在Windows中，执行（ ）命令可以查看域名信息。
Nslookup是一种网络管理命令行工具，可在多种操作系统中使用，通过查询DNS以获得域名或IP地址的映射或其他DNS记录，此外还可以用于DNS故障排错。
Netstat可以显示协议统计信息和当前的TCP/IP网络连接，其中较为常用的是用来查看端口状态。语法格式为：“netstat /参数”。
Arp命令用于显示和修改ARP使用的“IP到MAC地址映射”缓存表内容。语法格式为：“arp /参数”。arp -a显示arp缓存表。
nbtstat用于提供关于NETBIOS的统计数据。运用NETBIOS，你可以查看本地计算机或远程计算机上的NETBIOS名字表格。
ICMP is short for Internet（ ）Message Protocol, and is an integral part of the Internet（ ）suite (commonly referred to as TCP/IP). It is a（ ）layer protocol used by network devices to diagnose network communication issues. IP is not designed to be absolutely reliable. ICMP is to provide feedback about problems in the communication environment, not to make IP（ ）.One of the most well-known and useful messages in an ICMP datagram is the Destination（ ）message which is generated for several reasons, including unable to reach a network, a host, aport, or a protocol.
ICMP is short for Internet（ ）Message Protocol, and is an integral part of the Internet（ ）suite (commonly referred to as TCP/IP). It is a（ ）layer protocol used by network devices to diagnose network communication issues. IP is not designed to be absolutely reliable. ICMP is to provide feedback about problems in the communication environment, not to make IP（ ）.One of the most well-known and useful messages in an ICMP datagram is the Destination（ ）message which is generated for several reasons, including unable to reach a network, a host, aport, or a protocol.
ICMP is short for Internet（ ）Message Protocol, and is an integral part of the Internet（ ）suite (commonly referred to as TCP/IP). It is a（ ）layer protocol used by network devices to diagnose network communication issues. IP is not designed to be absolutely reliable. ICMP is to provide feedback about problems in the communication environment, not to make IP（ ）.One of the most well-known and useful messages in an ICMP datagram is the Destination（ ）message which is generated for several reasons, including unable to reach a network, a host, aport, or a protocol.
ICMP is short for Internet（ ）Message Protocol, and is an integral part of the Internet（ ）suite (commonly referred to as TCP/IP). It is a（ ）layer protocol used by network devices to diagnose network communication issues. IP is not designed to be absolutely reliable. ICMP is to provide feedback about problems in the communication environment, not to make IP（ ）.One of the most well-known and useful messages in an ICMP datagram is the Destination（ ）message which is generated for several reasons, including unable to reach a network, a host, aport, or a protocol.
ICMP is short for Internet（ ）Message Protocol, and is an integral part of the Internet（ ）suite (commonly referred to as TCP/IP). It is a（ ）layer protocol used by network devices to diagnose network communication issues. IP is not designed to be absolutely reliable. ICMP is to provide feedback about problems in the communication environment, not to make IP（ ）.One of the most well-known and useful messages in an ICMP datagram is the Destination（ ）message which is generated for several reasons, including unable to reach a network, a host, aport, or a protocol.
电子邮件系统中，发送邮件协议为SMTP协议，使用的端口号是（ ）。
可以通过电子邮件发送的文件类型有（ ）。
①视频文件②音频文件③图片文件④文本文件
下列关于ping命令的描述中，说法错误的是（ ）。
在Windows中，执行（ ）命令可以查看域名信息。
在Windows中，要查看到目标主机Alice的路径，可使用（ ）命令。
