单项选择题
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switchedLAN？（）
A.after broken links are re-established
B.in an improperly implemented redundant topology
C.when upper-layer protocols require high reliability
D.during high traffic periods
E.when a dual ring topology is in use
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单项选择题
Whichcommandsetsandautomaticallyencryptstheprivilegedenablemodepassword？（）
A.enbale password c1sco
B.secret enable c1sco
C.password enable c1sco
D.enable secret c1sco -
单项选择题
Whichstatementistrue？（）
A.An IPv6 address is 64 b long and is represented as hexadecimal characters.
B.An IPv6 address is 32 b long and is represented as decimal digits.
C.An IPv6 address is 128 b long and is represented as decimal digits.
D.An IPv6 address is 128 b long and is represented as hexadecimal characters -
多项选择题
A company is installing IP phones. The phones and office computers connect to the same devicE.To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffiC.What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? （）
A.hub
B.router
C.switch
D.STP
E.subinterfaces
F.VLAN
