CCNA – Basic Questions
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:
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 orSM fiber | 10 km (SM)3 km (MM) |
| 1000BASE-SX | Short-wavelength laser, MM fiber | 220 m with 62.5-micron fiber; 550 mwith 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.
Question 10
Which two topologies are using the correct type of twisted-pair cables? (Choose two)
A. 
B. 
C. 
D. 
E. 
Answer: D E
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Can anyone kindly explain logic behind question # 10?
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@kamran
A:
crossover cable connects PC to switch… never. use straightthrough cable
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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@xallax
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@xallax
is this an IPV6 address
2000:3452:4952:2837::
plz answer me
@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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@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
@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?
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@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
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@sam
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@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?
@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…”
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@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???
@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.
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@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
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@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
@islam: I think D is also correct.
@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.
I am going to take CCNA exam
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Thanks!!!
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
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@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
@tp
keyword: “ethernet”.
@islam
hostB is on a different network.
hostA will send the frames towards the default gateway <= first step