CCNA – IP Address Questions
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?
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?
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.
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Question 10
I simulate it using Cisco packet tracer,It can work without no error.
But I think the desgin won’t function as intended,because there is no redundancy in desgin.
It the link between SW1 and SW2 is removed,the hosts in deifferent subnet on SW1 can’t communication with each anyother.
I rather than selected D
@9tut
What happened to the missing question 5 in CCNA – IP Questions page?
Aj
Hello 9tut
I have some querries about question 10. If the link between sw-1 and sw-2 is removed I think the network should work as intended; will it ??
Also if STP is running on the switches then will STP block the link between two switches? And if so why ?? Please help me out here. Thank you
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I have a question although it may be pretty obvious..what is the difference between sh ip route and traceroute? is it that one is from the command prompt and the other from the router?
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@darkread
Q10: I also simulated with Packet Tracer Version 5.3.1.0044. This is script from Router CLI:
Router(config-if)#int f0/0
Router(config-if)#ip address
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#no shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
Router(config-if)#int f0/1
Router(config-if)#ip address
Router(config-if)#ip address 192.168.1.2 255.255.255.0
% 192.168.1.0 overlaps with FastEthernet0/0
I think that given answer on Q10 is correct.
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Question 4
It’s also true that you should not allow the IP address of the the DHCP server and any staticly assigned IP addresses. They should be set up in an exclusion range so why are answers E and F not valid?
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Look at q 10 — notice what it is asking — or what it is that it wants you to know — the router ports need to be on separate nets — the router wont accept it (2 different ports in the network)
Q9
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
pls explain me how answer “D” is correct………………
@jahuta
imagine you have a small home network of 5 devices. you assign them 5 private IPs. all those 5 devices will use just 1 public IP (NAT overload) to access the internet. 5 devices, 1 public address. this way there are 4 public addresses saved.
imagine a corporation has 1000 computers, http/sql/mail servers, lan printers, etc., all requiring an IP address. those devices do not need to communicate anywhere else but inside the corporation. why waste 1000 public IPs when there can be used 1000 private IPs (on 10.0.0.0/8, 172.16.0.0/12 or 192.168.0.0/16).
the usage of private IPs and NAT overload is the reason why IPv4 is still usable nowadays even though there are millions and millions of interconnectable devices.
the replacement for IPv4 (32 bit addresses) is IPv6 (128 bit addresses). please read about it here: http://www.en.wikipedia.org/wiki/IPv6
Hi,
Can anybody explain question number 3 please?
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.
I chose B because you do need a router to connect to different networks of which the internet is one so I thought B covered E in its definition but the correct answer is E.
Thanks
@ironshiekh you are right about Q3. the correct answer is option E.
im hpy
@iron
Probably because you will not be using public ip addresses to interconnect a routers in your network,as you have to pay for them, only if you are ISP. You will be using private addresses, and only to get to the Internet you have to use public IP.
hi. could u explain q1. internet interface.