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an arp (address resolution protocol) comes into picture when we have the ip address of our destination but we dont know the mac address of our destination.Normally when we open a web site this is the process which takes place.IP packet transmission comes after arp when the destination mac address is obtained after arp request.so an ip packet contains both source & destination IP & mac addr.
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What is gratuitous ARP?
Gratuitous in this case means a request/reply that is not normally needed according to the ARP specification (RFC 826) but could be used in some cases. A gratuitous ARP request is an AddressResolutionProtocol request packet where the source and destination IP are both set to the IP of the machine issuing the packet and the destination MAC is the broadcast address ff:ff:ff:ff:ff:ff. Ordinarily, no reply packet will occur. A gratuitous ARP reply is a reply to which no request has been made.
How is ARP reply message different from that of ARP request message?
An ARP request is a broadcast Ethernet packet, that is, a packet sent onto the local physical network that all attached devices will receive. A device sends an ARP request to make the query "what is the MAC address (a.k.a. hardware address, link layer address, etc.) of this IP address (a.k.a Layer 3 address, logical network address, etc.)?" An ARP reply is an unicast Ethernet packet, sent from the device that currently owns the specified IP address, back to the device which sent the ARP request. That is, no other device will receive this packet. The ARP reply answers the requester's question, saying "IP address x.x.x.x is associated with MAC address xx:xx:xx:xx:xx:xx".
What is an ARP request?
ARP is a protocol that maps MAC addresses to IP addresses for packet delivery and for finding out which device in a LAN has a given IP address.
What is the purpose of an arp request?
The purpose of an arp request is to map an IP address to a MAC address for the link layer to transmit a packet. For example, ARP will get a request to map 1.2.3.4 to a MAC address 12:fd:23:gf .Then ARP will cache the address mapping that next time an arp request doesnt need to happen
What is an arp request packet for?
ARP stands for Address Resolution Protocol. This is IP's way of requesting a MAC address (or hardware address) from a host located at a certain IP address. In order for a host on a network to send a unicast packet across the network, it must know both the source and destination MAC addresses. ARP is used to obtain a MAC address similar to the way DNS is used to obtain an IP address from a domain name (www.anydomain.com).
What is difference between ARP and RARP?
Address Resolution Protocol (ARP) provides a completely different function to the network than Reverse Address Resolution Protocol (RARP). ARP is used to resolve the Ethernet address of a NIC from an IP address in order to construct an Ethernet packet around an IP data packet. This must happen in order to send any data across the network. Reverse address resolution protocol (RARP) is used for disk less computers to determine their IP address using the network. If you want to more information so you can visit website :http://www.iyogibusiness.com
What method of transmission does a workstation use to send an ARP request?
A broadcast to all the nodes on its segment
What method of transmission does a workstation use to send out an ARP request?
A broadcast to all the nodes on its segment
Is the size of ARP packet fixed?
In theory, no, not necessarily, since ARP is flexible enough to be used to discover or describe a connection between other kinds of addresses, which don’t have to be the same lengths as IPv4 and Ethernet addresses.
What happen to the packet when it is received by data link layer?
here in data link the actual physical mean of coneection will takes place between source and destination hosts......once packet from network layer enter into data link layer the trailer is gonna add to packet also the MAC(media access control) address of destination host will be determined............once source host get the information of MAC.......its gonna add to packet along with packet then it will be called by name frame....switch will work in this layer and the protocol used are ARP and RARP........
What method of transmission does a workstation use to send a arp request?
Point-to-point to the node with the corresponding IP address
To make arp more efficient computers save recognized mac to ip address mappings on their hard disks in a database known as?
To make ARP more efficient computers save recognized mac to IP address mappings on their hard disks in a database known as ARP cache. ARP is an network layer protocol / third layer protocol. ARP provides mapping between Logical to physical address.
