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  • Digg it UP - Cisco CCNA Certification Exam Tutorial: Access List Details You Must Know!

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    mask of 255.255.255.255 means that all addresses will match the line.

    Wildcard masks have the option of using the word h

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    To pass the CCNA exam, you have to be able to write and troubleshoot access lists. As you climb the ladder toward the CCNP and CCIE, you'll see more and more uses for ACLs. Therefore, you had better know the basics!

    The use of "host" and "any" confuses some newcomers to ACLs, so let's take a look at that first.

    It is acceptable to configure a wildcard mask of all ones or all zeroes. A wildcard mask of 0.0.0.0 means the address specified in the ACL line must be matched exactly a wildcard mask of 255.255.255.255 means that all addresses will match the line.

    Wildcard masks have the option of using the word ho

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    CCIE, you'll see more and more uses for ACLs. Therefore, you had better know the basics!

    The use of "host" and "any" confuses some newcomers to ACLs, so let's take a look at that first.

    It is acceptable to configure a wildcard mask of all ones or all zeroes. A wildcard mask of 0.0.0.0 means the address specified in the ACL line must be matched exactly a wildcard mask of 255.255.255.255 means that all addresses will match the line.

    Wildcard masks have the option of using the word h

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    nfuses some newcomers to ACLs, so let's take a look at that first.

    It is acceptable to configure a wildcard mask of all ones or all zeroes. A wildcard mask of 0.0.0.0 means the address specified in the ACL line must be matched exactly a wildcard mask of 255.255.255.255 means that all addresses will match the line.

    Wildcard masks have the option of using the word h

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    ones or all zeroes. A wildcard mask of 0.0.0.0 means the address specified in the ACL line must be matched exactly a wildcard mask of 255.255.255.255 means that all addresses will match the line.

    Wildcard masks have the option of using the word h

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    mask of 255.255.255.255 means that all addresses will match the line.

    Wildcard masks have the option of using the word host to represent a wildcard mask of 0.0.0.0. Consider a configuration where only packets from IP source 10.1.1.1 should be allowed and all other packets denied. The following ACLs both do that.

    R3#conf t

    R3(config)#access-list 6 permit 10.1.1.1 0.0.0.0

    R3(config)#conf t

    R3(config)#access-list 7 permit host 10.1.1.1

    The keyword any can be used to represent a wildcard mask of 255.255.255.255.

    R3(config)#access-list 15 permit any

    Another often overlooked detail

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