Answer / 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

Answer / dharmendra kumar soni

1> L3 switches do not have WAN interfaces.
2> we can connect Ethernet circuits to a switch so you only
need a router.
3> As far as I know Call Manager Express does not run on a
switch but does on a router.
4>L3 Switch do switching at layer 3 by preserving the source
and destination mac.
5>router do normal routing lookup.
6>Switches doesnt support some QoS features.
7>Switches doesnt support NAT.
8>The forwarding packet on switches is done on ASIC
(Application Specific Integrated Circuits)
9>which is done in hardware rather than a software.
10>Forwarding packet on routers are done in a software.
11>router supports different WAN technologies unlike switches.
12>We can not implement routing on cisco layer switch.
13> We can not connect ISP directly to cisco layer 3 switch.



I think this is some main difference between router and switch.


Thanks,
D.Soni

Answer / johnny rajpal

Switch:- it is used when we connect more than one computer
for thier communication.Switch works on source MAC address.
Switch are of two types:-
1. unmanageable and
2.manageable

1.Unmanageable- In this we cannot manage it according to our
need. In this there is no operating System.

2. Manageable - this switch we can manage it according to
our need. Example - we configure password. we install
operating system in this switch.

Cisco router:- It is used for communication of two different
networks and give them best routing path for their
communication.
Example- ist n/w is 192.168.10.0 and
2nd n/w is 192.168.11.0

Answer / farhan

I guess the first answer of jitendra is the one
1. l3 switch :
Is the one which know where to route the packet , but don't
know to do additional feature or ooption. In simple word if
you are going to goa it says take this road you will reach
there.

2. Router:
Is the one which know where to route the packet and how to
route the packet. Have feature like nat, ttl decrementing,
divide broadcast domain, computing header checksum,
Multicasting of packet. In simple word if you are going to
goa it says take this road, take this train, you will reach
by this time and be well dressed.

Answer / jitendera

1> L3 switches do not have WAN interfaces.
(lan properties)
2> we can connect Ethernet circuits to a switch so you only
need a router.
(wan properties)
3> As far as I know Call Manager Express does not run on a
switch but does on a router.
(we can use call manager as well as switch or router)
4>L3 Switch do switching at layer 3 by preserving the source
and destination mac.
(work on l3 by taking table from router Control plane)
5>router do normal routing lookup.
(wan properties)
6>Switches doesnt support some QoS features.
(all quo is supported by some higher version of l3switch
7>Switches doesnt support NAT.(
its a wan properties)
8>The forwarding packet on switches is done on ASIC
(Application Specific Integrated Circuits)
L2 properties
9>which is done in hardware rather than a software.
lan proerties
10>Forwarding packet on routers are done in a software.
lan proerties
11>router supports different WAN technologies unlike switches.
wan properties
wan properties
12>We can not implement routing on cisco layer switch.(on l3
we can if it is intranet)
13> We can not connect ISP directly to cisco layer 3 switch.
we can connect if you are using rj45 conecter to the switch and have the range of public ip address)

ho dsopni what ever the point u have writen in the urs answer that can be stated as
switch is best in lan router is best in wan ?
thanks

Answer / s.m.feroz ahmed

Hi,

Difference between Cisco Router and layer 3 switch is
Network Associate/Engineer and System Engineer or Windows
Admin.

Answer / rahul dixit

kool
i was serching the answer of this question from 10 days and
at last i desided to google it and on first try i got yours
answer on this site
and i suppose that no book can give the better answer from
this answer
really u have the great knowledge in the networking. by
seening all answers provided by you i want to say.

Heas off to you

Please keep posting the answer and do not go away from this
site.

rahul dixit

Answer / rohan

1.)THE ROUTER MUST BE PLACED IN THE WAN MINIPORT POSITION.
2.)MAKE THE WIFI IS RESEMBLE THE ROUTER IN A POSITION THAT
A LASER BEAM IS SUPPOSED TO REAC THE LAN SEETINGS
3.)MAKE THE SEETINGS OF ROUTER AS IT IS CONNECTED.
4.)JUST ENABLE THE SEETINGS THAT WE CAN CONNECTED IT
PROPERLY UNDER DISGUISTE CONDITIONS THAT A COMPUTER CAN
WORK MORE COMFOTABELY

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