What is the difference between a standard ACL and an extended ACL?

Asked By: Denislav Dacosta | Last Updated: 1st May, 2020
Category: technology and computing computer networking
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Difference between standard access list and extended access list. Allow filtering based on source address. Extended ACL is implemented closet to the source. Standard ACL Range–> 1 – 99 & 1300- 1999.

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Consequently, which type of ACL is better standard or extended?

It's the letter S, it is a great way to remember that standard access lists only look for source. Extended access control lists, or extended ACLs, on the other hand, they're far more powerful, they can look at source and destination, they can look at transport layer protocols such as TCP and User Data Protocol, or UDP.

Furthermore, what is an extended ACL? Extended Access Control Lists (ACLs) allow you to permit or deny traffic from specific IP addresses to a specific destination IP address and port. It also allows you to specify different types of traffic such as ICMP, TCP, UDP, etc.

Correspondingly, which benefit does an extended ACL offer over a standard ACL?

Extended ACLs can be named, but standard ACLs cannot. Unlike standard ACLs, extended ACLS can be applied in the inbound or outbound direction. Based on payload content, an extended ACL can filter packets, such as information in an e-mail or instant message.

What is a standard ACL?

A standard ACL can permit or deny trafiic based only on the source address(s). An extended ACL can permit or deny traffic based on both the source and destination address(s) as well as tcp/udp/icmp trafic types.

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Where do I put the standard access list?

Standard Access Control List (ACL) filters the traffic based on source IP address. Therefore a Standard Access Control List (ACL) must be placed on the router which is near to the destination network/host where it is denied.

What are the types of access control lists?

There are two main different types of Access-list namely:
  • Standard Access-list – These are the Access-list which are made using the source IP address only. These ACLs permit or deny the entire protocol suite.
  • Extended Access-list – These are the ACL which uses both source and destination IP address.

How many types of ACL are there?

There are several types of access control lists and most are defined for a distinct purpose or protocol. On Cisco routers, there are two main types: standard and extended. These two types are the most widely used ACLs and the ones I will focus on in this and future articles, but there are some advanced ACLs as well.

What is ACL firewall?

Access Control Lists (ACLs) are a collection of permit and deny conditions, called rules, that provide security by blocking unauthorized users and allowing authorized users to access specific resources. Normally ACLs reside in a firewall router or in a router connecting two internal networks.

What are the benefits of using named ACLs over numbered?


What is the benefit of using named IPv4 ACLs over numbered IPv4 ACLs?
  • You can permit or deny traffic.
  • You can create extended ACLs.
  • There is an implicit deny all entry in every ACL.
  • You can add, delete, and modify entries in a named ACL.

How does ACL help protect data that passes through a router?

ACLs are a network filter utilized by routers and some switches to permit and restrict data flows into and out of network interfaces. ACLs are also used to restrict updates for routing from network peers and can be instrumental in defining flow control for network traffic.

Where do you put an extended ACL?

Extended ACL "Should be placed closest to the source network." because it filter base on much more specific criteria such as source, destination ip address, protocol and port number.

Which three parameters can ACL use to filter traffic?

The criteria used by the router to determine whether packets can traverse the network is made by configuring ACLs. With access control lists, we can filter traffic based on; destination and source layer 3 address, destination and source port number, as well as the protocol in use.

What is the purpose of a standard access list?

Standard Access-List. Access-list (ACL) is a set of rules defined for controlling the network traffic and reducing network attacks. ACLs are used to filter traffic based on the set of rules defined for the incoming or out going of the network. These are the Access-list which are made using the source IP address only.

What is the only type of ACL available for IPv6?


What is the only type of ACL available for IPv6? Unlike IPv4, IPv6 has only one type of access list and that is the named extended access list.

What are the ranges for extended ACLs?

It is even possible with an extended ACL to define what protocol that is being permitted or denied. As with standard ACLs, there is a specific number range that is used to specify an extended access list; this range is from 100-199 and 2000-2699.

What is an ACL rule?

ACL Rule. ACLs are a collection of permit and deny conditions, called rules, that provide security by blocking unauthorized users and allowing authorized users to access specific resources. ACLs can block any unwarranted attempts to reach network resources.

What is standard extended ACL?

A “StandardACL allows you to prioritize traffic by the Source IP address. An “ExtendedACL provides greater control over what traffic is prioritized. Extended ACLs can use any or all of the following parameters: Destination IP address. TCP/UDP Source port.

How do I know if my IP address is private?

Any IP address that falls into this range is private IP and others are public.
  1. 192.168.0.0 - 192.168.255.255 (65,536 IP addresses)
  2. 172.16.0.0 - 172.31.255.255 (1,048,576 IP addresses)
  3. 10.0.0.0 - 10.255.255.255 (16,777,216 IP addresses)

What does fa0 0 mean?


to Serial port not. the digits 0/0/0 means the number of "module/submodule/port" number, when you are logged on a real equipment there could be a different numbering depending of type of router. That is you have first module, first submodule, first Serial or Fast ethernet port of router.

How does Cisco Show ACL?

To display all IPv4 access control lists (ACLs) or a specific IPv4 ACL, use the show ip access-lists command.

What is a dynamic ACL?

A dynamic ACL is an ACL that is created on and stored in an LDAP, RADIUS, or Active Directory server. A Dynamic ACL action dynamically creates ACLs based on attributes from the AAA server. Because a dynamic ACL is associated with a user directory, this action can assign ACLs specifically per the user session.