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Networking Questions And Answers Sample Test 6


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Networking Test 6


You have scored 3 out of 10
You Scored:2
Total Questions:2
Attended Questions:2
Correct Answered:2
1. To test the IP stack on your local host, which IP address would you ping?



Explanation:

To test the local stack on your host, ping the loopback interface of 127.0.0.1.


2. What are the decimal and hexadecimal equivalents for the binary number 10110111?



Explanation:

You must be able to take a binary number and convert it into both decimal and hexadecimal. To convert to decimal, just add up the 1s using their values. The values that are turned on with the binary number of 10110111 are 128 + 32 + 16 + 4 + 2 + 1 = 183. To get the hexadecimal equivalent, you need to break the eight binary digits into nibbles (4 bits), 1011 and 0111. By add- ing up these values, you get 11 and 7. In hexadecimal, 11 is B, so the answer is 0xB7.


3. What protocol is used to find the hardware address of a local device?



Explanation:

Address Resolution Protocol (ARP) is used to find the hardware address from a known IP address.


4. Which command will allow you to see real-time translations on your router?



Explanation:

The command debug ip nat will show you in real time the translations occurring on your router.


5.
You need to allow one host to be permitted to attach dynamically to each switch interface. Which two commands must you configure on your catalyst switch to meet this policy?

Switch(config-if)# ip access-group 10
Switch(config-if)# switchport port-security maximum 1
Switch(config)# access-list 10 permit ip host 1
Switch(config-if)# switchport port-security violation shutdown
Switch(config)# mac-address-table secure



Explanation:

The switchport port-security is an important command, and it's super easy with the CNA; however, from the CLI, you can set the maximum number of MAC addresses allowed into the port, and then set the penalty if this maximum has been passed.


6. The configuration register setting of 0x2102 provides what function to a router?



Explanation:

The default configuration setting of 0x2102 tells the router to look in NVRAM for the boot sequence.


7. On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?



Explanation:

A point-to-point link uses only two hosts. A /30, or 255.255.255.252, mask provides two hosts per subnet.


8.
Your switch has a port status LED that is alternating between green and amber. What could this indicate?



Explanation:

When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.


9. Which of the following is an example of a standard IP access list?



Explanation:

Standard IP access lists use the numbers 1-99 and 1300-1999 and filter based on source IP address only. Option C is incorrect because the mask must be in wildcard format.


10. What VTP mode allows you to change VLAN information on the switch?



Explanation:

Only in server mode can you change VTP information on a switch.


11. Which command will show you the summary of the NAT configuration?



Explanation:

The show ip nat statistics command displays a summary of the NAT configuration as well as counts of active translation types, hits to an existing mapping, misses (causing an attempt to create a mapping), and expired translations.


12.
You type the following command into the router and receive the following output:

Router#show serial 0/0
        ^
% Invalid input detected at '^' marker.
Why was this error message displayed?



Explanation:

You can view the interface statistics from user mode, but the command is show interface serial 0/0.


13.   How long is an IPv6 address



Explanation:

An IPv6 address is 128 bits long.


14. Which class of IP address provides a maximum of only 254 host addresses per network ID?



Explanation:

A Class C network address has only 8 bits for defining hosts: 28 - 2 = 254.


15. Two connected routers are configured with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?



Explanation:

When a routing update is received by a router, the router first checks the administrative distance (AD) and always chooses the route with the lowest AD. However, if two routes are received and they both have the same AD, then the router will choose the one route with the lowest metrics, or in RIP's case, hop count.


16.      What is route poisoning?



Explanation:

Another way to avoid problems caused by inconsistent updates and to stop network loops is route poisoning. When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable (sometimes referred to as infinite).


17.
 
If you wanted administrators to see a message when logging into the router, which command would you use?



Explanation:

The typical banner is a message of the day (MOTD) and is set by using the global configuration mode command banner motd.


18. What command is used to stop RIP routing updates from exiting out an interface but still allow the interface to receive RIP route updates?



Explanation:

The (config-router)#passive-interface command stops updates from being sent out an interface, but route updates are still received.


19. If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?



Explanation:

Since the source MAC address is not in the MAC address table, the switch will add the source address and the port it is connected to into the MAC address table and then forward the frame to the outgoing port.


20.
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?



Explanation:

Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device.


21.
You want to create a standard access list that denies the subnet of the following host: 172.16.50.172/20. Which of the following would you start your list with?



Explanation:

First, you must know that a /20 is 255.255.240.0, which is a block size of 16 in the third octet. Counting by 16s, this makes our subnet 48 in the third octet, and the wildcard for the third octet would be 15 since the wildcard is always one less than the block size.


22.
Which of the following types of connections can use full duplex?

Hub to hub
Switch to switch
Host to host
Switch to hub
Switch to hostwing types of connections can use full duplex?



Explanation:

Hubs cannot run full-duplex Ethernet. Full duplex must be used on a point-to-point connection between two devices capable of running full duplex. Switches and hosts can run full duplex between each other, but a hub can never run full duplex.


23.
Which of the following protocols are used to configure trunking on a switch?

VLAN Trunk Protocol
VLAN
802.1Q
ISL



Explanation:

Cisco has a proprietary trunking protocol called ISL. The IEEE version is 802.1Q.


24. You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?



Explanation:

If spanning tree is disabled on a switch and you have redundant links to another switch, broadcast storms will occur, among other possible problems.


25.      Which of the following is true regarding RIPv2?



Explanation:

RIPv2 is pretty much just like RIPv1. It has the same administrative distance and timers and is configured just like RIPv1.


26. You type debug ip rip on your router console and see that 172.16.10.0 is being advertised to you with a metric of 16. What does this mean?



Explanation:

You cannot have 16 hops on a RIP network by default. If you receive a route advertised with a metric of 16, this means it is inaccessible.


27.
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?



Explanation:

If the Spanning Tree Protocol is not running on your switches and you connect them together with redundant links, you will have broadcast storms and multiple frame copies.


28. What is the purpose of flow control?



Explanation:

Flow control allows the receiving device to control the transmitter so the receiving device's buffer does not overflow.


29.      What is split horizon?



Explanation:

A split horizon will not advertise a route back to the same router it learned the route from.


30.
   What does RIPv2 use to prevent routing loops?
CIDR
Split horizon
Authentication
Classless masking
Holddown timers



Explanation:

RIPv2 uses the same timers and loop-avoidance schemes as RIPv1. Split horizon is used to stop an update from being sent out the same interface it was received on. Holddown timers allow time for a network to become stable in the case of a flapping link.




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