DHCP server configuration
DHCP relay agent
A DHCP configuration that provides DHCP service to multiple VLANs. The relay agent receives a DHCP-related message, then creates its own message to send the specified DHCP traffic beyond the broadcast domain.
You have a Windows Server 2016 system that you want to use as a DHCP relay agent. Which Windows Server 2016 service would you use to do this? Network Policy Server Routing and Remote Access DNS Internet Information Services (IIS) Manager
routing and remote access
For DHCP server to deliver IP addresses it must have a
scope configured
After you activate a scope you
should not change it
The server must have a
static IP address
What are the commonly used DHCP options
submask net default gateway address DNS server address
A scope has a submask that determines the
subnet for a given IP address
On the DHCP console a and exclamation point inside a blue circle indicates
that 100% of available addresses for server scopes are either in use or leased
On the DHCP console a exclamation point inside a yellow triangle indicates
that 90% of available addresses for server scopes are either in use or leased.
The scope must be activated before
the DHCP server can assign addresses to clients.
On the DHCP console a check mark in a green circle indicates
the DHCP server is connected and authorized
On the DHCP console a red down arrow indicates
the DHCP server is connected but not authorized
DHCP Request
A message returned to a DHCP server by a client that asks to lease an IP address from the DHCP server.
lease duration
A parameter of a DHCP IP address lease that specifies how long a DHCP client can keep an address.
DHCP Offer
An attempt by a DHCP server to present a requesting client a valid IP address from its scope or pool of available addresses
You have a TCP/IP network with 50 hosts. There have been inconsistent communication problems between hosts. You run a protocol analyzer and discover that two hosts have the same IP address assigned. Which protocol can you implement on your network to help prevent problems such as this? DHCP TCP IP SNMP IGMP ICMP
DHCP
You have a network with 50 workstations. You want to automatically configure workstations with the IP address, subnet mask, and default gateway values. Which device should you use? Gateway DNS server DHCP server Router
DHCP server
Which two of the following statements about the dynamic host configuration protocol (DHCP) are true? A DHCP server assigns addresses to requesting hosts. It cannot be configured to assign the same IP address to the same host each time it boots. It is only used to deliver IP addresses to hosts. It can deliver other configuration information in addition to IP addresses.
DHCP servers deliver IP addresses as well as other host configuration information to network hosts. DHCP can be configured to assign any available address to a host, or it can assign a specific address to a specific host.
Your Windows DHCP server had a default lease time of eight days. However, you have decided to reconfigure this DHCP server to dynamically assign IP addresses to DHCP clients using a lease duration of four days. What impact, if any, will this have on the network? No impact Router performance will improve Increased network traffic Network bandwidth will increase Decreased network traffic
Increased network traffic
Can you change the subnet mask used by a n existing DHCP scope?
NO, to change the subnet mask used by the scope you must delete and recreate the scope.
DHCP ACK
Sent by the server to the client in response to a DHCP REQUEST. The DHCP ACK indicates that the server "acknowledges" the request, and the DHCP ACK message contains fields which indicate the IP address, lease time, and network configuration parameters that the client is being configured with.
You are configuring the DHCP Relay Agent role on a Windows server. Which of the following is a required step for the configuration? Specify which server network interface the agent listens on for DHCP messages. Use the ip helper-address command to specify the remote DHCP server. Configure the Windows server to be on the same subnet as the DHCP server. Connect an RFC 1542 compliant router to the Windows server.
Specify which server network interface the agent listens on for DHCP messages. When configuring the DHCP Relay Agent role, you need to specify which server network interface the agent will listen on for DHCP messages. The ip helper-address command is used to configure DHCP relay on Cisco routers, not Windows servers. An RFC 1542-compliant router is not necessary for DHCP relay when using the Windows Server DHCP Relay Agent. Configuring the Windows server to be on the same subnet as the DHCP server would prevent the server from being able to relay DHCP messages from a different subnet. References
DHCP Discover
The broadcast packet that is used to elicit a DHCP offer from a DHCP server.
Due to widespread network expansion, you have decided to upgrade the network by configuring a DHCP server. The network uses Linux, Windows, and Mac OS X client systems. You configure the server to distribute IP addresses from 192.168.2.1 to 192.168.2.100. You use the subnet mask of 255.255.255.0. After making all setting changes on the DHCP server, you reboot each client system, but they are not able to obtain an IP address from the DHCP server. Which of the following would explain the failure? DHCP does not work in a heterogeneous computing environment unless the DHCP Samba client software is installed. 192.168.x.x requires a class C subnet mask. The DHCP server must be rebooted. The clients must be configured to obtain IP addressing from a DHCP server. DHCP does not function in a heterogeneous computing environment.
