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CCNA Notes : cont... 42. While a packet travels through an Internetwork, it usually involves multiple hops. Note that the logical address (IP address) of source (that created the packet) and destination (final intended destination) remain constant, the hardware  (Interface) addresses change with each hop. 43. Default administrative distances some important routing protocols are as below: Route Source                        Default Distance Directly connect Interface        0 Static Route                            1 IGRP                                    100 RIP                                      120 Unknown                              255 An administrative distance of 0 represents highest trustworthiness of the route. An administrative distance of 255 represents the lowest trustworthiness of the route. Routed and Routing protocols: -          Routing protocols job is to maintain routing tables and route packets appropriately. Examples of routing protocols are RIP, IGRP, EIGRP, OSPF. Routers can support multiple independent routing protocols and can update and maintain routing tables for each protocol independently. -          Routed protocols are used to transport user traffic from source node to destination node. Examples of routed protocols are IP, IPX, AppleTalk.