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Networking Questions And Answers Sample Test 3


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Networking Test 3


You have scored 3 out of 10
You Scored:2
Total Questions:2
Attended Questions:2
Correct Answered:2
1.
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.


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.
Network 206.143.5.0 was assigned to the Acme Company to connect to its ISP. The administrator of Acme would like to configure one router with the commands to access the Internet. Which commands could be configured on the Gateway router to allow Internet access to the entire network?

Gateway(config)# ip route 0.0.0.0 0.0.0.0 206.143.5.2
Gateway(config)# router rip
Gateway(config-router)# network 206.143.5.0
Gateway(config-router)# network 206.143.5.0 default



Explanation:

There are actually three different ways to configure the same default route, but only two are shown in the answer. First, you can set a default route with the 0.0.0.0 0.0.0.0 mask and then specify the next hop, as in option A. Or you can use 0.0.0.0 0.0.0.0 and use the exit interface instead of the next hop. Finally, you can use option D with the ip default-network command.


4. What is the maximum distance running the lowest data rate for 802.11b?



Explanation:

The IEEE 802.11b standard provides the lowest data rate at 1Mbps, but it also has the longest distance, which is about 350 feet.


5. Which of the following commands will allow you to set your Telnet password on a Cisco router?



Explanation:

The command line vty 0 4 places you in a prompt that will allow you to set or change your Telnet password.


6. You telnet to a router and make your necessary changes; now you want to end the Telnet session. What command do you type in?



Explanation:

Since the question never mentioned anything about a suspended session, you can assume that the Telnet session is still open, and you would just type exit to close the session


7.
If your routing table has a static, a RIP, and an IGRP route to the same network, which route will be used to route packets by default?



Explanation:

Static routes have an administrative distance of 1 by default. Unless you change this, a static route will always be used over any other found route. IGRP has an administrative distance of 100, and RIP has an administrative distance of 120, by default.


8.
How many non-overlapping channels are available with 802.11b?



Explanation:

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


9.
If you want to disable STP on a port connected to a server, which command would you use?



Explanation:

If you have a server or other devices connected into your switch that you're totally sure won't create a switching loop if STP is disabled, you can use something called portfast on these ports. Using it means the port won't spend the usual 50 seconds to come up while STP is converging.


10.
   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.


11.
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.


12. 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.


13.
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.


14.   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.


15. Which of the following is considered to be the address before translation?



Explanation:

The host on the private network before translation is considered to be an inside local host.


16.
If you use either Telnet or FTP, which is the highest layer you are using to transmit data?



Explanation:

Both FTP and Telnet use TCP at the Transport layer; however, they both are Application layer protocols, so the Application layer is the best answer.


17. Which command would you place on interface on a private network?



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.


18. Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?



Explanation:

To turn a binary number into decimal, you just have to add the values of each bit that is a 1. The values of 10011101 are 128, 16, 8, 4, and 1. 128 + 16 + 8 + 4 + 1 = 157.

Hexadecimal is a base-16 number system. The values of hexadecimal are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F-16 characters total, from which to create all the numbers you'll ever need. So, if 1001 in binary is 9, then the hexadecimal equivalent is 9. Since we then have 1101, which is 13 in binary, the hexadecimal answer is D and the complete hexadecimal answer is 0x9D.


19.
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.


20. 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.


21. A default Frame Relay WAN is classified as what type of physical network?



Explanation:

Frame Relay, by default, is a non-broadcast multi-access (NBMA) network, which means that broadcasts, such as RIP updates, will not be forwarded across the link by default.


22.
Which statement is true regarding classless routing protocols?

The use of discontiguous networks is not allowed.
The use of variable length subnet masks is permitted.
RIPv1 is a classless routing protocol.
IGRP supports classless routing within the same autonomous system.
RIPv2 supports classless routing.



Explanation:

Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontiguous networking.


23.
What two multicast addresses does OSPFv3 use?

FF02::A
FF02::9
FF02::5
FF02::6



Explanation:

Adjacencies and next-hop attributes now use link-local addresses, and OSPFv3 still uses multicast traffic to send its updates and acknowledgments with the addresses FF02::5 for OSPF routers and FF02::6 for OSPF designated routers. These are the replacements for 224.0.0.5 and 224.0.0.6, respectively.


24.
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.


25. How many non-overlapping channels are available with 802.11a?



Explanation:

The IEEE 802.11a standard provides up to 12 non-overlapping channels.


26. Which of the following is true when describing a link-local address?



Explanation:

Link-local addresses are meant for throwing together a temporary LAN for meetings or a small LAN that is not going to be routed but needs to share and access files and services locally.


27.
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.


28. 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.


29.
Which of the following statement is true?



Explanation:

Switches break up collision domains, and routers break up broadcast domains.


30.
Which switching technology reduces the size of a broadcast domain?



Explanation:

Virtual LANs break up broadcast domains in layer 2 switched internetworks.




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