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 locations. Cisco IOS allows routers to forward broadcasts through the ip helper-address command. When configured, a router will forward broadcasts to select UDP ports to pred..
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 draws much less current than when the card is operating actively. Thus, power-save mode can conserve batteries on mobile devices. In fact, power-save mode often lengthens battery li..
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 unauthorized access or misuse. The difference is clear: security is a superset of confidentiality because it goes beyond protecting information by also protecting system functions and pr..
Creating a VPN Between a Workstation and a Router
There are several steps to configuring a router to accept IPSec VPN connections from remote PCs. The following discussion doesn't include requirements for the PC's software configuration, just the router's configuration. You should refer the software vendor's documentation for information about configuring the workstation software: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#aaa new-model Router1(config)#aaa a..
InterVLAN routing first requires that routing be enabled for the Layer 3 protocol. In the case of IP, you would enable IP routing. In addition, you must configure static routes or a dynamic routing protocol. These topics are covered fully in the CCNP ROUTE course. By default, every switch port on most Catalyst switch platforms is a Layer 2 interface, whereas every switch port on a Catalyst 6500 is a Layer 3 interface. If an interface needs to operate in a different mode, you ..
