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CCNA – IP Address Questions

April 13th, 2011 Go to comments

Here you will find answers to IP Address Questions

Question 1

Which IP address can be assigned to an Internet interface?

A. 10.180.48.224
B. 9.255.255.10
C. 192.168.20.223
D. 172.16.200.18


Answer: B

Explanation

The IP address which can be assigned to an Internet interface is a public IP address. Private IP address are found in the following ranges:

* From 10.0.0.0 to 10.255.255.255
* From 172.16.0.0 to 172.31.255.255
* From 192.168.0.0 to 192.168.255.255

Also some special IP addresses (like the local loopback address 127.0.0.1, multicast addresses…) can’t be assigned to an Internet interface.

In this question only answer B doesn’t belong to the range of private IP address -> B is the correct answer.

Question 2

What will happen if a private IP address is assigned to a public interface connected to an ISP?

A. Addresses in a private range will be not routed on the Internet backbone.
B. Only the ISP router will have the capability to access the public network.
C. The NAT process will be used to translate this address in a valid IP address.
D. Several automated methods will be necessary on the private network.
E. A conflict of IP addresses happens, because other public routers can use the same range.


Answer: A

Question 3

When is it necessary to use a public IP address on a routing interface?

A. Connect a router on a local network.
B. Connect a router to another router.
C. Allow distribution of routes between networks.
D. Translate a private IP address.
E. Connect a network to the Internet.


Answer: E

Question 4

When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two)

A. network or subnetwork IP address
B. broadcast address on the network
C. IP address leased to the LAN
D. IP address used by the interfaces
E. manually assigned address to the clients
F. designated IP address to the DHCP server


Answer: A B

Explanation

Network or subnetwork IP address (for example 11.0.0.0/8 or 13.1.0.0/16) and broadcast address (for example 23.2.1.255/24) should never be assignable to hosts. When try to assign these addresses to hosts, you will receive an error message saying that they can’t be assignable.

Question 6

The network administrator has asked you to check the status of the workstation’s IP stack by pinging the loopback address. Which address would you ping to perform this task?

A. 10.1.1.1
B. 127.0.0.1
C. 192.168.0.1
D. 239.1.1.1


Answer: B

Explanation

The IP address of 127.0.0.1 is the well-known loopback IP address on a computer. When try pinging this address, you are testing if the TCP/IP stack is working or not.

Question 7

Which command is used to see the path taken by packets across an IP network?

A. show ip route
B. show route
C. traceroute
D. trace ip route


Answer: C

Explanation

Notice that “traceroute” is the command used on a Cisco router while the “tracert” is the command used in MSDOS of Windows. They have the same purpose of finding the path that packets use to reach a destination network.

Question 8

Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection?

IP_default_gateway.jpg

A. 10.0.0.0
B. 10.0.0.254
C. 192.223.129.0
D. 192.223.129.254


Answer: B

Explanation

The default gateway IP address must be on the same network with the configured host’s IP address and not is the network or broadcast address -> B is correct.

Question 9

Which of the following describe private IP addresses? (Choose two)

A. addresses chosen by a company to communicate with the Internet
B. addresses that cannot be routed through the public Internet
C. addresses that can be routed through the public Internet
D. a scheme to conserve public addresses
E. addresses licensed to enterprises or ISPs by an Internet registry organization


Answer: B D

Question 10

Refer to the exhibit. A network technician is asked to design a small network with redundancy. The exhibit represents this design, with all hosts configured in the same VLAN. What conclusions can be made about this design?

IP_Address_wrong_assignment.jpg

A. The design will function as intended
B. Spanning-tree will need to be used.
C. The router will not accept the addressing scheme.
D. The connection between switches should be a trunk.
E. The router interfaces must be encapsulated with the 802.1Q protocol.


Answer: C

Explanation

Each interface on a router must be in a different network. If two interfaces are in the same network, the router will not accept it and show error when the administrator assigns it.

Comments (320) Comments
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  1. jacsatx
    August 29th, 2012

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    September 6th, 2012

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    September 10th, 2012

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  4. Lamin K L Dibba
    September 10th, 2012

    Its really very important to understand the difference between private and public address and what they does, i have learn a lot here. Thanks! but am interested in the commands. Here is my email: kldibba@yahoo.com

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    September 17th, 2012

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  6. HT
    September 17th, 2012

    @ ropam

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  7. sunil
    September 20th, 2012

    @ropam

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    October 26th, 2012

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  16. test
    October 26th, 2012

    for question 4 why don’t you have E and F for your answer?

