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  • Question
  • 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

  • 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.

  • More questions

    • 1. What is the purpose of flow control?

    • Options
    • A. To ensure that data is retransmitted if an acknowledgment is not received.
    • B. To reassemble segments in the correct order at the destination device.
    • C. To provide a means for the receiver to govern the amount of data sent by the sender.
    • D. To regulate the size of each segment.
    • Discuss
    • 2. Which three commands can be used to check LAN connectivity problems on a router?

      1. show interfaces
      2. show ip route
      3. tracert
      4. ping
      5. dns lookups

    • Options
    • A. 1 ,2 and 4
    • B. 2 and 5
    • C. 3 and 5
    • D. None of the above
    • Discuss
    • 3. Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

    • Options
    • A. Switch(config)# switchport trunk encapsulation isl
    • B. Switch(config)# switchport trunk encapsulation ietf
    • C. Switch(config)# switchport trunk encapsulation dot1q
    • D. Switch(config-if)# switchport trunk encapsulation isl
    • E. Switch(config-if)# switchport trunk encapsulation dot1q
    • Discuss
    • 4. To test the IP stack on your local host, which IP address would you ping?

    • Options
    • A. 127.0.0.0
    • B. 1.0.0.127
    • C. 127.0.0.1
    • D. 127.0.0.255
    • Discuss
    • 5. Which command is used to determine if an IP access list is enabled on a particular interface?

    • Options
    • A. show access-lists
    • B. show interface
    • C. show ip interface
    • D. show interface access-lists
    • 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 are true regarding OSPF areas?

      1. You must have separate loopback interfaces configured in each area.
      2. The numbers you can assign an area go up to 65,535.
      3. The backbone area is also called area 0.
      4. If your design is hierarchical, then you don't need multiple areas.
      5. All areas must connect to area 0.

    • Options
    • A. 1 only
    • B. 1 and 2 only
    • C. 3 and 4 only
    • D. 3, 4 and 5
    • Discuss
    • 8. Which command displays RIP routing updates?

    • Options
    • A. show ip route
    • B. debug ip rip
    • C. show protocols
    • D. debug ip route
    • Discuss
    • 9. What is the subnetwork address for a host with the IP address 200.10.5.68/28?

    • Options
    • A. 200.10.5.56
    • B. 200.10.5.32
    • C. 200.10.5.64
    • D. 200.10.5.0
    • Discuss
    • 10. 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


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