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ICND 1 Routing and Troubleshooting Question.

This is an Updated real CCNA exam question (June 2012). You might see a different IP addressing,  Port allocation and Configurations.

As usual, take time to read through the question so as to clearly understand what Cisco want you to do.

 Note: This troubleshooting Lab are used for demonstration only; you might see different IP addressing and Port allocation in the real CCNA exam. But it all works the same way if you could understand the technique.
This task requires the use of various show commands from the CLI of Router1to answer 5 multiple-choice questions. This does not require any configuration.
NOTE: The show running-configuration and the show startup-configuration commands have been disabled in this simulation.
To access the multiple-choice questions, click on the numbered boxes on the right of the top panel.

There are 5 multiple-choice questions with this task. Be sure to answer all 5 questions before leaving this item.

Question 1:

What is the subnet broadcast address of the LAN connected to Router1?

A -
B -
C -
D -
E -

Answer: A


According to the information above, the "show running-configuration" and "show startup-configuration" have been disabled. To view IP configuration of the LAN network connected to Router1, you can use the show ip interface command . Below is a copy of the command output:

From the output you can see that the IP address of the FastEthernet0/0 interface of Router1 is and the subnet mask is /28.

Remember this table?


If you follow the table, the increment is in 16s which is /28 or 240 mask.
Network address:
Broadcast address: (15 = 0 + 16 -1)

So, The broadcast address for this subnet is

Question 2:

What is the bandwidth on the WAN interface of Router1?

A - 16 Kbit/sec
B - 32 Kbit/sec
C - 64 Kbit/sec
D - 128 Kbit/sec
E - 512 Kbit/sec
F - 1544 Kbit/sec

Answer: E


On this occasion, use the show interfaces serial 0/0 command to verify the bandwidth on the serial interface of Router1. Below is a copy of the output:

The bandwidth on the WAN is 512 Kbit/sec.

 Question 3:

What interfaces on Router1 have not had any configurations applied? (Choosetwo)

A - Ethernet 0
B - FastEthenet 0/0
C - FastEthernet 0/1
D - Serial 0
E - Serial 0/0
F - Serial 0/1

Answer: C F


Use the show ip interface brief command to verify what interfaces on Router 1 were configured with IP addresses.  Below is a copy of the output:


You will discover that the Router1  have no Ethernet 0 and  Serial 0 interfaces.

Router1 have only FastEthernet 0/0 and Serial 0/0  configured with  IP addresses.

  FastEthernet 0/1 and Serial0/1 interfaces were not configured with IP addresses.

Question 4:

Including the address on the Router1 FastEthernet interface, how many host scan have IP addresses on the LAN to which Router1 is connected?

A - 6
B - 14
C - 62
D - 128

Answer: B


Looking at the subnet mask of the interface Fa0/0 of Router1 which is /28 . That means, this subnet will only provide for 16 -2 = 14 host or assignable IP addresses for hosts on the LAN.

If you are confused, I recommend you read VLSM

Question 5:

The hosts in the LAN are not able to connect to the Internet. Which commands will correct this issue?

A - Router1(conf)# interface fa0/0
      Router1(conf-if)# no shutdown
B - Routed (conf)# interface fa0/1
      Router1(conf-if)# no shutdown
C - Router1(conf)# interface s0/0
      Router1(conf-if)# no shutdown
D - Router1(conf)# interface s0/1
      Router1(conf-if)# no shutdown
E - Router1(conf)# interface s0/0
      Router1(conf-if)# ip address
F - Router1(conf)# interface s0/1
      Routerl (conf-if)# ip address

Answer: C


You can use the show ip interface brief command to verify the status of all the interfaces on Router1. Below is a copy of the output :


Study the detail of the ouput above carefully, you will discorver that the Serial0/0 interface which connects to ISP router is in "administratively down" status . This means not transmitting, its in a shutdown state.

So you enable the interface with a no shutdown command:

 C - Router1(conf)# interface s0/0
      Router1(conf-if)# no shutdown


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