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1.

What command will permit SMTP mail to only host 1.1.1.1?

Answer» When trying to find the best answer to an access-list question, always check the access-list number and then the protocol. When filtering to an upper-layer protocol, you must use an extended list, numbers 100-199 and 2000-2699. Also, when you filter to an upper-layer protocol, you must use either tcp or udp in the protocol field. If it says ip in the protocol field, you cannot filter to an upper-layer protocol. SMTP uses TCP.
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2.

Which command would you use to apply an access list to a router interface?

Answer» To apply an access list, the proper command is ip access-group 101 in.
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3.

You are working on a router that has established privilege levels that restrict access to certain functions. You discover that you are not able to execute the command . How can you view and confirm the access lists that have been applied to the Ethernet 0 interface on your router?

Answer» The only command that shows which access lists have been applied to an interface is show ip interface Ethernet 0. The command show access-lists displays all configured access lists, and show ip access-lists displays all configured IP access lists, but neither command indicates whether the displayed access lists have been applied to an interface.
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4.

What router command allows you to determine whether an IP access list is enabled on a particular interface?

Answer» Only the show ip interface command will tell you which interfaces have access lists applied. show access-lists will not show you which interfaces have an access list applied.
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5.

If you wanted to deny all Telnet connections to only network 192.168.10.0, which command could you use?

Answer» The extended access list ranges are 100-199 and 2000-2699, so the access-list number of 100 is valid. Telnet uses TCP, so the protocol TCP is valid. Now you just need to look for the source and destination address. Only the third option has the correct sequence of parameters. Answer B may work, but the question specifically states "only" to network 192.168.10.0, and the wildcard in answer B is too broad.
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