ccna version 7 pdf

ccna version 7 pdf.In this example, all STATIC entries represent the switch itself; the last three entries represent the MAC addresses learned from the first three interfaces of the switch. By default, the 2960 switch can store in the CAM table 8192Total Mac Addresses for this criterion: 12To delete dynamically learned entries in the CAM table (when no stacking is configured), execute the command clear in privileged EXEC modemac-address-tableoPractical experience In the port address table, there will be no broadcast or multicast addresses because they will not be used as the source address of the frame and therefore will not be known to the switch.Exam Point Be sure to familiarize yourself with the output of the command showmac-address-table. If the destination MAC address of the traffic does not appear in the CAM table (unknown),the switch will flood it.11.4.2 Static EntriesIn addition to having the switch be dynamically informed of MAC addresses, static entries can be created manually, possibly for security reasons. If a user moves from one switch port to another, and you statically associate their MAC address to the original port, their traffic will not be forwarded correctly. To forward this traffic correctly, you must modify the old entry so that it indicates the new port to which the user is connected. You may have configured the static entry to prohibit a user from unplugging a connection from one port and plugging it into another port in order to access more network resources.Unlike dynamic entries in the CAM table, static entries do not expire, even if you reboot the switch (provided the configuration is saved).Also, if you configure a static entry for a device, after moving the device to another port, the static entry always overrides the information the switch learns, although the switch will learn of the change.On the 2960 switch, to create a static entry in the CAM table, use the following command.