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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.
 
 
Instruction:
 
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.
 
orbitco-ccna-pastquestions.com 
 
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 - 192.168.10.15
B -192.168.10.31
C -192.168.10.63
D - 192.168.10.127
E - 255.255.255.255



Answer: A

Explanation:

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:
 
orbitco-CCNA-pastquestions.com
 
 

From the output you can see that the IP address of the FastEthernet0/0 interface of Router1 is 192.168.10.1 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: 192.168.10.0
Broadcast address: 192.168.10.15 (15 = 0 + 16 -1)

So, The broadcast address for this subnet is 192.168.10.15

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

Explanation:

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
 

Explanation:

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:

orbitco-CCNA
 

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

Explanation:

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 10.11.12.13255.255.255.252
F - Router1(conf)# interface s0/1
      Routerl (conf-if)# ip address 10.11.12.13255.255.255.252

Answer: C

Explanation:

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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