cisco ccna test cost

cisco ccna test cost.The following shows the network configuration information that can be provided through DHCP.IP address. Subnet mask.The IP address of the default gateway.The IP address of the DNS server.Domain name. The DHCP server and client devices use UDP ports 67 and 68, respectively, as transmission ports for DHCP protocol messages. The following shows the various DHCP message types.DHCPDISCOVERY message: sent by the DHCP client for the purpose of discovering the DHCP server within the LAN. The message can contain certain requirements of the DHCP client for the IP address or lease period, and its destination IP address is the network broadcast address or broadcast address 255.255.255.255, and the source IP address is usually 0.0.0.0o DHCPOFFER) message: sent by the DHCP server to the DHCP client, which will contain a proposed IP address (named YIADDR) and a subnet mask. The message must also contain the DHCP server ID, which is the IP address of the server (named SIADDR) o Since multiple DHCP servers may be deployed within the LAN, there may be more than one DHCPOFFER message in response to a DHCPDISCOVERY message.DHCP REQUEST) SHOOT: The destination IP address is a broadcast address, sent by the DHCP client, and serves to acknowledge the DHCP OFFER message from the specified server. The message will contain the SIADDRO of the DHCP server selected by the DHCP client The reason the destination IP address of this message is a broadcast address rather than a unicast address is that the DHCP client also has to inform other DHCP servers that the local machine has not yet chosen to use of its choice.DHCPACKNOWLEDGMENT (DHCPACK) message: sent by the DHCP server to the DHCP client to confirm the proposed IP address and other network configuration information.DHCPNOTACKNOWLEDGED(DHCPNACK) message: sent to the DHCP client if some problem related to IP address assignment occurs after the DHCP server sends a DHCP OFFER message.