單項選擇題VLAN 3 is not yet configured on your switch. What happens if you set the switchport access vlan3 commmand interface configuration mode？（）

A.The command is accepted and the respective VLAN is added to vlan dat.
B.The command is rejected.
C.The command is accepted and you must configure the VLAN manually.
D.The port turns amber.


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2.單項選擇題What occurs on a Frame Relay network when the CIR is exceeded?（）

A.All TCP traffic is marked discard eligible
B.All UDP traffic is marked discard eligible and a BECN is sent
C.All TCP traffic is marked discard eligible and a BECN is sent
D.All traffic exceeding the CIR is marked discard eligible

3.單項選擇題下面屬于物理層的設備是（）。

A.網橋
B.網關
C.中繼器
D.以太網交換機

4.單項選擇題應用程序PING發(fā)出的是（）報文。

A.TCP請求
B.TCP應答報文
C.ICMP Echo請求報文
D.ICMP Echo應答報文

5.多項選擇題下面選項中哪些是數據鏈路層的主要功能？（）

A.提供對物理層的控制
B.差錯控制
C.流量控制
D.決定傳輸報文的最佳路由