【单选题】The well-known ping program sends an (a) ____ type 8 code 0 message to the specified host. The destination hosts seeing the echo request, send back a type 0 code 0 ICMP echo reply.
【简答题】Good writing starts with good ideas. If you write about things that you care about, you will write better. If you write about things that you don’t care about, you’ll be bored and your paper will not ...