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» Linux » Examen sur Linux » Examen 202 : Networking Administration » Section 3 » Question 5/20

5.Several users complain that when checking their email or telnetting to your server they have to wait up to 60 seconds before getting their email or being presented with a login screen. However, immediately successive attempts at the same operation succeed normally – only to suffer again from the same problem after some time. What is causing this behavior?

The DNS server used by the clients is not properly resolving the server name to an ip address.
The routing table on the server contains multiple routes to the client’s machines.
The server is timing-out while trying to resolve the client’s IP addresses to names.
A router along the way is dropping packets in transit.
Another machine on the server’s network is using the same IP address.