CCNA- Access Control List -Part-1

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Access Control List

What is Access control list?

Access control list is to filter traffic on entering & out from interface through router. It can be outbound & inbound.

What is outbound and inbound traffic?

Inbound: As traffic comes into an interface.

Inbound ACL:Incoming packets are processed before they route to an outbound interface.

Outbound: Before traffic leaves an interface.

Outbound ACL:Incoming packets are  route to the outbound interface then processed.

Any interface can be act as inbound & outbound interface based on traffic comes from & out.

There are generally two types of Access list -a) Standard b) Extended. Another access list also present name as Named access list.

Standard Access list: Filter traffic based on source traffic & permit or deny entire protocol suite.

Extended Access list: Check both source & destination traffic can check specific protocols & port numbers.

Access Control List-Extended

Standard ACL Example-1: Block host 10.0.0.3 from gaining access on network 40.0.0.0.

Here routerB is Router1 in above example.

ex-1

now check from  pc-10.0.0.3  that you can access 40.0.0.0 network or not.

Thanks………check next part for examples…..

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Former Asst. Manager (IT) - MGH Group MCA (Masters in Computer Application) From Sikkim Manipal University India. Have 5 years experience In IT field.

4 Comments

  1. Avatar
    Raju Chakraborty on

    There are lot more way to filter traffic. i will post one by one… which will help you to understand ACL.

  2. Avatar
    sorfuddin ahmad on

    ACL is necessary topics in ccna course & so thanks for your post bcz we get lear from your post

  3. Avatar

    I DONE CCNA STUDY..BUT I WANT GET MORE IDEA ABOUT CNNA…SO I MUST SAY THANKS FOR IDEA N IT IS HELPFUL FOR CCNA LEARNER

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