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多項選擇題哪兩個命令可以用來驗證給定的Cisco交換機的中繼鏈路的狀態(tài)？（）

A. show interfaces interface
B. show interfaces trunk
C. show interfaces switchport
D. show ip interface brief
E. show interfaces vlan

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1.多項選擇題Which can be done to secure the virtual terminal interfaces on a router？（）

A.Administratively shut down the interfaces.
B.Physically secure the interfaces.
C.Configure a virtual terminal password and login process.
D.Enter an access list and apply it to the terminal interfaces using the access-class command.
E.Create an access list and apply it to the terminal interfaces using the access-group command

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2.多項選擇題Which two statements about using the CHAP authentication mechanism in a PPP link are true?（）

A.CHAP uses a two-way handshake
B.CHAP authentication periodically occurs after link establishment
C.CHAP has no protection from playback attacks
D.CHAP authentication is performed only upon link establishment
E.CHAP uses a three-way handshake
F.CHAP authentication passwords are sent in plaintext

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3.單項選擇題哪命令可以從PC被用來驗證同一局域網(wǎng)交換機連接的主機之間的連接？（）

A.ping address
B.tracert address
C.traceroute address
D.arp address

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4.多項選擇題端口是哪兩種狀態(tài)是時，RSTP收斂？（）

A.阻塞
B.學習
C.丟棄
D.轉(zhuǎn)發(fā)
E.偵聽

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5.多項選擇題在以太網(wǎng)網(wǎng)絡，在什么情況下可以兩種設備可以傳輸？（）

A.當他們收到一個特殊的記號
B.當有載波
C.當他們沒有檢測到其他設備發(fā)送
D.當介質(zhì)是空閑
E.當服務器授予訪問權限

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