Answer / gaurav kumar sharma

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.

Answer / shahin

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

Answer / sachin

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.

Answer / harsh singh

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

Answer / manoranjan

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)

Answer / shahin

Mr. Diwakar... Nice question...

As we know, Extended ACL is basically used to block
particular services like telnet. ftp, tftp, ICMP echo etc.....

Now if we apply it near to destination, then data will flow
all the way to destination.. thn on particular interface on
the destination it'll droped.

So my question for you.... if u want to block particular
services then why u r letting data traffic to go near to
destination n thn droped?????


It may unnecessary using network bandwidth. Which is waste
as far as my concern. Hope it helps u to clear your doubts.

Cheers

Shahin

Answer / naveen kumar sharma

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.

Answer / awanish kumar sharma

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.

Answer / nizam

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.

Answer / raju

1)Standard access list ranges from 1-99 and extended access
list ranges from 100-199,
2) Standard access list filter the packet based on
perticular source Ip or Network address,where it comes
From,,Ex,,,,,if i put Permit or Deny host 172.23.152.200
or 172.23.152.0 it will blocks or allows(As per Deny or
Permit statement) all the packets which comes from the
perticular Ip address or Network Address completly
Extended Access list can do some extraa activity like
permit or deny on basis of protocols,Packet types like
ICMP,UDP,TCP,,,,,,,,RIP,,,,,,,,,,,,,,,,


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