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The Dynamic Host Configuration Protocol (DHCP) is a network management protocol commonly used for (among other things) assigning dynamic IP addresses to network clients. The primary benefit of using this technology is you can take a finite amount of IP address space and partition it out to transient users as it is needed, reclaiming addresses no longer in use. The use of DHCP also saves end users and desktop administrators from manually assigning IP addresses to systems. Let's look at how DHCP works.
When configuring DHCP, the network administrator sets a value known as the DHCP lease. This is the amount of time a system may retain an IP address without contacting the DHCP server. When the time expires, the system must reach out to the server and request a renewal of the DHCP lease. Generally speaking, DHCP leases are set to a long period of time (measured in days) on stable networks where the same systems are generally present from day-to-day. On the other hand, networks with many transient users (such as public hotspots) typically have short lease times to allow the efficient reuse of addresses.
DHCP churn is a term used to describe the fact that different systems may obtain the same IP address from a DHCP server when the first system's lease expires. This really isn't a problem, except in two special cases:
- You're trying to track systems for some purpose and don't have access to the DHCP logs. For example, if you're maintaining a spam blacklist and a spamming system shows up on your blacklist with a DHCP-provided address, you may inadvertently block future users of that address from sending mail.
- You're a researcher measuring the prevalence of some phenomenon across the internet and use IP addresses to track systems. If a single system exhibits your target behavior, but has many different dynamically assigned addresses, it might skew your results.
The bottom line is, unless you're in one of those two very special cases, DHCP churn isn't a big deal. You should set your DHCP lease lifetime based upon your expected users needs and not worry about this issue.
*This answer was taken from the related link.
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∙ 11y ago
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What are two reasons why static ip addressing would be configured instead of DHCP when setting up a wireless network?
The network has relatively few wireless devices.
How can two different networks using DHCP links together?
There can only be one DHCP server on a network. Two DHCP servers will conflict.
Can you configure two dhcp server on a same network?
yes, one can configure two dhcp server on a same network. But for doing this, one has to define different scopes in both dhcp server in order to avoid ip address conflict. Eg. one can configure a scope for a lan with network address of 10.0.0.0 as- 10.0.0.10- 10.0.0.100 in one dhcp server. while other scope would be 10.0.0.101-10.0.0.200 . In this way we can have to dhcp servers on a same network. Which ever dhcp server receives the request for the ip address will provide the ip address. IN case for servers, one can use mac bindingin both servers so that they obtain same ip address
In the Absence of dhcp server which ip client will receive?
A DHCP server will privide a client with a valid IP address for the network for which the DHCP server is providing a service.Where there is no DHCP server the IP address for a client must be set manually. When doing this care must be taken to ensure that two IP addresses are not set the same on the network.
A network has grown too large for technicians to configure network addresses and hosts files for name resolution Which two application layer services should be added to the server to allow these?
DNS and DHCP
When a dhcp server is configured which two ip address should never be assignable to host?
Network or subnetwork IP address. Broadcast address on the network
Which two network services are required for dynamic updates to function properly in a windows 2008 environment?
DNS and DHCP
You have installed and configured a dhcp server on your network. you also have a web server on the same network. The web server requires the same ip address as the dhcp server what should you do?
The only way that could work is if the DHCP service and the HTTP service were configured and running on the same physical machine. Otherwise they could not use the same IP address. DHCP and HTTP do not have to be on separate machines (but it is a good idea to separate them in a network). A better question might be why the two services *require* the same IP address.
How you can communicate two lan segments?
People use servers for such purposes. The server should have at least two network interfaces. Using DHCP server options you can connect two and more networks together.
What kind of IP addressing is used when a DHCP server is not available on a network?
as we know two types of ip are used so here static ip used
What is scope and super scope?
A DHCP scope is a valid range of IP addresses which are available for assignments or lease to client computers on a particular subnet. In a DHCP server, you configure a scope to determine the address pool of IPs which the server can provide to DHCP clients. Scopes determine which IP addresses are provided to the clients. Scopes should be defined and activated before DHCP clients use the DHCP server for its dynamic IP configuration. You can configure as many scopes on a DHCP server as is required in your network environment Using superscopes A superscope is an administrative feature of DHCP servers running Windows Server 2003 that you can create and manage through the DHCP console. Using a superscope, you can group multiple scopes as a single administrative entity. With this feature, a DHCP server can:Support DHCP clients on a single physical network segment (such as a single Ethernet LAN segment) where multiple logical IP networks are used. When more than one logical IP network is used on each physical subnet or network, such configurations are often called multinets.Support remote DHCP clients located on the far side of DHCP and BOOTP relay agents (where the network on the far side of the relay agent uses multinets).In multinet configurations, you can use DHCP superscopes to group and activate individual scope ranges of IP addresses used on your network. In this way, the DHCP server computer can activate and provide leases from more than one scope to clients on a single physical network. Superscopes can resolve certain types of DHCP deployment issues for multinets, including situations in which: The available address pool for a currently active scope is nearly depleted, and more computers need to be added to the network. The original scope includes the full addressable range for a single IP network of a specified address class. You need to use another IP network range of addresses to extend the address space for the same physical network segment.Clients must be migrated over time to a new scope (such as to renumber the current IP network from an address range used in an existing active scope to a new scope that contains another IP network range of addresses).You want to use two DHCP servers on the same physical network segment to manage separate logical IP networks.Superscope configurations for multinets The following section shows how a simple DHCP network consisting originally of one physical network segment and one DHCP server, can be extended to use superscopes for support of multinet configurations. Example 1: Non-routed DHCP server (before superscope) In this preliminary instance, a small local area network (LAN) with one DHCP server supports a single physical subnet, Subnet A. The DHCP server in this configuration is limited to leasing addresses to clients on this same physical subnet. The following illustration shows this example network in its original state. At this point, no superscopes have been added and a single scope, Scope 1, is used to service all DHCP clients on Subnet A. Example 2: Superscope for non-routed DHCP server supporting local multinets To include multinets implemented for client computers on Subnet A, the same network segment where the DHCP server is located, you can configure a superscope which includes as members: the original scope (Scope 1) and additional scopes for the logical multinets for which you need to add support (Scope 2, Scope 3). This illustration shows the scope and superscope configuration to support the multinets on the same physical network (Subnet A) as the DHCP server. Example 3: Superscope for routed DHCP server with relay agent supporting remote multinets To include multinets implemented for client computers on Subnet B, the remote network segment located across a router from the DHCP server on Subnet A, you can configure a superscope which includes as members: the additional scopes for the logical multinets for which you need to add remote support (Scope 2, Scope 3). Note that since the multinets are for the remote network (Subnet B), the original scope (Scope 1) does not need to be part of the added superscope. This illustration shows the scope and superscope configuration to support the multinets on the remote physical network (Subnet B) away from the DHCP server.
Can a LAN have two DHCP servers?
Yes, a LAN could have two DHCP servers, but it wouldn't make much sense. Typically each LAN has it's own DHCP server or uses a DHCP relay agent to get an address from another subnet.
