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What can contain two types of entries dynamic and static?
An ARP table.
What is one layer of security that can be applied to ARP cache entries that could aid countering ARP spoofing?
static gateway address
How long do ARP entries remain in the ARP cache by default?
The default amount of time for ARP entries to stay in the ARP cache is 10 minutes for referenced entries and 2 minutes for entries that are not referenced.
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 can be done to prevent ARP spoofing?
static arp
What command allows you to view entries in the ARP table of a Cisco router?
show ip arp
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 happens to the ARP cache when a Cisco router is powered off?
Unless there are static ARP mappings, the cache will be cleared when powered off.
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
How is static pressure removed?
By grounding.
Static and dynamic routing table?
A routing table can be either static or dynamic. A static table is one with manual entries. A dynamic table, on the other hand, is one that is updated automatically when there is a change somewhere in the internet.
