standard IP access list provides basic packet filtering 
abilities, based on the source IP address of a packet only. 
As a general rule, apply standard IP access lists close to 
the destination network to which you wish to permit or deny 
access.Standard IP access lists fall into the numerical 
range 1-99
Unlike standard IP access lists (which only allow you to 
filter packets based on their source IP address), extended 
IP access lists allow a much more granular level of 
control. Extended IP access lists allow filtering not only 
on source addresses, but also on destination addresses, 
protocols, and even applications, based on their port 
number. For example, you might choose to permit or deny a 
group of hosts from accessing a particular server, limit 
access to a telnet server to only a single host, or 
similar.Extended IP access lists are identified through 
their use of the 100-199 numerical range.

In standard access-list the range area is 0-99 but in case 
of extended access-list the range area is 100-199 and in 
standard access-list we cannot create permission on 
specific protocol like bloking the telnet or ftp......we 
can do that in extended access-list.

In standard access-list  we can filter the packet after
routing.and it will applied on destination router.its depend
only on source ip address.


but in case of extended access list we can filter the packet
before routing,and it will applied on source router,its
depend on source ip,destination ip,port and protocol.

standard access list has range area of 0-99
extended has 100-199.

Standard access list basically used to filter packets by IP
address & is basically close to the destination router.(1-99)

Extended access list is used to filter packets based on
address ,protocol & port no. dedicated for particular
services.(100-199)

Standared IP access list is based on IP address.Apply close 
to the destination that can only filter packet based on 
there source IP address.Numeric value from 1-99,1300-1399
Extended IP access list is based on Port address.Apply 
close to source that can filter not only source address but 
also destination address based on there port number.Numeric 
value from 100-199.Allow more grangular level of controle.

When you enable standard access-list it will block entire 
thing but extended access-list can block every port like 
ftp,telnet etc.
Standard range is 1-99 and extended range is 100-199.

Difference between Standard ACL & Extended ACL - 

a) In Standard ACL, filtering is based on source IP address.
where as in extended ACL, filtering is bases on Source IP
address, Destination IP address, Protocol Type, Source Port
Number & Destination Port Number.

b) Standard ACL are used to block particular host or sub
network. where as Extended ACL is used to block particular
services.

c)Standard ACL is implemented as possible closer to
destination. where as Extended ACL is implemented as
possible closer to source.

d) Standard ACL is created from 1 - 99 & extended range 1300
- 1999. where as Extended ACL is created from 100 - 199 &
extended range 2000 - 2699.

e) In Standard ACL, two communication will be blocked, where
as in Extended ACL, one way communication will be blocked.

f) In Standard ACL, all services will be blocked. Where as
in Extended ACL, particular services wil be blocked.


Hope this much of difference will help u guys. Keep posting
new question plzzzz....!!!

Thanking you
Shahin