下列关于ping命令的描述中，说法错误的是（ ）。
ping一般作为测试连通性使用。ping命令后，会接收到对方发送的回馈信息，其中记录着对方的IP地址和TTL。
语法格式为：“ping /参数IP地址或域名”，具体如图7-2所示。
以下是常见的参数及其解释说明：
1. /?：显示帮助信息。
2. /t：持续ping一个IP地址，可以使用Ctrl+C停止持续ping。
3. /l：设置请求报文的字节数长度，默认是32字节。
4. /a：如果用IP地址表示目标，会尝试将IP地址解析为主机名并显示。
5. /n：设置发送请求报文的次数，默认是4次。
选项C对应的是将ping包大小设置为1000字节。
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。
