双绞线电缆中的4对线用不同的颜色来标识，EIA/TIA 568A规定的线序为（），而EIA/TIA T568B规定的线序为（）。

而EIA/TIA T568B规定的线序为（）

A:橙白；橙；绿白；蓝；蓝白；绿；褐白；褐 B:蓝白；蓝；绿白；绿；橙白；橙；褐白；褐 C:绿白；绿；橙白；蓝；蓝白；橙；褐白；褐 D:绿白；绿；橙白；橙；蓝白；蓝；褐白；褐

有4个网络地址：192.47.16.254、192.47.17.01、192.47.32.25和192.47.33.05，如果子网掩码为255.255.240.0，则这4个地址分别属于（）个子网。下面列出的地址对中，属于同一个子网的是（）。 

则这4个地址分别属于（）个子网。

A:1 B:2 C:3 D:4

有4个网络地址：192.47.16.254、192.47.17.01、192.47.32.25和192.47.33.05，如果子网掩码为255.255.240.0，则这4个地址分别属于（）个子网。下面列出的地址对中，属于同一个子网的是（）。 

下面列出的地址对中，属于同一个子网的是（）

A:192.47.16.254和192.47.32.25 B:192.47.16.254和192.47.17.01 C:192.47.17.01和192.47.33.05 D:192.47.17.01和192.47.32.25

某公司网络地址是206.110.64.0/18，被划分成16个子网，则每个子网的子网掩码为（），最大可容纳的主机数是（）。

每个子网的子网掩码为（）

A:255.255.255.0 B:255.255.254.0 C:255.255.252.0 D:255.255.240.0

某公司网络地址是206.110.64.0/18，被划分成16个子网，则每个子网的子网掩码为（），最大可容纳的主机数是（）。

最大可容纳的主机数是（）

A:254 B:512 C:1022 D:1024

SNMP代理使用（）操作向管理端通报重要事件的发生。在下图中，（）能够响应Manager2的getRequest请求。  SNMP代理使用（）操作向管理端通报重要事件的发生。

A:GetRequest B:Get-nextRequest C:SetRequest D:Trap

SNMP代理使用（）操作向管理端通报重要事件的发生。在下图中，（）能够响应Manager2的getRequest请求。  在下图中，（）能够响应Manager2的getRequest请求。

A:Agent1 B:Agent2 C:Agent3 D:Agent4

A multicast router may receive thousands of multicast （） every day for different groups. If a router has no knowledge about the membership status of the （） , it must broadcast all of these packets. This creates a lot of traffic and consumes （）. A better solution is to keep a list of groups in the network for which there is at least one loyal member. （） helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the （） packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

A multicast router may receive thousands of multicast （） every day for different groups.

A:packets B:errors C:reports D:alarms

A multicast router may receive thousands of multicast （） every day for different groups. If a router has no knowledge about the membership status of the （） , it must broadcast all of these packets. This creates a lot of traffic and consumes （）. A better solution is to keep a list of groups in the network for which there is at least one loyal member. （） helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the （） packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

If a router has no knowledge about the membership status of the （）, it must broadcast all of these packets.

A:routers B:network C:packets D:hosts

A multicast router may receive thousands of multicast （） every day for different groups. If a router has no knowledge about the membership status of the （） , it must broadcast all of these packets. This creates a lot of traffic and consumes （）. A better solution is to keep a list of groups in the network for which there is at least one loyal member. （） helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the （） packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

This creates a lot of traffic and consumes （）.

A:capability B:power C:bandwidth D:address