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單項(xiàng)選擇題What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch（）。

A.It creates a VLAN 999 interface.
B.It designates VLAN 999 for untagged traffic.
C.It blocks VLAN 999 traffic from passing on the trunk.
D.It designates VLAN 999 as the default for all unknown tagged traffic.

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1.多項(xiàng)選擇題下面哪些選項(xiàng)是物理層的基本功能？（）

A.在終端設(shè)備之間傳送比特流
B.建立、維護(hù)虛電路，進(jìn)行差錯(cuò)校驗(yàn)和流量控制
C.定義電壓、接口、線纜標(biāo)準(zhǔn)、傳輸距離等特性

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2.單項(xiàng)選擇題IP地址190.233.27.13/16所在的網(wǎng)段地址是（）。

A.190.0.0.0
B.190.233.0.0
C.190.233.27.0
D.190.233.27.1

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3.單項(xiàng)選擇題可路由協(xié)議的網(wǎng)絡(luò)地址由哪兩部分組成？（）

A.網(wǎng)絡(luò)地址和主機(jī)地址
B.主機(jī)地址和網(wǎng)絡(luò)掩碼
C.網(wǎng)絡(luò)地址和網(wǎng)絡(luò)掩碼

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4.單項(xiàng)選擇題RFC文檔是下面哪一個(gè)標(biāo)準(zhǔn)的工作文件？（）

A.ISO
B.ITU
C.IETF
D.IEEE

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5.多項(xiàng)選擇題What are three advantages of VLANs?（）

A.VLANs establish broadcast domains in switched networks.
B.VLANs utilize packet filtering to enhance network security.
C.VLANs provide a method of conserving IP addresses in large networks.
D.VLANs provide a low-latency internetworking alternative to routed networks.
E.VLANs allow access to network services based on department, not physical location.
F.VLANs can greatly simplify adding, moving, or changing hosts on the network.

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