What common target can be reconfigured to disable an interface and provide inaccurate IP addresses over the Internet?

A.
Routers

B.
E-mail servers

C.
DNS servers

D.
Databases

Explanation:
Routers are attacked, because they may have weak security. If the router uses SNMP, which passes the community name in cleartext, attacking the router is an easy target. One into the router, either via SNMP or using Telnet, interfaces can be disabled, or reconfigured with a new address.
Incorrect Answers:
B: E-mail servers do not have an interface that can be disabled, nor would it be easy to target the e-mail server to change the IP address.
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C: DNS servers do not have an interface that can be disabled, no would it be easy to target the DNS server to change the IP address. It is possible to hack a secondary DNS server and fake a zone transfer into it, thus changing the addresses that the DNS server provides. But the server does not provide a means that a hacker can get into configuration and disable any interfaces.
D: Databases do not have interfaces (although database servers do), nor are there IP addresses in the databases that could be used to allow inaccurate distribution of data.