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CCNA – Basic Questions

November 12th, 2011 Go to comments

Here you will find answers to CCNA – Basic Questions

Question 1

For which type of connection should a straight-through cable be used?

A. switch to switch
B. switch to hub
C. switch to router
D. hub to hub
E. router to PC


Answer: C

Explanation

To specify when we use crossover cable or straight-through cable, we should remember:

Group 1: Router, Host, Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable

In this case we can use straight-through cable to connect a switch to a router -> C is correct.

Question 2

Which type of cable is used to connect the COM port of a host to the COM port of a router or switch?

A. crossover
B. straight-through
C. rolled
D. shielded twisted-pair


Answer: C

Explanation

The correct question should be “Which type of cable is used to connect the COM port of a host to the CONSOLE port of a router or switch?” and the correct answer is rollover cable. But we can’t plug this rollover cable directly into our host because it will not work. We often use a RJ45 to DB9 Female cable converter as shown below:

rollover_db9cable.jpg

Question 3

What is the first 24 bits in a MAC address called?

A. NIC
B. BIA
C. OUI
D. VAI


Answer: C

Explanation

Organizational Unique Identifier (OUI) is the first 24 bits of a MAC address for a network device, which indicates the specific vendor for that device as assigned by the Institute of Electrical and Electronics Engineers, Incorporated (IEEE). This identifier uniquely identifies a vendor, manufacturer, or an organization.

Question 4

In an Ethernet network, under what two scenarios can devices transmit? (Choose two)

A. when they receive a special token
B. when there is a carrier
C. when they detect no other devices are sending
D. when the medium is idle
E. when the server grants access


Answer: C D

Explanation

Ethernet network is a shared environment so all devices have the right to access to the medium. If more than one device transmits simultaneously, the signals collide and can not reach the destination.

If a device detects another device is sending, it will wait for a specified amount of time before attempting to transmit.

When there is no traffic detected, a device will transmit its message. While this transmission is occurring, the device continues to listen for traffic or collisions on the LAN. After the message is sent, the device returns to its default listening mode.

So we can see C and D are the correct answers. But in fact “answer C – when they detect no other devices are sending” and “when the medium is idle” are nearly the same.

Question 5

Which two benefits are provided by using a hierarchical addressing network addressing scheme? (Choose two)

A. reduces routing table entries
B. auto-negotiation of media rates
C. efficient utilization of MAC addresses
D. dedicated communications between devices
E. ease of management and troubleshooting


Answer: A E

Question 6

When a host transmits data across a network to another host, which process does the data go through?

A. standardization
B. conversion
C. encapsulation
D. synchronization


Answer: C

Explanation

To transmit to another host, a host must go through the TCP/IP model (very similar to the OSI model). At each layer, the message is encapsulated with that layer’s header (and trailer if it has). This process is called encapsulation.

Question 7

Which two Ethernet fiber-optic modes support distances of greater than 550 meters?

A. 1000BASE-CX
B. 100BASE-FX
C. 1000BASE-LX
D. 1000BASE-SX
E. 1000BASE-ZX


Answer: C E

Explanation

Below lists the cabling standards mentioned above

Standard Cabling Maximum length
1000BASE-CX Twinaxial cabling 25 meters
100BASE-FX Two strands, multimode 400 m
1000BASE-LX Long-wavelength laser, MM or
SM fiber
10 km (SM)
3 km (MM)
1000BASE-SX Short-wavelength laser, MM fiber 220 m with 62.5-micron fiber; 550 m
with 50-micron fiber
1000BASE-ZX Extended wavelength, SM fiber 100 km

Note:

+ MM: Multimode
+ SM: Single-mode

(Reference: The official self-study test preparation guide to the Cisco CCNA INTRO exam 640-821)

Question 8

Refer to the exhibit. What type of connection would be supported by the cable diagram shown?

Pin Color Function Pin Color Function
1 White/Green TX+ 1 White/Green TX+
2 Green TX- 2 Green TX-
3 White/Orange RX+ 3 White/Orange RX+
6 Orange RX- 6 Orange RX-

A. PC to router
B. PC to switch
C. server to router
D. router to router


Answer: B

Explanation

From the “Pin” and “Color” in the exhibit we know that this is a straight-through cable so it can be used to connect PC to switch.

