CCNP ONT Official Exam Certification Guide
by Amir S. Ranjbar - CCIE No. 8669
Publisher: Cisco Press
Pub Date: May 21, 2007
Print ISBN-10: 1-58720-176-3
Print ISBN-13: 978-1-58720-176-9
This official study guide helps you master all the topics on the CCNP ONT exam, including
It is important to note that the ip helper-address command does not just forward DHCP requests. In fact, although you can configure it to forward any UDP broadcast you want, by default it will forward UDP broadcast packets for several different UDP ports to the specified address. In some cases, this unwanted traffic can cause problems on the network or DHCP server. Read the rest of this entry »
The traditional role of routers in DHCP has been simply to act as a proxy device.DHCP proxy function is still the most common for routers.
Initial DHCP request comes from a client that typically doesn’t have an IP address, it must find the server using a Layer 2 broadcast. So, if the router was not able to function as a proxy for these broadcasts, it would be necessary to put a DHCP server on every network segment. Read the rest of this entry »
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