PC1 200.200.200.1 pinged PC2 200.200.200.3 as shown in the packet listing below.
ID: 3883620 • Letter: P
Question
PC1 200.200.200.1 pinged PC2 200.200.200.3 as shown in the packet listing below. If PC1 pings PC2 immediately again, How would the network traffic differ from the first ping? And Why? No. Time Source Destination Src Port Dest Port Protocol Length Info 1 0.000000 00: 50: 04: 98: bl: 09 ff: ff: ff: ff: ff: ff ARP 64 Who has 200.200.200.3? Tell 200.200.200.1 2 0.000000 00: 50: da: 12: 15: 9b 00: 50: 04: 98: bl: 09 ARP 64 200.200.200.3 is at 00: 50: da: 12: 15: 9b 3 0.001000 200.200.200.1 200.200.200.3 ICMP 78 Echo (ping) request id = 0x0100, seq=256/l, ttl = 32 (reply in 4) 4 0.001000 200.200.200.3 200.200.200.1 ICMP 78 Echo (ping) reply id = 0x0100, seq = 256/1, ttl = 128 (request in 3) 5 1.002000 200.200.200.1 200.200.200.3 ICMP 78 Echo (ping) request id = 0x0100, seq = 512/2, ttl = 32 (reply in 6) 6 1.002000 200.200.200.3 200.200.200.1 ICMP 78 Echo (ping) reply id = 0x0100, seq=512/2, ttl = 128 (request in 5) 7 2.002000 200.200.200.1 200.200.200.3 ICMP 78 Echo (ping) request id = 0x0100, seq = 768/3, ttl = 32 (reply in 8) 8 2.003000 200.200.200.3 200.200.200.1 ICMP 78 Echo (ping) reply id = 0x0100, seq = 768/3, ttl =128 (request in 7) 10 3.007000 200.200.200.1 200.200.200.3 ICMP 78 Echo (ping) request id = 0x0100, seq = 1024/4, ttl = 32 (reply in 11) 11 3.007000 200.200.200.3 200.200.200.1 ICMP 78 Echo (ping) reply id = 0x0100, seq = 1024/4, ttl = 128 (request in 10)Explanation / Answer
ARP stands for Address Resolution Protocol. This protocol helps a node to resolve the physical address of the other system to which a particular ip address is allocated. When a node tries to ping or connect to any other system for the first time in that case it first broadcasts a ARP request to resolve the physical address of the system with that particular ip address. After that it can directly communicate with that particular node.
Same goes the situation here also. First of all a ARP request is generated to broadcast address ff:ff:ff:ff:ff:ff to get the physical address of the system with ip address 200.200.200.1. After getting the physical address the system starts the communication process by sending the ICMP echo request and echo reply messages.
After this when the PC1 immediately pings the PC2 in that case it will not make a request for the ARP as it already has the physical address of that particular system and can further start communicating with the node.
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