Question 1
In the above diagram, three computers with IP address 192.168.1.2, 192.168.1.3 and 192.168.2.1 is connected to a layer 2 switch. Can the computer with IP address 192.168.1.2, ping the computer with IP address 192.168.2.1?
Explanation
The computer with IP address 192.168.1.2, belongs to the network address of 192.168.1.0. The computer with IP address 192.168.2.1 belongs to the network address of 192.168.2.0. Since both the computers belong to different network addresses, communication between them is possible only if a layer 3 device or a router is required. Computers require the mac-address of the peer for sending out the packet. ARP is used on an ethernet segment to find out the mac-address of the peer. ARP can be used to find out the mac-addresses of devices belonging to the same network address. If the destination is on a different network address, the ARP request is sent to the gateway. So in this case, there is no gateway configured.
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