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发布时间: 2021-12-31 08:46
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Both bus and tree topologies are characterized by the use of multipoint( ). For the bus, all stations attach, through appropriate hardware( )known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the( ). A transmission from anystation propagates the length of the medium in both directions and can be received by all other( ). At each end of the bus is a( ), which absorbs any signal, removing it from the bus.
本题解析:
总线型和树型拓扑都使用多点传输介质。对于总线来说,所有的站都是通过称为接头的专用硬件直接连接到线性传输介质——总线上。站与接头之间的全双工操作使得既可以向总线上发送数据,又可以从总线上接收数据。任何站发送的数据都向总线两端传播,可以被所有站接收。在总线的两头各有一个终接器,它吸收并从总线上移去所有的信号。
Both bus and tree topologies are characterized by the use of multipoint( ). For the bus, all stations attach, through appropriate hardware( )known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the( ). A transmission from anystation propagates the length of the medium in both directions and can be received by all other( ). At each end of the bus is a( ), which absorbs any signal, removing it from the bus.
本题解析:
总线型和树型拓扑都使用多点传输介质。对于总线来说,所有的站都是通过称为接头的专用硬件直接连接到线性传输介质——总线上。站与接头之间的全双工操作使得既可以向总线上发送数据,又可以从总线上接收数据。任何站发送的数据都向总线两端传播,可以被所有站接收。在总线的两头各有一个终接器,它吸收并从总线上移去所有的信号。
Both bus and tree topologies are characterized by the use of multipoint( ). For the bus, all stations attach, through appropriate hardware( )known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the( ). A transmission from anystation propagates the length of the medium in both directions and can be received by all other( ). At each end of the bus is a( ), which absorbs any signal, removing it from the bus.
本题解析:
总线型和树型拓扑都使用多点传输介质。对于总线来说,所有的站都是通过称为接头的专用硬件直接连接到线性传输介质——总线上。站与接头之间的全双工操作使得既可以向总线上发送数据,又可以从总线上接收数据。任何站发送的数据都向总线两端传播,可以被所有站接收。在总线的两头各有一个终接器,它吸收并从总线上移去所有的信号。
Both bus and tree topologies are characterized by the use of multipoint( ). For the bus, all stations attach, through appropriate hardware( )known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the( ). A transmission from anystation propagates the length of the medium in both directions and can be received by all other( ). At each end of the bus is a( ), which absorbs any signal, removing it from the bus.
本题解析:
总线型和树型拓扑都使用多点传输介质。对于总线来说,所有的站都是通过称为接头的专用硬件直接连接到线性传输介质——总线上。站与接头之间的全双工操作使得既可以向总线上发送数据,又可以从总线上接收数据。任何站发送的数据都向总线两端传播,可以被所有站接收。在总线的两头各有一个终接器,它吸收并从总线上移去所有的信号。
Both bus and tree topologies are characterized by the use of multipoint( ). For the bus, all stations attach, through appropriate hardware( )known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the( ). A transmission from anystation propagates the length of the medium in both directions and can be received by all other( ). At each end of the bus is a( ), which absorbs any signal, removing it from the bus.
本题解析:
总线型和树型拓扑都使用多点传输介质。对于总线来说,所有的站都是通过称为接头的专用硬件直接连接到线性传输介质——总线上。站与接头之间的全双工操作使得既可以向总线上发送数据,又可以从总线上接收数据。任何站发送的数据都向总线两端传播,可以被所有站接收。在总线的两头各有一个终接器,它吸收并从总线上移去所有的信号。
交换机配置命令2950A (vlan)#vlan 3 name vlan3的作用是( )。
本题解析:
交换机配置命令2950A (vlan)#vlan 3 name vlan3的作用是创建编号为3的VLAN,并命名为vlan3,因此选A。
下列关于DHCP服务器的描述中,正确的是( )。
本题解析:
本题考查DHCP服务器。
DHCP服务器可以借助中继代理接受外网段内DHCP服务器提供的IP地址;需要保留的IP地址可以包含在DHCP服务器的地址池中,通过排除保留给特定用户;DHCP服务器可以帮助用户指定DNS服务器、默认网关、IP地址子网掩码等;DHCP服务器只能将一个IP地址同时分配给某个用户。因此选B。
下列DNS服务器中负责非本地域名查询的是( )。
本题解析:
本题考查DNS的几种服务器形式。
主域名服务器(primary name server) 负责维护这个区域的所有域名信息,是特定域所有信息的权威性信息源。当主域名服务器关闭、出现故障或负载过重时,辅域名服务器(secondary name server) 作为备份服务器提供域名解析服务。辅助服务器从主域名服务器获得授权,并定期向主服务器询问是否有新数据,如果有则调入并更新域名解析数据,以达到与主域名服务器同步的目的。缓存域名服务器(caching-only server)可运行域名服务器软件但是没有域名数据库。它从某个远程服务器取得每次域名服务器查询的回答,一旦取得一个答案,就将它放在高速缓存中,以后查询相同的信息时就用它予以回答。转发域名服务器(forwarding server)负责所有非本地域名的本地查询。转发域名服务器接到查询请求时,在其缓存中查找,如找不到就把请求依次转发到指定的域名服务器,直到查询到结果为止,否则返回无法映射的结果。
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