单项选择题

Which of the following options represents the correct sequence of DHCP messages after a clientinitially boots？（）

A.DHCPREQUEST， DHCPOFFER， DHCPDISCOVER， DHCPACK
B.DHCPDISCOVER， DHCPOFER， DHCPREQUEST， DHCPACK
C.DHCPOFFER， DHCPACK， DHCPREQUEST， DHCPDISCOVER
D.DHCPDISCOVER， DHCPREQUEST， DHCPOFFER， DHCPACK
E.DHCPREQUE5T， DHCPDISCOVER， DHCPOFFER， DHCPACK
F.DHCPDISCOVER， DHCPACK， DHCPREQUEST， DHCPOFFER

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多项选择题

Which of the following would be considered reasonable network maintenance tasks？（Choose allthat apply.）（）

A.Ensuring compliance with legal regulations and corporate policies
B.Troubleshooting problem reports
C.Planning for network expansion
D.Providing support to sales and marketing
E.Giving presentations to management
F.Monitoring and tuning network performance

多项选择题

You examine the port statistics on a Cisco Catalyst switch and notice an excessive number offrames are being dropped. Which of the following are possible reasons for the drops？（）

A.Unknown destination MAC address
B.Bad cabling
C.MAC forwarding table is full
D.Port configured for half duplex
E.Port configured for full duplex
F.Network congestion

多项选择题

Which of the following is a valid host IPv6 address？（Choose all that apply.）（）

A.ff02：a：b：c：：l/64
B.2001：aaaa： 1234：456c： 1/64
C.2001：000a：lb2c：：/64
D.2fff：f：f：f：：f/64
E.ff02：33ab：l：32：：2/128
F.2001：bad：2345：a：b：：cef/128