The clients must be configured to obtain IP addressing from a DHCP server. Once a DHCP server has been configured for the network, each client system has to be told to look for a DHCP server to obtain its IP addressing. Selecting DHCP to obtain IP addressing information is typically as easy as selecting a radio button. If the client is not set to DHCP, it will look for a statically assigned IP address. The DHCP service is supported by all major operating systems today. Using DHCP among different client systems would not be a problem. Rebooting the DHCP server would not be helpful if the client systems are not configured to use the DHCP service.
DHCP scope
The predefined range of addresses that can be leased to any network device on a particular segment.
Which of the following strategies are used to prevent duplicate IP addresses being used on a network? (Select two.) Install the DHCP client on all workstations. Use Automatic Private IP Addressing. Configure client systems to use static IP assignment. Configure a HOSTS file for local IP resolution. Set the Windows network-monitoring utility to identify potential IP conflicts. Install a DHCP server on the network.
To avoid duplicate IP addresses being used by network systems, automatic IP assignment is used. Both the DHCP service and APIPA can automatically assign addresses to client systems. Clients configured to use static IP addressing may inadvertently have duplicate IP addresses assigned to them. In such a case, one of the systems will not be able to log on to the network.
You need to configure a Cisco RFC 1542-compliant router to forward any received DHCP frames to the appropriate subnet. The address of the remote DHCP server is 172.16.30.1 Which of the following commands would you use to configure the router? ip helper-address 172.16.30.1 host 172.16.30.1 ip address dhcp 172.16.30.1 ifconfig 172.16.30.1
To configure a Cisco router to listen for DHCP traffic and route any received DHCP frames to the appropriate subnet, use the following command: ip helper-address [server_address] The ifconfig command is used on a Linux computer to display TCP/IP configuration information. The host command is used to query the A records of a specified host. The ip address dhcp command is used to configure a Cisco switch to obtain its IP address from a DHCP server.
You are implementing a DHCP server for your segment. Your segment's IP address is 192.168.1.0. Your default gateway address is 192.168.1.254. Your DNS server address is 192.168.1.1. Your default gateway is configured as a NAT router to translate addresses between network segments. You configured the 03 Router option on your DHCP server so it can deliver the IP address of the default gateway to workstations. After configuring your workstations to get their IP addressing information dynamically, your users complain that they are unable to access websites on the internet. How can you resolve this problem? You must implement a BOOTP server instead of a DHCP server. You must configure Automatic Private IP Addressing (APIPA) on each workstation using default settings. You must configure your DHCP server with an option that enables IP forwarding (Option19). You must configure your DHCP server with an option that delivers the IP address of the default World Wide Web server (Option 72). You can't implement a DHCP server in conjunction with a NAT router. You must configure your DHCP server with an option that delivers the IP address of the DNS server (Option 06).
You must configure your DHCP server with an option that delivers the IP address of the DNS server (Option 06). Explanation In this scenario, the DHCP server hasn't been configured to deliver the IP address of the DNS server to the workstations. When users try to access websites with a browser, they receive an error message because their workstations can't resolve URLs into IP addresses. To fix this problem, you must enable the 06 Domain Name Server option on the DHCP server and configure it with the IP address of your DNS server. You could statically configure APIPA on each workstation with the IP address of the DNS server, but doing this would defeat the purpose of implementing a DHCP server in the first place.
Server options are applied to
all computers that get IP addresses from the DHCP server, regardless of which scope they obtain the address from
A MAC reservation is an
association of a MAC address with a specific IP address
The DHCP service needs to
auto-start when the server boots
On the DHCP console a horizontal white line inside a red circle indicates that the DHCP server is
connected but the current user does not have the administrative credentials necessary to manage the server.
The DHCP console provides
context-sensitive icons to reflect DHCP server status
RFC 1542 Compliant Router
listens for DHCP traffic and routes any recieved DHCP frames to the appropriate subnet
There should only be one scope per
network segment
An IP configuration means you
program MAC addresses into the DHCP server. When the DHCP server sees a certain host requesting an IP address based on its MAC, it will give you a specific IP address
In addition to providing IP addresses, a DHCP server can also
provide clients with additional IP configuration parameters using options.
Client options are applied
to a specific DHCP client, The clients MAC address is used to identify which system recieves the option.
Scope options are applied
to all computers that get an IP address from a particular scope on the DHCP server
