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What command allows you to view entries in the ARP table of a Cisco router?
show ip arp
What end-system command would you use to delete a specific entry from an ARP table?
arp -d ip-address
What arp table entries are created when a client makes an arp request that cannot be satisfied by data already in the arp?
Dynamic ARP table entries are created whne a client makes an ARP request that cannot be satisfied by data already in the ARP table.
What mechanism does ARP use to resolve IP addresses?
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.
Are created when a client makes an ARP request that cannot be satisfied by data already in the ARP table?
Dynamic ARP table entries
What commands do you use to verify the ARP cache on a windows end-system and the ARP table ina Cisco router?
arp -a show arp
Explain the ARP utility is used for?
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 what the arp utility is used for?
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
What does the dynamic ARP table describe?
The dynamic ARP table tells you all the ARP (Address Resolution Protocol) that have been dynamically learned rather than statically. Dynamically means that it learned the pathway automatically without having to be configured.
What is the default amount of time that an entry remains in your ARP cache before being removed?
The default time to keep the ARP table entry is 20 mins...For every 20mins the ARP table will be refreshed. Because, The neighboring device can be out of the network so the ARP table should be updated according to the network states. When the table gets refreshed the content will get erased and when the chance comes to resolve the MAC address to the known IP address the ARP request will be sent in broadcast mode where the reply will be in Unicast mode.
What does arp -s do in command prompt?
it allows you to create a permanent entry in your cache
What can contain two types of entries dynamic and static?
An ARP table.
