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Networking Questions And Answers Sample Test 7


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Networking Test 7


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You Scored:2
Total Questions:2
Attended Questions:2
Correct Answered:2
1. 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.


2.
Which three commands can be used to check LAN connectivity problems on a router?

show interfaces
show ip route
tracert
ping
dns lookups



Explanation:

The tracert command is a Windows command and will not work on a router! A router uses the traceroute command.


3. Which of the following are benefits of VLANs?
They increase the size of collision domains.
They allow logical grouping of users by function.
They can enhance network security.
They increase the size of broadcast domains while decreasing the number of collision domains.
They simplify switch administration.
They increase the number of broadcast domains while decreasing the size of the broadcast domains.



Explanation:

VLANs break up broadcast domains in a switched layer 2 network, which means smaller broadcast domains. They allow configuration by logical function instead of physical location and can create some security if configured correctly.


4. Which command will show you whether a DTE or a DCE cable is plugged into serial 0?



Explanation:

The show controllers serial 0 command will show you whether either a DTE or DCE cable is connected to the interface. If it is a DCE connection, you need to add clocking with the clock rate command.


5.
How many non-overlapping channels are available with 802.11b?



Explanation:

The IEEE 802.11b standard provides 3 non-overlapping channels.


6. What is the maximum distance with maximum data rate for 802.11b?



Explanation:

The IEEE 802.11b standard provides a maximum data rate of up to only 11Mbps, and you can be around 150 feet, maybe farther, depending on conditions.


7. In which of the following technologies is the term HFC used?



Explanation:

In a modern network, hybrid fibre-coaxial (HFC) is a telecommunications industry term for a network that incorporates both optical fiber and coaxial cable to create a broadband network.


8. 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.


9. Which of the following is private IP address?



Explanation:

Class A private address range is 10.0.0.0 through 10.255.255.255. Class B private address range is 172.16.0.0 through 172.31.255.255, and Class C private address range is 192.168.0.0 through 192.168.255.255.


10. 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.


11.
Which WAN encapsulations can be configured on an asynchronous serial connection?

PPP
ATM
HDLC
SDLC
Frame Relay



Explanation:

Please do not freak out because ATM is an answer to this question. ATM is not covered in depth on the CCNA exam. PPP is mostly used for dial-up (async) services, but ATM could be used as well, though it typically is not used anymore since PPP is so efficient.


12. Which command would you place on interface connected to the Internet?



Explanation:

As in access-lists, you must configure your interfaces before NAT will provide any translations. On the inside networks you would use the command ip nat inside. On the outside interface, you will use the command ip nat outside.


13.   Which protocol does DHCP use at the Transport layer



Explanation:

User Datagram Protocol is a connection network service at the Transport layer, and DHCP uses this connectionless service.


14. You connect a host to a switch port, but the new host cannot log into the server that is plugged into the same switch. What could the problem be?



Explanation:

This question is a little vague, but the best answer is that the VLAN membership for the port is not configured.


15. Which of the following is true regarding VTP?



Explanation:

All Cisco switches are VTP servers by default. No other VTP information is configured on a Cisco switch by default. You must set the VTP domain name on all switches to be the same domain name or they will not share the VTP database.


16. 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.


17. 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.


18.
What is the result of segmenting a network with a bridge (switch)?

It increases the number of collision domains.
It decreases the number of collision domains.
It increases the number of broadcast domains.
It decreases the number of broadcast domains.
It makes smaller collision domains.
It makes larger collision domains.



Explanation:

Bridges break up collision domains, which would increase the number of collision domains in a network and also make smaller collision domains.


19. Which of the following is true when describing a global unicast address?



Explanation:

Unlike unicast addresses, global unicast addresses are meant to be routed.


20. You need to create an access list that will prevent hosts in the network range of 192.168.160.0 to 192.168.191.0. Which of the following lists will you use?



Explanation:

The range of 192.168.160.0 to 192.168.191.0 is a block size of 32. The network address is 192.168.160.0 and the mask would be 255.255.224.0, which for an access list must be a wildcard format of 0.0.31.255. The 31 is used for a block size of 32. The wildcard is always one less than the block size.


21.
Which statements are true regarding ICMP packets?

They acknowledge receipt of a TCP segment.
They guarantee datagram delivery.
They can provide hosts with information about network problems.
They are encapsulated within IP datagrams.



Explanation:

Internet Control Message Protocol (ICMP) is used to send error messages through the network, but they do not work alone. Every segment or ICMP payload must be encapsulated within an IP datagram (or packet).


22.
 
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.


23. You have created a named access list called Blocksales. Which of the following is a valid command for applying this to packets trying to enter interface s0 of your router?



Explanation:

Using a named access list just replaces the number used when applying the list to the router's interface. ip access-group Blocksales in is correct.


24.
Which encapsulations can be configured on a serial interface?

Ethernet
Token Ring
HDLC
Frame Relay
PPP



Explanation:

Ethernet and Token Ring are LAN technologies and cannot be configured on a serial interface. PPP, HDLC, and Frame Relay are layer 2 WAN technologies that are typically configured on a serial interface.


25. What keystroke will terminate setup mode?



Explanation:

You can exit setup mode at any time by using the keystroke Ctrl+C.


26. 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.


27.
What are two purposes for segmentation with a bridge?

To add more broadcast domains.
To create more collision domains.
To add more bandwidth for users.
To allow more broadcasts for users.



Explanation:

Bridges break up collision domains, which allow more bandwidth for users


28. You have 10 users plugged into a hub running 10Mbps half-duplex. There is a server connected to the switch running 10Mbps half-duplex as well. How much bandwidth does each host have to the server?



Explanation:

Each device has 10 Mbpsto the server.


29.
Which of the following would be good reasons to run NAT?

You need to connect to the Internet and your hosts don't have globally unique IP addresses.
You change to a new ISP that requires you to renumber your network.
You don't want any hosts connecting to the Internet.
You require two intranets with duplicate addresses to merge.



Explanation:

The most popular use of NAT is if you want to connect to the Internet and you don't want hosts to have global (real) IP addresses, but option B and D are correct as well.


30. Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2?
  1. The command is used to establish a static route.
  2. The default administrative distance is used.
  3. The command is used to configure the default route.
  4. The subnet mask for the source address is 255.255.255.0.



Explanation:

The debug ip rip command is used to show the Internet Protocol (IP) Routing Information Protocol (RIP) updates being sent and received on the router.




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