January 2001
Intermediate to advanced
288 pages
7h 52m
English
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Network Topology
When designing a DHCP infrastructure, it is important to take into account the topology of the network being serviced. By determining the topology, the designer will be able to anticipate where the load on the DHCP servers may be high and identify single points of failure that may cause DHCP services to be disrupted.
There are two different areas that need to be examined:
The physical layout of the network
The number of users in each physical location
By determining the physical layout of the network, the designer will be able to create a list of subnets that need to be serviced by DHCP. This information will be needed when scopes are created later.
Another important factor is the placement of DHCP relay agents. The physical layout of the network establishes which routers and subnets will need to be serviced by relay agents.
The number of users in each location helps determine the placement of DHCP servers. If there are a small number of users located in a single location, the DHCP server may be placed in a remote subnet with a DHCP Relay Agent set up on the router to listen for DHCP requests. This eliminates the need to place a server physically on the LAN where the users reside. If the WAN link goes down, the number of users disrupted is minimized.
Warning
If some of your DHCP clients at remote sites are Windows 2000 or Windows 98 systems and the WAN link goes down, they will not be able to contact a DHCP server. As mentioned earlier in this chapter, when these operating ...
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