多协议标记交换(MPLS)是IETF提出的第三层交换标准弦以下关于MPLS的叙述中,正确的是 ()。
A.带有MPLS标记的分组封装在PPP帧中传输
B.传送带有MPLS标记的分组之前先要建立对应的网络连接
C.路由器根据转发目标把多个IP流聚合在一起组成转发等价类
D.MPLS标记在各个子网中是特定分组的唯一标识
通过HFC网络实现宽带接入,用户端需要的设备是(1),局端用于控制和管理用户的设备是(2) 。
(1)A.Cable Modem
B.ADSL Modem
C.OLT
D.CMTS
(2)A. Cable Modem
B.ADSL Modem
C.OLT
D.CMTS
在层次化局域网模型中,以下关于核心层的叙述,正确的是() 。
A.为了保障安全性,对分组要进行有效性检查
B.将分组从一个区域高速地转发到另一个区域
C.由多台二、三层交换机组成
D.提供多条路径来缓解通信瓶颈
通过HFC网络实现宽带接入,用户端需要的设备是(1),局端用于控制和管理用户的设备是(2)
(1)A. Cable Modem
B. ADSL Modem
C. OLT
D. CMTS
(2)A. Cable Modem
B. ADSL Modem
C. OLT
D. CMTS
在层次化局域网模型中,以下关于核心层的叙述中,正确的是()
A.为了保障安全性,对分组要进行有效性检查
B.将分组从一个区域高速地转发到另一个区域
C.由多台二、三层交换机组成
D.提供多条路径来缓解通信瓶颈
The Dynamic Host Configuration Protocol provides configuration parameters to Internet(1). DHCP consists of two components: a(2) for delivering host-specific configuration parameters from a DHCP server to a host and a mechanism for allocation of network addresses to hosts. DHCP is built on a client-server model, where designated DHCP server hosts allocate network addresses and deliver (3) parameters to dynamically configured hosts. DHCP supports three mechanisms for IP address allocation. In"automatic allocation",DHCP assigns a(4) IP address to a client. In"dynamic allocation",DHCP assigns an IP address to a client for a limited period of time. In"manual allocation", a client's IP address is assigned by the network (5), and DHCP is used simply to convey the assigned address to the client
(1)A. switch
B. terminal
C. hosts
D. users
(2)A. router
B. protocol
C. host
D. mechanism
(3)A. control
B. broadcast
C. configuration
D. transmission
(4)A. permanent
B. dynamic
C. connection
D.session
(5)A.controller
B.user
C. host
D. administrator