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cisco 200-301 free dumps.. DHCP Relay.17.2.1 Configuring a DHCP ServerThe following commands are commonly used when configuring a DHCP server on a Cisco IOS device.IOS(config)# service dhcp IOS(config)# ip dhcppool pool_name network network_number [mask | /prefix-length] domain-name IOS(dhcp-config)# domain IOS(dhcp-config)# dns-server address [ address2... address8] IOS(dhcp-config)# default-router address IOS(dhcp-config)# lease (days [hours] [minutes] | infinite} exit IOS(dhcp-config) # IOS(dhcp-config) # IOS(dhcp-config)# default-router address config)#Chapter 17 Cisco Device Management Protocol 431IOS(config)# ip dhcp excluded-address low-address [high-address]Command servicedhcp Enables DHCP server and/or relay functionality on the IOS device. Without this command, the IOS device will not act as a server and relay agent. As of IOS 12.2, this command is enabled by default. The command ipdhcp pool creates a DHCP server address pool name and switches to DHCP address pool subcommand mode. The command network specifies the subnet number and subnet mask of the DHCP address pool. The prefix length specifies how many bits the network portion contains, which is another way to specify the subnet mask. The prefix length must be preceded by a slash (/) o The command domain-name specifies the domain name to be assigned to the client. The command dns-server specifies the IP address of the DNS server available to the DHCP client; at least one IP address must be provided, but up to eight IP addresses can be specified. The command default-router specifies the default gateway IP address to be assigned to the DHCP client. The command lease specifies the lease period. IP addresses are usually leased to hosts on a temporary basis, and after the address lease is half over, the client will attempt to renew the previously acquired addressing information. If the lease fails, the device will keep trying to renew the lease until the lease period expires. The default lease period is 1 day. Other parameters can be specified when configuring the address pool, such as the TFTP server address for use by VoIP phones, but these are beyond the scope of this book.The DHCP server assigns IP address parameters to the requesting host. On the Cisco IOSDHCP server, addresses are defined using an address pool. When assigning a network number to the address pool, be sure to exclude network addresses and directed broadcast addresses. IP addresses are usually leased to hosts on a temporary basis. Halfway through the address lease, the client will attempt to renew the previously acquired addressing information, and if it fails, it will continue to do so until the lease expires.The command ipdhcpexcluded-address specifies such IP addresses, that is, they are included in the network number you specify for the DHCP address pool, but the DHCP server should not assign them to DHCP clients. These are addresses that are already in use on the subnet, such as those statically assigned to switches and routing devices. When assigning network numbers to the address pool, be sure to exclude network addresses and directed broadcast addresses. Note that this command is not an address pool configuration command, but a global configuration command.