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18 Cards in this Set
- Front
- Back
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What does the process Gratuitous ARP do?
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In the last stage of DHCP when the client has received an IP address, it sends out an ARP Request for that IP to make sure that it isn't already in use by another client.
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To set an IOS device to be a DHCP client
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router(config-if)# ip address [dhcp]
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To enable the DHCP server service (on by default)
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router(config)# service dhcp
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To create a pool of Ip addresses to assign to clients
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router(config)# ip dhcp pool [name]
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To assign a network to the pool
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router(config-dhcp)# network [address] [/mask]
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To tell the client how long it can keep the address (lease period). Most implementations use 3 days, but Cisco IOS default is 1 day.
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router(config-dhcp)# lease [days]
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To define the address of the DNS Server for the client
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router(config-dhcp)# dns-server [ip address]
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To define the domain name for the client
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router(config-dhcp)# domain-name [name]
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To identify the default gateway
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router(config-dhcp)# default-router [ip add]
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To enable DHCP to import the options and parameters from 1 interface and pass them to the other interface. This allows a IOS device to receive an IP on 1 interface and assign to another.
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router(config-dhcp)# import all
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To list addresses that should be excluded from the DHCP pool
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router(config-dhcp)# ip dhcp excluded-address [start IP] [end IP]
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To forward broadcasts of select UDP ports to predetermined remote locations. In the case of DHCP relays, they forward requests and set the gateway to the local router.
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router(config-if)# ip helper-address [Ip add]
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To add additional ports to the ip helper-address. The 8 added by default are NTP (udp37), TACACS (UDP49, DNS (udp53), DHCP (udp67&68), TFTP (udp69), netBIOS name service (udp137) and NetBIOS datagram service (udp138)
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router(config)# ip forward-protocol upd [port num]
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To examine the DHCP database
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router# show ip dhcp database
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To view more detailed info about the DHCP configuration
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router# show ip dhcp server statistics
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To display IP address bindings on the DHCP server or for a specific client with the stated IP address
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router# show ip dhcp bindings [ip add]
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To delete all automatic address binding or a specified one from the DHCP server database.
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router# clear ip dhcp bindings [ip add | *]
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To enable DHCP server debugging
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router# debug ip dhcp server events or debug ip dhcp server packets
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