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多項選擇題Which three of these statements regarding 802.1Q trunking are correct？（）

A.802.1Q native VLAN frames are untagged by default.
B.802.1Q trunking ports can also be secure ports.
C.802.1Q trunks can use 10 Mb/s Ethernet interfaces.
D.802.1Q trunks require full-duplex， point-to-point connectivity.
E.802.1Q trunks should have native VLANs that are the same at both ends.

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1.多項選擇題Which two subnetworks would be included in the summarized address of 172.31.80.0 /20? （）

A.172.31.17.4/30
B.172.31.51.16/30
C.172.31.64.0/18
D.172.31.80.0/22
E.172.31.92.0/22
F.172.31.192.0/18

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2.多項選擇題MAC的作用是什么？（）

A.在二層唯一確定一臺設(shè)備
B.是設(shè)備在不同的網(wǎng)絡(luò)中通信
C.區(qū)別二層和三層幀
D.確定設(shè)備的優(yōu)先級
E.是同一網(wǎng)絡(luò)的不同設(shè)備可以通信
F.當(dāng)不知道遠(yuǎn)程設(shè)備的物理地址時可以查詢

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3.多項選擇題Which two of these statements regarding RSTP are correct？（）

A.RSTP cannot operate with PVST+.
B.RSTP defines new port roles.
C.RSTP defines no new port states.
D.RSTP is a proprietary implementation of IEEE 802.1D STP.
E.RSTP is compatible with the original IEEE 802.1D STP.

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4.單項選擇題A cisco router is booting and has just completed the POST process.It is now ready to find and load an IOSimage.what function does the router perform next?（）

A.It checks the configuration register
B.It attempts to boot from a TFTP server
C.It loads the first image file in flash memory
D.It inspects the configuration file in NVRAM for boot instructions

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5.單項選擇題Which command enables IPv6 forwarding on a cisco router?（）

A.ipv6 host
B.ipv6 unicast-routing
C.ipv6 local
D.ipv6 neighbor

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