路由器的访问控制列表（ACL）的作用是 （ ）

快速以太网标准100Base-TX规定的传输介质是

2023-09-01 从业资格其它

设信道带宽为5000Hz，采用PCM编码，采样周期为125μs，每个样本量化为256个等级，则信道的数据速率为（ ）。

2023-09-01 从业资格其它

CHAP协议是PPP链路中采用的一种身份认证协议，这种协议采用三次握手方式周期性的验证通信对方的身份，当认证服务器发出一个挑战报文时，则终端就计算该报文的（ ）并把结果返回服务器。

2023-09-01 从业资格其它

数据链路协议HDLC是一种（ ）。

2023-09-01 从业资格其它

E1载波的控制开销占（ ），E1基本帧的传送时间为（19）

2023-09-01 从业资格其它

E1载波的控制开销占（18），E1基本帧的传送时间为（ ）

2023-09-01 从业资格其它

In low-speed network,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down.In high-speed networks,this approach often works poorly,because in the（71）between sending the notification and notification arriving at the source,thousands of additional（72）may arrive.In ATM network,a major tool for preventing（73）is（74）control.When a host wants a new virtual（75）,it must describe the traffic to be offered and the service expected.

2023-09-01 从业资格其它

In low-speed network,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down.In high-speed networks,this approach often works poorly,because in the（71）between sending the notification and notification arriving at the source,thousands of additional（72）may arrive.In ATM network,a major tool for preventing（73）is（74）control.When a host wants a new virtual（75）,it must describe the traffic to be offered and the service expected.

2023-09-01 从业资格其它

（ ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.

2023-09-01 从业资格其它

In low-speed network,it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down.In high-speed networks,this approach often works poorly,because in the（71）between sending the notification and notification arriving at the source,thousands of additional（72）may arrive.In ATM network,a major tool for preventing（73）is（74）control.When a host wants a new virtual（75）,it must describe the traffic to be offered and the service expected.

2023-09-01 从业资格其它