Question 9

Refer to the exhibit. What type of connection would be supported by the cable diagram shown?

Pin Color Function Pin Color Function
1 White/Green TX+ 3 White/Green RX+
2 Green TX- 6 Green RX-
3 White/Orange RX+ 1 White/Orange TX+
6 Orange RX- 2 Orange TX-

A. PC to router
B. PC to switch
C. server to switch
D. switch to router


Answer: A

Explanation

This is a crossover cable so it can be used to connect PC and router.

rj45-crossover-cable.jpg

Question 10

Which two topologies are using the correct type of twisted-pair cables? (Choose two)

A. connection_pc_switch.jpg

B. connection_router_pc.jpg

C. connection_switch_router.jpg

D. connection_switch_pc.jpg

E. connection_switch_switch.jpg


Answer: D E

Comments (693) Comments
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    @cert where the questions different..can u give an idea of what to expect in the exam..I am taking mine in a few weeks.

  9. Dan
    January 5th, 2012

    Just a quick question on question 1 of this.

    When i check whether or not to use crossover/straight through i say

    like to like = cross over

    like to unlike = straight through

    Therefore on this question im confused as to why we rule out answer E as a possible answer to this question. As a router and PC is like to unlike device, should this not use a straight through?

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  27. Alex
    January 11th, 2012

    @Dan, PC’s can work in all layers. So it can also be a layer 3 device. Router is in layer 3 so we the answer is cross over cable.

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  58. xallax
    January 17th, 2012

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    A:
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    B:
    crossover cable to router CON0 port. never. use rollover cable

    C: crossover cable between router and switch. never. use straight

    D: crossover cable between PC and router. true

    E: crossover cable between 2 devices of the same type (2 switches on this scenario). true

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    January 19th, 2012

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  70. Anonymous
    January 20th, 2012

    @xallax
    is this an IPV6 address
    2000:3452:4952:2837::

    plz answer me

  71. islam
    January 20th, 2012

    @xallax
    what is the valid reason for a switch to deny port access to new devices when port security is enabled?
    A. the denied MAC addresses have been already learned or configured on another secure interface in the same vlan.
    B. the denied MAC addresses are statically configured on the port.
    C.the minimum MAC threshold has been reached.
    D.the absoulte aging times for the denies MAC addresses have expired.

    plz answer me

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    January 20th, 2012

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  73. xallax
    January 20th, 2012

    @anonymous
    yes, it is
    2000:3452:4952:2837:0000:0000:0000:0000
    2000:3452:4952:2837:0:0:0:0
    2000:3452:4952:2837::
    the 3 examples above are equivalent.

    @islam
    the correct answer is A. there can not be 2 entries in the MAC table for the same MAC address on different ports

  74. islam
    January 20th, 2012

    @xallax
    which states are the port when RSTP has converged?
    A. blocking
    B. learning
    C. disabled
    D. forwarding
    E. listening

    in dump : C D
    and why we dont take A D?

  75. omy
    January 20th, 2012

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    January 20th, 2012

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    January 20th, 2012

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  78. Sam
    January 20th, 2012

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  79. xallax
    January 20th, 2012

    @islam
    RSTP has 3 port states: discarding, learning, forwarding.
    http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

    i would pick B and D as answers from your list…

    @omy
    check the links on the right edge of the screen please
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    http://www.certprepare.com
    http://www.networktut.com

    @sam
    check http://www.ciscovce.com for practice questions in VCE and PDF format

  80. islam
    January 20th, 2012

    @xallax
    which states are the port when RSTP has converged?
    A. blocking
    B. learning
    C. disabled
    D. forwarding
    E. listening
    in dump : C D
    and why we dont take A D?

  81. xallax
    January 20th, 2012

    @islam
    already posted an answer, it is awaiting moderation…

    my answer to you was:
    “RSTP has 3 port states: discarding, learning, forwarding.
    http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

    i would pick B and D as answers from your list…”

  82. cwongus
    January 20th, 2012

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  83. Anonymous
    January 21st, 2012

    can some verify if this dump has questions in your actual exam

    http://www.examcollection.com/cisco/Cisco.TestKiss.640-802.v2011-6-15.by.C3PO.142q.vce.file.html

  84. Allan
    January 21st, 2012

    Hi ,I started studying for my CCNA since dec 16th, I’ve done some labs on 3 routers just to get a feel of the commands and configurations. For my reading , I’m using the skillsoft.com site supplemented by the Todd Lammle book. I’m using this site for the likely questions and the never changing sims. I just want assurance that I would make it next week (Jan 25th)for the exams. I welcome any suggestion.
    thanks.

