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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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.

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