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？（）

多项选择题Whichofthefollowingroutermodelswillsupport1000tunnels？（）

A.2811
B.2801
C.2851
D.2821
E.1841
F.3825

单项选择题Whichofthefollowingisnotatypicalmaintenancetaskwithinanetworkmaintenancemodel？（）

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

单项选择题Whichofthefollowingcorrectlyfillsinthemissingwordsofthissentence：AnARPrequestusesaaddress，whereasanARPreplyusesaaddress.（）

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

单项选择题WhichofthefollowingeventswouldnotexplainexcessiveCPUutilization？（）

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

多项选择题WhichofthefollowingstatementsaretrueforroutersbutnottrueforLayer3Ethernetswitches？（Chooseallthatapply.）（）

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）