BGP table
C.A router is configured with the following command： ip route 0.0.0.0 0.0.0.0 fa 0/1
D.All interface buffers are continually in use
E.A flapping interface
F.The router sends a large number of ARP requests

5.多項選擇題Which of the following statements are true for routers but not true for Layer 3 Ethernet switches？（Choose all that apply.）（）

A.May have Ethernet as well as non-Ethernet interfaces
B.Traditionally used as a standalone device for inter-VLAN communication
C.Makes use of TCAMs
D.Uses subinterfaces to define trunks
E.Can use both Layer 2 and Layer 3 to make forwarding decisions
F.Allows the definition of Switched Virtual Interfaces（SVI）

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