Acting as a DHCP Relay

Normally, routers do not forward broadcast. There are a few times when an exception to this rule would be useful. IP assignment, for instance, would be easier if you did not have to deploy a DHCP server on every segment. If routers passed broadcasts then a central server could take care of remote lo...

Power-Save Mode

Most radio cards employ an optional 802.11 power-save mode that users can enable. Access points do not implement power-save mode, except for the buffering functions necessary to support powersaving functions of the radio cards. If power-save mode is enabled, the radio card enters sleep mode, which d...

Confidentiality and Security Are Not the Same

Confidentiality and security are not the same. Here is a working definition of the two terms: Confidentiality is the protection of information to ensure that it is not disclosed to unauthorized audiences. Security is the protection of systems, resources, and information from unintended and un...

Generating RSA Keys

The first thing to notice is that the output includes the following line: The name for the keys will be: Router1.oreilly.com The router name and domain name are always included in the key. So it is critical to define these two values before generating the keys. If you generate the keys first a...

Manual Summarization at ABRs

The more difficult task with OSPF route summarization occurs when planning the design of IP address blocks and OSPF areas. When the IP addressing plan and OSPF design have been completed, if the subnet numbers inside an area happen to be from the same general range, and none of the subnet in that ra...

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