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i know that command

access-list 10 permit 192.168.3.0 0.0.0.255

This list allows traffic from all addresses in the range 192.168.3.0 to 192.168.3.255 but i have question why we need 10?

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The 10 is denoting which number the access-list is - it is identifying it. So if you have different ACLs that you want to apply to different interfaces, you would give them different numbers to differentiate them. When you apply the ACL to an interface, you tell the router that you want to apply ACL #10 to this interface.

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The 10 also identifies it as an IP standard acl (between 1 and 99). –  murisonc Nov 29 '10 at 14:23
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