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- Question
Which of the following is true regarding access lists applied to an interface?
Options- A. You can place as many access lists as you want on any interface until you run out of memory.
- B. You can apply only one access list on any interface.
- C. One access list may be configured, per direction, for each layer 3 protocol configured on an interface.
- D. You can apply two access lists to any interface.
- Correct Answer
- One access list may be configured, per direction, for each layer 3 protocol configured on an interface.
ExplanationA Cisco router has rules regarding the placement of access lists on a router interface. You can place one access list per direction for each layer 3 protocol configured on an interface. - 1. Which router command allows you to view the entire contents of all access lists?
Options- A. Router# show interface
- B. Router> show ip interface
- C. Router# show access-lists
- D. Router> show all access-lists Discuss
- 2. If you wanted to deny FTP access from network 200.200.10.0 to network 200.199.11.0 but allow everything else, which of the following command strings is valid?
Options- A. access-list 110 deny 200.200.10.0 to network 200.199.11.0 eq ftp
access-list 111 permit ip any 0.0.0.0 255.255.255.255 - B. access-list 1 deny ftp 200.200.10.0 200.199.11.0 any any
- C. access-list 100 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftp
- D. access-list 198 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftp
access-list 198 permit ip any 0.0.0.0 255.255.255.255
Discuss
- 3. What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?
Options- A. Forwards the switch to the first available link
- B. Drops the frame
- C. Floods the network with the frame looking for the device
- D. Sends back a message to the originating station asking for a name resolution Discuss
- 4. If you want to disable STP on a port connected to a server, which command would you use?
Options- A. disable spanning-tree
- B. spanning-tree off
- C. spanning-tree security
- D. spanning-tree portfast Discuss
- 5. Your switch has a port status LED that is alternating between green and amber. What could this indicate?
Options- A. The port is experiencing errors.
- B. The port is shut down.
- C. The port is in STP blocking mode.
- D. Nothing; this is normal. Discuss
- 6. Which command would you use to apply an access list to a router interface?
Options- A. ip access-list 101 out
- B. access-list ip 101 in
- C. ip access-group 101 in
- D. access-group ip 101 in Discuss
- 7. Which of the following is an example of a standard IP access list?
Options- A. access-list 110 permit host 1.1.1.1
- B. access-list 1 deny 172.16.10.1 0.0.0.0
- C. access-list 1 permit 172.16.10.1 255.255.0.0
- D. access-list standard 1.1.1.1 Discuss
- 8. What command will permit SMTP mail to only host 1.1.1.1?
Options- 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 Discuss
- 9. You configure the following access list:
What will the result of this access list be?access-list 110 deny tcp 10.1.1.128 0.0.0.63 any eq smtp access-list 110 deny tcp any eq 23 int ethernet 0 ip access-group 110 out
Options- A. Email and Telnet will be allowed out E0.
- B. Email and Telnet will be allowed in E0.
- C. Everything but email and Telnet will be allowed out E0.
- D. No IP traffic will be allowed out E0. Discuss
- 10. If you wanted to deny all Telnet connections to only network 192.168.10.0, which command could you use?
Options- A. access-list 100 deny tcp 192.168.10.0 255.255.255.0 eq telnet
- B. access-list 100 deny tcp 192.168.10.0 0.255.255.255 eq telnet
- C. access-list 100 deny tcp any 192.168.10.0 0.0.0.255 eq 23
- D. access-list 100 deny 192.168.10.0 0.0.0.255 any eq 23 Discuss
Security problems
Search Results
Correct Answer: Router# show access-lists
Explanation:
The
show access-lists command will allow you to view the entire contents of all access lists, but it will not show you the interfaces to which the access lists are applied.
Correct Answer: access-list 198 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftp
access-list 198 permit ip any 0.0.0.0 255.255.255.255
Explanation:
Extended IP access lists use numbers 100-199 and 2000-2699 and filter based on source and destination IP address, protocol number, and port number. The last option is correct because of the second line that specifies permit ip any any. (I used 0.0.0.0 255.255.255.255, which is the same as the any option.) The third option does not have this, so it would deny access but not allow everything else.
Correct Answer: Floods the network with the frame looking for the device
Explanation:
Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device.
Correct Answer: spanning-tree portfast
Explanation:
If you have a server or other devices connected into your switch that you're totally sure won't create a switching loop if STP is disabled, you can use something called
portfast on these ports. Using it means the port won't spend the usual 50 seconds to come up while STP is converging.
Correct Answer: The port is experiencing errors.
Explanation:
When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.
Correct Answer: ip access-group 101 in
Explanation:
To apply an access list, the proper command is
ip access-group 101 in.
Correct Answer: access-list 1 deny 172.16.10.1 0.0.0.0
Explanation:
Standard IP access lists use the numbers 1-99 and 1300-1999 and filter based on source IP address only. Option C is incorrect because the mask must be in wildcard format.
Correct Answer: 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 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.
Correct Answer: No IP traffic will be allowed out E0.
Explanation:
If you add an access list to an interface and you do not have at least one
permit statement, then you will effectively shut down the interface because of the implicit
deny any at the end of every list.
Correct Answer: access-list 100 deny tcp any 192.168.10.0 0.0.0.255 eq 23
Explanation:
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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