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Q:

What command would you use to set an access list on a VTY line?

Answer

line vty 0 4


access - class 110 in 

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Subject: CCNA

Q:

What command would you use to create an extended access list that stops host 172.16.10.1 fro telnetting to host 172.16.30.5?

Answer

access - list 110 deny tcp host


172.16.10.1  host  172.16.30.5  eq  23


access - list 110 permit ip any any

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Subject: CCNA

Q:

You need to stop DoS attacks in real time and have a log of anyone who has tried to attack your network. What should you do your network?

A) Add more routers B) Use the auto secure command
C) Implement IDS/IPS D) Configure Naggle
 
Answer & Explanation Answer: C) Implement IDS/IPS

Explanation:

Implementing Intrusion Detection Service and Intrusion prevention Service (IDS/IPS) will help notify you and stop attacks in real time.

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Q:

What is the most common attack on a network today?

A) Lock picking B) Naggle
C) DoS D) auto secure
 
Answer & Explanation Answer: C) DoS

Explanation:

The most common attack on a network today is a denial of service (DoS) because they are the easiest attack to achieve.

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Q:

What command will permit SMTP mail to only host 1.1.1.1?

A) access-list 10 permit smtp host 1.1.1.1 B) access-list 110 permit ip smtp host 1.1.1.1
C) access-list 10 permit tcp any host 1.1.1.1 eq smtp D) access-list 110 permit tcp any host 1.1.1.1 eq smtp
 
Answer & Explanation Answer: D) access-list 110 permit tcp any host 1.1.1.1 eq smtp

Explanation:

when trying to find the best answer to an access - list question, always check the access - list bnumber 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 the port of an upper - layer protocol, you must use either tcp or udp in the ACL protocol field. If it says ip in the protocol field, you cannot filoter on the port number of an upper - layer protocol. SMTP uses TCP

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Q:

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

A) ip access - list 101 out B) acces - list ip 101 in
C) ip access - group 101 in D) access - group ip 101 in
 
Answer & Explanation Answer: C) ip access - group 101 in

Explanation:

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

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Q:

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

A) show ip port B) show access - lists
C) show ip interface D) show access - lists interface
 
Answer & Explanation Answer: C) show ip interface

Explanation:

Of the available choices 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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Q:

You need to create an access list that will prevent hosts in the network range of 192.168.160.0 to 192.168.191.0 . Which of the following lists will you use?

A) access - list 10 deny 192.168.160.0 255.255.224.0 B) access - list 10 deny 192.168.160.0 0.0.191.255
C) access - list 10 deny 192.168.160.0 0.0.31.255 D) access - list 10 deny 192.168.0.0 0.0.31.255
 
Answer & Explanation Answer: C) access - list 10 deny 192.168.160.0 0.0.31.255

Explanation:

The range of 192.168.160.0 to 192.168.191.0 is a block size of 32. The network address is 192.168.160.0 and the mask would be 255.255.224.0, which for an access list must be a wildcard format of 0.0.31.255 . The 31 is used for a block size of 32. The wildcard is always one less than the block size.

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Filed Under: CCNA