  85. islam
    January 21st, 2012

    @xallax
    am sorry um very confused

    which states are the port when RSTP has converged?
    A. blocking
    B. learning
    C. disabled
    D. forwarding
    E. listening
    in dump : C D
    and another dump : A D
    you said that is : B D

    um sorry again just tell me the correct one???

  86. xallax
    January 21st, 2012

    @islam
    please click on this link:
    http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml#states

    there are only 3 states in RSTP: Discarding, Learning , Forwarding.

    now look at the given options and you will agre that only Learning and Forwarding (B and D) are valid options.

  87. kareem hafez
    January 22nd, 2012

    Hii , I’m going for CCNA exams this month , please can you send me the latest dumps … my email : kareem.roushdy@gmail.com

  88. tristan
    January 22nd, 2012

    Hi! I’m going to take the CCNA Exam next week. Can you please email the latest dumps to me: tristanbulandus@yahoo.com thanks

  89. islam
    January 22nd, 2012

    @9tut
    given that hostA and hostB are in different networks. when hostA is trying to communicate with HostB, which step will hostA take first?
    A. send a TCP SYN and wait the SYN ACK with the IP address of Host B
    B. Dope the data
    C. create an ARP request to get a MAC address for hostB
    D. send the data frames to the default gateway

    in dump C
    i think it is D
    explain it to me plz

  90. Awino
    January 22nd, 2012

    Hello,i will be taking my CCNA exams in March,someone to please send me the latest exam dumps.
    Thanks in advance.

  91. Awino
    January 22nd, 2012

    just forgot to put my email address for the latest CCNA dumps….agutumil@yahoo.com

  92. islam
    January 22nd, 2012

    @9tut
    identify the four valid IPV6 addresses
    A. A
    B. ::192:168:0:1
    C. 2000::
    D. 2001:3452:4952:2837::
    E. 2002:c0a8:101::42
    F. 2003:dead:4dad:23:46:bb:101

    in dump ABEF
    and why we dont take D I think ots correct too

  93. 9tut
    January 23rd, 2012

    @islam: I think D is also correct.

  94. DimS
    January 23rd, 2012

    @islam: D – is correct.
    F – is wrong. IPv6 has 8 fields separated by “:”. If some fields have zero value, we are able to miss these fields and to use “::” instead of “:”. But in your case IPv6 address has 7 fields separated “:”.
    This question was in my exam.

  95. Orep007
    January 23rd, 2012

    I am going to take CCNA exam

    please send me latest dump.on this ID

    orep007@gmail.com

    Thanks!!!

  96. tp
    January 23rd, 2012

    In an Ethernet network, under what two scenarios can devices transmit? (Choose two)

    A. when they receive a special token
    B. when there is a carrier
    C. when they detect no other devices are sending
    D. when the medium is idle
    E. when the server grants access

    Why ans A is wrong as in token ring we need a spl token

  97. aliyah m. bah
    January 23rd, 2012

    am attaemting my first ccna discover 1 chapter 1 exam can some one dump me a brief Q&A

  98. aliyah m. bah
    January 23rd, 2012

    aliayahunited@yahoo.com for any dump in ccna i qa

  99. islam
    January 23rd, 2012

    @9tut
    given that hostA and hostB are in different networks. when hostA is trying to communicate with HostB, which step will hostA take first?
    A. send a TCP SYN and wait the SYN ACK with the IP address of Host B
    B. Dope the data
    C. create an ARP request to get a MAC address for hostB
    D. send the data frames to the default gateway
    in dump C
    i think it is D

    explain it to me plz
    Awino January 22nd, 2012

  100. xallax
    January 23rd, 2012

    @tp
    keyword: “ethernet”.

    @islam
    hostB is on a different network.
    hostA will send the frames towards the default gateway <= first step

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