    You’ll get duplicate IPs if you don’t exclude the DHCP server and manually assigned addresses. The verb used is should implying a choice. If broacasts and network addresses are excluding by code, then you should exclude manually assigned IPs and the DHCP server’s IP.

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  34. jay
    December 30th, 2012

    Can u explain me in que 2,why ans C is not correct?

  35. trytounderstand
    January 6th, 2013

    Hello, can someone pliz explain to me what is a Vritual IP and what is it used for and how is it different from the IP address. thank you

  36. Andy
    January 7th, 2013

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  37. Chanana
    January 8th, 2013

    @ trytounderstand: Is an ip that is in your heart :).
    @Jay :
    Question 2

    What will happen if a private IP address is assigned to a public interface connected to an ISP?

    A. Addresses in a private range will be not routed on the Internet backbone.
    B. Only the ISP router will have the capability to access the public network.
    C. The NAT process will be used to translate this address in a valid IP address.
    D. Several automated methods will be necessary on the private network.
    E. A conflict of IP addresses happens, because other public routers can use the same range.

    A- Well this is the way to go since rules say that private Ip’s are not routed trough internet.
    C- Is not correct beacuse first, we are asuming that the scenario is just the one in the question, they dont mention anything about NAT, if there were a mention of nat (overload for this case) then “C” is the way to Go. Also consider this

    <>—-[Switch]—–(e0)(RouterA)(s/0)—————————-(s/1)(ISP)

    Imagine that in S0 there is a private address, the nat process will translate those ip’s that are in the inside network, we only apply nat process in the frontier routers in this case (RouterA), and the comand in s0 will be “nat ouside”,and in e0 will be “nat inside”.

    So bottom line, the answer itself its absurd, i hope this shed some light on your question.

  38. Chanana
    January 8th, 2013

    Oh i forgot to clarify, if we use a private address on s0, we will totally defeat the purpouse of using nat, because we are entering in the public addressing realm.

  39. Tharanee
    January 13th, 2013

    i’m going to take CCNA exam in one week.. can anybody send the latest dumps to me…
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  40. Renolph
    January 14th, 2013

    Guys,I dont realy understand question 10, can anyone please explain to me!!

  41. Shafie
    January 17th, 2013

    @Renolph.. Look at the Router. It has 2 (two) interfaces. Both are configured with IP addresses 192.168.1.1/24 and 192.168.1.2/24. NOW both these addresses are in the same range (same subnet 192.168.1.0/24). YOU CANNOT HAVE BOTH INTEFACES in the same range or subnet. Meaning all the interfaces on any router should have seperate or different Subnets. If one of the interfaces had IP address, like 192.168.2.1 or 3.1 or 4.1, then it would work.. Makes Sense ?

  42. CP
    January 19th, 2013

    Took the CCNA today and failed 815/825. 33% in IP addressing

  43. Renolph
    January 21st, 2013

    CP what is the passing score for CCNA?

  44. Pijush
    January 22nd, 2013

    Question 4
    Explanation!

    some of you are confused about the answer! why A and B why not D and F?
    Option D say: ip address of of the interface, question is what and who’s interface? it might be the interface of Router of that Broadcast domain(typically lan or Vlan) or the the interface of DHCP server(it is not possible, coz option F say saying the same thing). but as we know DHCP PINGs that address before assign that to a host, so if that is that interface ip of DHCP or Router , it will reply ping request. By which DHCP server understand those address are in use! SO OPTION “D” WRONG and so of it OPTION “F”

    WHY OPTION A and B Correct!
    As we know DHCP pings a address before assigning to host! if DHCP received any response from that ip , it won’t b assigned to that host. here trouble begin! if that is broadcast address or network or sub-network(typically summarized environment) address , DHCP won’t receive any reply of that ping! (Theoretically) DHCP server may apply those address to DHCP clients, what is illegal! SO OPTION A and B Correct!

    Correct me, if i’m Wrong! Thanking You All!

  45. Anonymous
    January 22nd, 2013

    jalliiiiiiii… questions………….. :p

  46. Raju
    January 22nd, 2013

    Please send me the latest dumps to rajdhanu2@gmail.com..I am going to write my exam in FEB 20.

  47. CP
    January 22nd, 2013

    @Pijush, passing score is 825.

  48. Pijush
    January 23rd, 2013

    @CP
    So?

  49. tt
    January 31st, 2013

    cp , where do u think i can focus on the exam

  50. Rooki3
    January 31st, 2013

    Valid Que :D

    Q:10

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