You are told that a networked computer has no connection to the outside world, despite the fact that other computers in the LAN have Internet access. The computer can access other resources inside the LAN. The most likely cause is: Another PC has the same IP address The NIC has malfunctioned Another PC has the same MAC address The default gateway on this particular device has been incorrectly configured A network engineer cannot ping other machines inside a LAN and suspects the problem may be the NIC. The best way to diagnose such a problem is to: Ping 127.0.0.1 Enable interface Reboot the IOS Run traceroute Ethernet is found in the X layer whereas IP is found in the Y layer. X and Y respectively refer to: Application, Network Transport, Network Data Link, Network Physical, Transport The number of hosts allowed by the subnet mask 255.255.255.128 is: 126 254 128 62 62 One of the functions of the network layer is to: Provide end to end delivery to the corresponding application Transfer fixed length data from a source to a destination host Moves data in and out of the physical network Transfer variable length data from a source to a destination host