All about wireless networking and NMS/EMS

Classful vs Classless network : spires_23   06-Sep-2011 09:31  ( in response to Krishna ) Classful is based on the default Class A,B or C networks. - Class A: 0 - 127 with a mask of 255.0.0.0 (/8) - Class B: 128 - 191 with a mask of 255.255.0.0 (/16) - Class C: 192 - 223 with a mask of 255.255.255.0 (/24) All devices in the same routing domain must use the same subnet mask. Since routers running a classful routing protocol do not include subnet mask information with routing updates, the router assumes either its own subnet mask, or defaults to the classful subnet mask. Classless on the other hand, allows the use of variable length subnet masks, or VLSM, because subnet mask information is included with routing updates. You can have a mixture of different subnet masks in the same routing domain: - 10.1.0.0/19 - 10.2.0.0/20 - 172.16.8.0/21 - 172.16.16.0/24

Introduction: Administrative distance: Most routing protocols have metric structures and algorithms that are not compatible with other protocols. In a network with multiple routing protocols, the exchange of route information and the capability to select the best path across the multiple protocols are critical. Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. Select the Best Path Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the