Question 235 of 610 from exam N10-007: CompTIA Network+

Question 235 of 610 from exam N10-007: CompTIA Network+

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Question

A system administrator receives reports from users of odd behavior in regard to a recently installed server.

While reviewing the server network configuration, the systems administrator does both a forward and a reverse DNS lookup on the host, along with the network adapter configuration.

$ host server.company.com server.company.com has address 129.168.0.100 server.company.com is handled by 100 mail. company.com $ host 192.168.0.100 100.0.168.192.in-addr.arpa domain name pointr web.company.com $ host web.company.com server.company.com has address 129.168.0.50 server.company.com is handled by 100 mail. company.com $ ifconfig -a ethOLink encap:Ethernet HWaddr 00:30:48:9D:06:73 Inet addr:192.168.0.100 Beast: 192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 1o0Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU: 16436 Metric:1

Which of the following is the problem identified in the output above?

A.

There is no reverse DNS entry for this host. B.

The server IP address is incorrectly configured. C.

The DNS lookup entry is incorrectly configured. D.

The reverse DNS entry is pointing to a different host.

C.

Explanations

A system administrator receives reports from users of odd behavior in regard to a recently installed server.

While reviewing the server network configuration, the systems administrator does both a forward and a reverse DNS lookup on the host, along with the network adapter configuration.

$ host server.company.com server.company.com has address 129.168.0.100 server.company.com is handled by 100 mail. company.com $ host 192.168.0.100 100.0.168.192.in-addr.arpa domain name pointr web.company.com $ host web.company.com server.company.com has address 129.168.0.50 server.company.com is handled by 100 mail. company.com $ ifconfig -a ethOLink encap:Ethernet HWaddr 00:30:48:9D:06:73 Inet addr:192.168.0.100 Beast: 192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 1o0Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU: 16436 Metric:1

Which of the following is the problem identified in the output above?

A.

There is no reverse DNS entry for this host.

B.

The server IP address is incorrectly configured.

C.

The DNS lookup entry is incorrectly configured.

D.

The reverse DNS entry is pointing to a different host.

C.

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