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Is an ARP reply a broadcast?
Since ARP Request packets are always broadcast, and ARP Reply packets are not, receiving an ARP Request packet via broadcast is less surprising than receiving an ARP Reply packet via broadcast.
Is an ARP Reply broadcast or unicast Why?
ARP response is unicast because it knows the MAC Address and IP Address of the sender.
Why is an ARP request broadcast?
ARP Process This request must be a broadcast, because at this point the initiator does not know the target’s MAC address, and is therefore unable to send a unicast frame to the target. Since it was a broadcast, all nodes on the network will receive the ARP Request.
What do I need to know about Arp broadcast message?
ARP includes a protocol called ARP request, simply broadcast a message as follows: (if this is your IP address, please reply with your MAC address). ARP also includes a ARP Reply message, which include both the original IP address and the matching MAC address of the network device in question. Detailed ARP Request Process
How often does a host save an ARP reply?
Note that Hosts save the ARP replies in their ARP cache or ARP table for future use as they do with DNS queries. ARP is not used every time the host or the router needs to forward a packet to neighbor device.
What does ARP mean in terms of TCP / IP?
TCP/IP defines ARP as the method by which any host or router on a LAN can dynamically learn the MAC address of another host or router on the same LAN. ARP includes a protocol called ARP request, simply broadcast a message as follows: (if this is your IP address, please reply with your MAC address).
Is there a separate packet format for ARP request?
The ARP reply packet is received only by the host, which transmitted the ARP request packet. The ARP module adds the Ethernet hardware address to IP address mapping present in the ARP reply packet to the ARP cache. Is there a separate packet format for ARP request and ARP reply? No. Both the ARP request and ARP reply packets use the same format.