Answer Posted / jitendera sinha

if this one is the interview question in cisco then u have
to tell that switch it is ither l2 or l3 is best in lan

where as the routers are best in wan

now a much complex approch layer 3 Routing Versus Layer 3
Switching.
It is important to understand the difference between Layer.
3 routing and Layer 3 switching. Both terms are open to
some interpretation; however, the distinction between both
can perhaps be best explained by examining how an IP packet
is routed. The process of routing an IP packet can be
divided into two distinct processes:

Control plane—The control plane process is responsible for
building and maintaining the IP routing table, which
defines where an IP packet should be routed to based upon
the destination address of the packet, which is defined in
terms of a next hop IP address and the egress interface
that the next hop is reachable from. Layer 3 routing
generally refers to control plane operations.

Data plane—The data plane process is responsible for
actually routing an IP packet, based upon information
learned by the control plane. Whereas the control plane
defines where an IP packet should be routed to, the data
plane defines exactly how an IP packet should be routed.
This information includes the underlying Layer 2 addressing
required for the IP packet so that it reaches the next hop
destination, as well as other operations required on for IP
routing, such as decrementing the time-to-live (TTL) field
and recomputing the IP header checksum. Layer 3 switching
generally refers to data plane operations.



if there are mulitiple choice answers then mention all
answeres then only i can make answers in depth


Thanks and regards

Jitendera kumar sinha

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