You are the network administrator at Certkiller .com. One morning all users complain that they are unable to connect a Certkiller .com server. You reboot the server but the problem persists. You cannot ping any of the workstations by host name or IP address. You also cannot ping the servers loopback address. What is the most probable cause of this problem?
A. The DNS server is down. B. The DHCP server is down. C. The network switch is down. D. The NIC on the server has failed.
The nic on the server has failed.-when the network interface card (nic) on host fails, it will not be able to ping its loopback address.incorrect answers:a: dns is used to resolve fully qualified domain names (fqdns) to ip addresses.b: dhcp is responsible for automating the assignment of ip configurations to computer systems on a tcp/ip network. if dhcp was down, none of the workstations would be able to access the server but the server would be able to ping its loopback address.c: if the switch was down, we would not be able to access the server but the server would be able to ping its loopback address.references:david groth and toby skandier, network+ study guide (4th edition), sybex, alamedaca, 2005, pp. 117, 136-144, 184.