A switch is just a another n/w device which has its own 
Advantages and Disadvantages as compared to a 
HUB/Router/Bridge etc ... I hope it doesnt have any 
disadvantages as such unless and until compared to other 
n/w devices[Note : This is just my opinion,please add 
details if you have some]

Advantages :
1) Reduces the number of Broadcast domains
2) Supports VLAN's which can help in Logical segmentation 
of ports[physical ports].Splitting up the broadcast domain.
3) Intellegent device[compared to Hub's] which can make use 
of CAM table for Port to MAC mapping
4) Compared to Bridges ,Switches are more H/w oriented 
therefore operations are less CPU intense[Basic operations]
.
5) The cost to number of ports ratio is best .. ie For a 
cheaper cost you get switches with more number of ports 
available than Routers.

Disadvantages :

1) Not as good as a router in limiting Broadcasts
2) Communication b/w VLAN's need interVLAN routing [Router]
,but these days there are a number of Multilayer switches 
available in the market.
3) Handling Multicast packets needs quite a bit of 
configuration & proper designing.
4) At times swtiches when in Promiscuos mode is a opening 
for Security attacks [Spoofing ip address  or capturing 
Ethernet Frames using ethereal]

I would definitely arguee with the interviewer that 
switches are designed for what they are & there is 
disadvatage as such unless it is compared to other layer 
devices.At Layer 2 it does what other devices of layer 2 
cant do & it was initally meant to work at Layer 2,even 
though it works at multiple layers these days.

Reposting it as the Poster name got changed to Guest 
probably due to auto logout ..
Also the last few lines had some typo.. corrected them 
here.There should be some way to edit the posting in this 
site.At least my own posting should be made available for 
editing :(

A switch is just a another n/w device which has its own 
Advantages and Disadvantages as compared to a 
HUB/Router/Bridge etc ... I hope it doesnt have any 
disadvantages as such unless and until compared to other 
n/w devices[Note : This is just my opinion,please add 
details if you have some]

Advantages :
1) Reduces the number of Broadcast domains
2) Supports VLAN's which can help in Logical segmentation 
of ports[physical ports].Splitting up the broadcast domain.
3) Intellegent device[compared to Hub's] which can make use 
of CAM table for Port to MAC mapping
4) Compared to Bridges ,Switches are more H/w oriented 
therefore operations are less CPU intense[Basic operations]
.
5) The cost to number of ports ratio is best .. ie For a 
cheaper cost you get switches with more number of ports 
available than Routers.

Disadvantages :

1) Not as good as a router in limiting Broadcasts
2) Communication b/w VLAN's need interVLAN routing [Router]
,but these days there are a number of Multilayer switches 
available in the market.
3) Handling Multicast packets needs quite a bit of 
configuration & proper designing.
4) At times swtiches when in Promiscuos mode is a opening 
for Security attacks [Spoofing ip address  or capturing 
Ethernet Frames using ethereal]

I would definitely arguee with the interviewer that 
switches are designed for what they are & there is no
disadvatage as such unless it is compared to other layer 
devices.At Layer 2 it does what other devices of layer 2 
cant do & it was initally meant to work at Layer 2,even 
though it works at multiple layers these days.