多項選擇題Which of the following are benefits of VLANs? （）

A.They increase the size of collision domains.
B.They allow logical grouping of users by function.
C.They can enhance network security.
D.They increase the size of broadcast domains while decreasing the number of collision domains.
E.They increase the number of broadcast domains while decreasing the size of the broadcast domains.
F.They simplify switch administration.


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1.多項選擇題下列哪些技術(shù)有助于減少路由環(huán)路？（）

A.直接交換
B.采用鏈路狀態(tài)路由協(xié)議
C.水平分割
D.保持間隔
E.定義最大跳數(shù)
F.路由中毒

2.單項選擇題10.1.0.1/17的廣播地址是（）。

A.10.1.128.255
B.10.1.63.255
C.10.1.127.255
D.10.1.126.255

3.多項選擇題Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? （）

A.15.234.118.63
B.92.11.178.93
C.134.178.18.56
D.192.168.16.87
E.201.45.116.159
F.217.63.12.192

5.多項選擇題Which of the following describe the process identifier that is used to run OSPF on a router (Choose two.)（）。

A.It is locally significant
B.It is globally significant
C.It is needed to identify a unique instance of an OSPF database
D.It is an optional parameter required only if multiple OSPF processes are running on the router
E.All routers in the same OSPF area must have the same process ID if they are to exchange routing information

6.多項選擇題Which of the following host addresses are members of networks that can be routed across the public Internet? （）

A.10.172.13.65
B.172.16.223.125
C.172.64.12.29
D.192.168.23.252
E.198.234.12.95
F.212.193.48.254

8.多項選擇題An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location? （）

A.The switch must be configured with an IP address, subnet mask, and default gateway.
B.The switch must be connected to a router over a VLAN trunk.
C.The switch must be reachable through a port connected to its management VLAN.
D.The switch console port must be connected to the Ethernet LAN.
E.The switch management VLAN must be created and have a membership of at least one switch

9.單項選擇題TCP、UDP、SPX屬于OSI的（）。

A.網(wǎng)絡(luò)層
B.傳輸層
C.會話層
D.表示層

10.單項選擇題What is the effect of using the service password-encryption command？（）

A.Onl ypasswords configured afte rthe command has been entered will be encrypted.
B.Only the enable password will be encrypted.
C.Only the enable secret password will be encrypted
D.It will encrypt the secret password and remove the enable secret password from the configuration.
E.It will encrypt all current and future passwords.

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