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Networking Questions And Answers Sample Test 1


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Networking Test 1


You have scored 3 out of 10
You Scored:2
Total Questions:2
Attended Questions:2
Correct Answered:2
1.
To enable EIGRP, which of the following would you use?

Router1(config-if)# ipv6 ospf 10 area 0.0.0.0
Router1(config-if)# ipv6 router rip 1
Router1(config)# ipv6 router eigrp 10
Router1(config-rtr)# no shutdown
Router1(config-if)# ipv6 eigrp 10 



Explanation:

Unlike RIPng and OSPFv3, you need to configure EIGRP both from global configuration mode and from interface mode, and you have to enable the command with the no shutdown command.


2.
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.


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. 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.


5. Which of the following commands displays the configurable parameters and statistics of all interfaces on a router?



Explanation:

With the show interfaces command, you can view the configurable parameters, get statistics for the interfaces on the router, verify if the interfaces are shut down, and see the IP address of each interface.


6.
Which of the following is true regarding VLANs?



Explanation:

Switches do not propagate VLAN information by default; you must configure the VTP domain. VLAN Trunk Protocol (VTP) is used to propagate VLAN information across a trunked link.


7. You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?



Explanation:

A /29 (255.255.255.248), regardless of the class of address, has only 3 host bits. Six hosts is the maximum number of hosts on this LAN, including the router interface.


8.   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.


9. The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?



Explanation:

The four layers of the DoD model are Application/Process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.


10.
Which statement(s) about IPv6 addresses are true?

Leading zeros are required.
Two colons (::) are used to represent successive hexadecimal fields of zeros.
Two colons (::) are used to separate fields.
A single interface will have multiple IPv6 addresses of different types.



Explanation:

In order to shorten the written length of an IPv6 address, successive fields of zeros may be replaced by double colons. In trying to shorten the address further, leading zeros may also be removed. Just as with IPv4, a single device's interface can have more than one address; with IPv6 there are more types of addresses and the same rule applies. There can be link-local, global unicast, and multicast addresses all assigned to the same interface.


11. 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.


12.
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.


13. What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?



Explanation:

A /27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts. Does it matter if this mask is used with a Class A, B, or C network address? Not at all. The number of host bits would never change.


14. When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?



Explanation:

Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your nonproduction test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.


15. What protocol does PPP use to identify the Network layer protocol?



Explanation:

Network Control Protocol is used to help identify the Network layer protocol used in the packet.


16. To enable RIPng, which of the following would you use?



Explanation:

It's pretty simple to enable RIPng for IPv6. You configure it right on the interface where you want RIP to run with the ipv6 router rip number command.


17. Which of the following commands sets the secret password to Cisco?



Explanation:

The enable secret password is case sensitive, so the second option is wrong. To set the enable secret <password>, use the enable secret <password> command from global configuration mode.


18. Which command will display the CHAP authentication process as it occurs between two routers in the network?



Explanation:

The command debug ppp authentication will show you the authentication process that PPP uses between point-to-point connections.


19. 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.


20. Which layer 4 protocol is used for a Telnet connection?



Explanation:

Although Telnet does use TCP and IP (TCP/IP), the question specifically asks about layer 4, and IP works at layer 3. Telnet uses TCP at layer 4.


21.
What is the maximum data rate for the 802.11a standard?



Explanation:

The IEEE 802.11a standard provides a maximum data rate of up to 54Mbps.


22.      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).


23. You want to run the new 802.1w on your switches. Which of the following would enable this protocol?



Explanation:

802.1w is the also called Rapid Spanning Tree Protocol. It is not enabled by default on Cisco switches, but it is a better STP to run since it has all the fixes that the Cisco extensions provide with 802.1d.


24. A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?



Explanation:

A receiving host can control the transmitter by using flow control (TCP uses Windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does not overflow its buffers.


25. Which protocol reduces administrative overhead in a switched network by allowing the configuration of a new VLAN to be distributed to all the switches in a domain?



Explanation:

Virtual Trunk Protocol (VTP) is used to pass a VLAN database to any or all switches in the switched network. The three VTP modes are server, client, and transparent.


26. 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.


27.
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.


28. What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?



Explanation:

The four layers of the TCP/IP stack (also called the DoD model) are Application/Process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.


29. What router command allows you to determine whether an IP access list is enabled on a particular interface?



Explanation:

Only the show ip interface command will tell you which interfaces have access lists applied. show access-lists will not show you which interfaces have an access list applied.


30. Which command loads a new version of the Cisco IOS into a router?



Explanation:

The command copy tftp flash will allow you to copy a new IOS into flash memory on your router.




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