单选题Click the Exhibit button. From a local machine， connectivity with a server named server1.comptia.org is checked. It cannot be reached， but it can be accessed via the IP address. Which of the following is the MOST common cause of this error？（）AThe s
题目
单选题
Click the Exhibit button. From a local machine， connectivity with a server named server1.comptia.org is checked. It cannot be reached， but it can be accessed via the IP address. Which of the following is the MOST common cause of this error？（）
A
The server is down.
B
The DNS server is down.
C
The local DNS cache is full.
D
The local DNS client is stopped.
E
The local DNS cache is corrupted.