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某系统的可靠性结构框图如下图所示。该系统由4个部件组成，其中2、3两个部件并联冗余，再与1、4部件串联构成。假设部件1、2、3的可靠度分别为0.90、0.70、0.70。若要求该系统的可靠度不低于0.75，则进行系统设计时，分配给部件4的可靠度至少应为（）。

某系统的进程状态转换如下图所示，图中1、2、3、4分别表示引起状态转换的不同原因，原因4表示（）。

某网络工程计划图如下所示，边上的标记为任务编码及其需要的完成时间（天），则整个工程的工期为（）

目前在网络上流行的“熊猫烧香”病毒属于（）类型的病毒。

在SNMPv2中，一个实体发送一个报文，一般经过四个步骤：
①加入版本号和团体名，构造报文；
②把PDU、源和目标端口地址以及团体名传送给认证服务，认证服务产生认证码或对数据进行加密，返回结果；
③根据要实现的协议操作构造PDU；
④进行BER编码，产生0/1比特串。这四个步骤的正确次序是（）

在E1载波中，每个子信道的数据速率是（），E1载波的控制开销占（）。

在E1载波中，每个子信道的数据速率是（），E1载波的控制开销占（）。

FTP使用的传输层协议为（），FTP的默认的控制端口号为（）。

POP3协议采用（）模式，当客户机需要服务时，客户端软件（Outlook Express或Foxmail）与POP3服务器建立（）连接。

局域网中某主机的IP地址为172.16.1.12/20，该局域网的子网掩码为（），最多可以连接的主机数为（）。

下图为某系统集成项目的网络工程计划图，从图可知项目最短工期为（）天，至少需要投入（）人才能完成该项目（假设每个技术人员均能胜任每项工作）。

Serialization delay and（）delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the（）on the wire, and queuing delay (depth of the queue) are improved by increasing the（）from a 128kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （）in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the（）of the application will only result in an increased bandwidth with no positive effects on performance.

POP3协议采用（）模式，当客户机需要服务时，客户端软件（Outlook Express或Foxmail）与POP3服务器建立（）连接。

下图为某系统集成项目的网络工程计划图，从图可知项目最短工期为（）天，至少需要投入（）人才能完成该项目（假设每个技术人员均能胜任每项工作）。

局域网中某主机的IP地址为172.16.1.12/20，该局域网的子网掩码为（），最多可以连接的主机数为（）。

FTP使用的传输层协议为（），FTP的默认的控制端口号为（）。

Serialization delay and（）delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the（）on the wire, and queuing delay (depth of the queue) are improved by increasing the（）from a 128kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （）in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the（）of the application will only result in an increased bandwidth with no positive effects on performance.

Serialization delay and（）delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the（）on the wire, and queuing delay (depth of the queue) are improved by increasing the（）from a 128kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （）in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the（）of the application will only result in an increased bandwidth with no positive effects on performance.

Serialization delay and（）delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the（）on the wire, and queuing delay (depth of the queue) are improved by increasing the（）from a 128kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （）in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the（）of the application will only result in an increased bandwidth with no positive effects on performance.

Serialization delay and（）delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the（）on the wire, and queuing delay (depth of the queue) are improved by increasing the（）from a 128kbps circuit to a T1. However, three other components of delay, routing/switching delay, distance delay, and protocol delay are components that can not be positively affected by an （）in bandwidth. If the circuits are not over-utilized, then increasing the bandwidth to improve the（）of the application will only result in an increased bandwidth with no positive effects on performance.