关于是用LR测试DNS

mr.bee

今天看用户手册的时候看到DNS测试

试了一下，填入了公司DNS和baidu.com
返回如下

Virtual User Script started
Starting action vuser_init.
Ending action vuser_init.
Running Vuser...
Starting iteration 1.
Starting action Action.
Action.c(25): Querying host information for 'www.baidu.com' from 10.10.5.1...
Action.c(25): Notify: Transaction "DnsQuery" started.
Action.c(25): Host www.a.shifen.com resolved to 121.14.88.14 (w/ TTL=454 secs).
Action.c(25): Host www.a.shifen.com resolved to 121.14.89.14 (w/ TTL=454 secs).
Action.c(25): Notify: Transaction "DnsQuery" ended with "Pass" status (Duration: 0.0087).
(1) IP address for www.baidu.com is 121.14.88.14
(2) IP address for www.baidu.com is 121.14.89.14
Ending action Action.
Ending iteration 1.
Ending Vuser...
Starting action vuser_end.
Ending action vuser_end.
Vuser Terminated.

有几个问题：
1.“www.a.shifen.com”是什么来的？
2.“w/ TTL=454 secs”表示什么？
3.“Duration”表示的是什么？
4.
(1) IP address for www.baidu.com is 121.14.88.14
(2) IP address for www.baidu.com is 121.14.89.14

表示的是什么？

mr.bee

从来没有人做过吗？

tiancaim

不懂