Android Flash

IP routing-
Router-Router is an internetworking device.which works at L-3 (network layer) of the OSI model. it is used for communicate networks within different topology, network and physical protocols. it is the most intelligent networking device.

a) Routing is a process perform by router. it is used for identify the best path from source to destination in the internetwork.

b) The process of communicating different networks to each other is called Routing.

c) Router performs the routing. Router is a L-3 device.so routing is a L-3 process.
For perform the routing, router maintains a table called its routing table or IP table.

Routing table : in the routing table router stores all the informations of its connected networks.
By default router stores the entries of its directly connected networks in the routing tables.router identity only networks in the routing table.
Routing Identify only network not host in the routing table. by default all the configuration stores in the RAM.
Routing is a process of exchange the routing table information with each router in the topology.

CDP : Cisco discovery protocol
CDP is a protocol originally designed by Cisco.so it is Cisco proprietary protocol by default configured in all cisco devices..
But does not support non-cisco devices.
CDP is used for show all types of information of its neighbour connected networking devices.

Commands : 
Router# Show cdp
(Show all the information of CDP timers).

Router# show cdp neighbours
(Show interface of neighbours).

R# show cdp neighbours details
(Show all the details of neighbours).

CDP timers:
1.Hello timer=60secs
2.Invalid timer=180secs
3.Flash timer =240secs.