TCP/IP Address Resolution Protocol Utility (arp)
(Page 2 of 2) arp Utility Functions To allow administrators to manage this ARP cache table, TCP/IP devices include an arp utility. It has three basic functions, which are invoked using three different versions of the command (which, for once, are the same in UNIX and Windows!): * ARP Cache Table Display ("arp -a"): When the "-a" option is used with the utility, it displays the current contents of the ARP cache table. Each entry in the table shows the IP address and hardware address pair for one device (interface, actually); usually an indication is also given as to whether each entry is static or dynamic
The exact format of the display varies from one implementation to the next; some programs show IP addresses while others show host names, and still others may show both. Some systems default to displaying host names but allow the "-n" option to also be used to force only IP addresses to be displayed and not names. * ARP Cache Table Entry Addition ("arp -s
ARP is a Third layer or Network layer protocol. ARP is an address resolution protocol . The mechanism used by ARP to resolve IP address is look up table.
Dynamic ARP table entries are created whne a client makes an ARP request that cannot be satisfied by data already in the ARP table.
Reverse ARP is used to Obtain IP address from a Server(responsible for IP addresses allocation) by providing its layer 2 (MAC) address.
ARP = Air Raid Precautions.
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
is used by ip to ascertain the MAC address of a device on the same subnet as the request.
TCP/IP Address Resolution Protocol Utility (arp)(Page 2 of 2) arp Utility Functions To allow administrators to manage this ARP cache table, TCP/IP devices include an arp utility. It has three basic functions, which are invoked using three different versions of the command (which, for once, are the same in UNIX and Windows!): * ARP Cache Table Display ("arp -a"): When the "-a" option is used with the utility, it displays the current contents of the ARP cache table. Each entry in the table shows the IP address and hardware address pair for one device (interface, actually); usually an indication is also given as to whether each entry is static or dynamicThe exact format of the display varies from one implementation to the next; some programs show IP addresses while others show host names, and still others may show both. Some systems default to displaying host names but allow the "-n" option to also be used to force only IP addresses to be displayed and not names. * ARP Cache Table Entry Addition ("arp -s "): This syntax allows an administrator to make a new manual ARP cache table entry that maps the given host name to the specified hardware address. * ARP Cache Table Entry Deletion ("arp -d "): This command removes the specified cache entry from the table. Some implementations allow the addition of another parameter to specify that all entries should be removed from the cache. Additional arp Features Certain versions of the software may also supplement these basic commands with additional features. One common additional option on UNIX systems is the ability to specify a file from which cache table entries may be read, using "arp -f ". This saves a considerable amount of time and effort compared to typing each entry manually using "arp -s". Note also that access to options that cause the ARP cache table to be changed may be restricted by the operating system to only authorized users. This is especially true of the delete function, and especially especially true of the function that allows the entire ARP table to be deleted. J
explain the difference between total utility and marginal utility
explain the demerits of diminishing marginal utility
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ARP is a Third layer or Network layer protocol. ARP is an address resolution protocol . The mechanism used by ARP to resolve IP address is look up table.
Address Resolution Protocol (ARP)ARP is primarily used to translate IP Addresses to Ethernet MAC Addresses.
ARP is not used for internetwork communications, it will send ARP to find gateway to be able to communicate with another network.
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Dynamic ARP table entries are created whne a client makes an ARP request that cannot be satisfied by data already in the ARP table.