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The use of a DHCP relay agent is an agent that relays DHCP between DHCP clients and DHCP servers on different IP networks. The DHCP relay agent is compliant with RFC 1542.
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Which of the following network components are typically capable of functioning as DHCP relay agents?
Router & Win 2008
How does DHCP allow devices to communicate?
They use DHCP to assign IP Addresses to Devices such as Windows XP, Networking flashcards, OIt DHCP and BootP services, and connecting routers. The definition for DHCP is Dynamic Host Configuration Protocol.
How do you enable the dhcp?
The method of enabling DHCP depends on the OS in use. On Windows, DHCP can be enabled by activating the 'Automatically choose IP address' setting in the connection properties dialogue box of the connection.
What ports are used by dhcp and the DHCP client?
The port 67 and port 68 are used by DHCP and the DHCP clients.
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.
What service allows DHCP communications to cross network boundaries?
Dhcp relay agent
What is required to propagate dhcp messages between routed sub-nets?
DHCP relay agent
How can you configure DHCP Relay Agent?
Using routing and remote access server role
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.
What is dhcp relay service?
hope this would help: http://www.tech-faq.com/dhcp-relay-agent.shtml
The DHCP relay agent capability is built into which role in Windows Server 2008?
, the DHCP relay agent is now available under the Network Policy Server. When installing this role, select a role service "Routing and Remote Access" to be installed. The rest is the same like in Windows Server 2003 - just configure it using RRAS administrative console.
Weather dhcp offer is unicast or not?
The answer is yes. The RFC 1541 states that a server "should" try unicast first, but then can use broadcast when offering. Some OS's like Microsoft skip the unicast part of this as it is not required. I would like to improve upon this answer As i see in RFC 1541, server would try to unicast DHCP offer in case it has received DHCP Discover from a DHCP relay agent otherwise it would broadcast. Would like to know if anybody differ in opinion....
What is DHCPINFORM?
DHCPInform is a DHCP message used by DHCP clients to obtain DHCP options. While PPP remote access clients do not use DHCP to obtain IP addresses for the remote access connection, Windows 2000 and Windows 98 remote access clients use the DHCPInform message to obtain DNS server IP addresses, WINS server IP addresses, and a DNS domain name. The DHCPInform message is sent after the IPCP negotiation is concluded. The DHCPInform message received by the remote access server is then forwarded to a DHCP server. The remote access server forwards DHCPInform messages only if it has been configured with the DHCP Relay Agent..
What networking function is required if the DHCP server is not on the same LAN?
DHCP Relay, called a helper-address in Cisco systems.
What command enables a DHCP relay on a Cisco router?
hal-loosi
What will be the result of installing a relay agent and DHCP server on the same machine?
According the the MCSE Guide to managing a Microsoft windows server 2003 network, enhanced book the answer would be that it causes erratic behavior.
Which of the following network components are typically capable of functioning as DHCP relay agents?
Router & Win 2008
