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 CCNA Questions

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Q:

Which layer defines how data is formatted , presented, encoded, and converted for use on the network?

Answer

The presentation layer makes sure that data is in a readable format for the Application layer.

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Q:

What is the most common attack on a network today?

A) Lock picking B) Naggle
C) DoS D) auto secure
 
Answer & Explanation Answer: C) DoS

Explanation:

The most common attack on a network today is a denial of service (DoS) because they are the easiest attack to achieve.

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Q:

By default , what type of trust are all Windows 2000 trust relationships within a domain tree or forest?

A) Explicit trust B) One-way trust
C) Transitive trust D) Non-transitive trust
 
Answer & Explanation Answer: C) Transitive trust

Explanation:

By default, all Windows 2000 trusts within a domain tree or forest are transitive trusts.

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Q:

When a ping to the local host IP address fails, what can you assume?

A) The IP address of the local host is incorrect B) The IP address of the remote host is incorrect
C) The NIC is not functional D) The IP stack has failed to initialize
 
Answer & Explanation Answer: C) The NIC is not functional

Explanation:

When a ping to the local host IP address fails, you can assume the NIC is not functional.

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Q:

When data is encapsulated , which is the correct order?

A) Data, frame, packet, segment, bit B) Segment, data, packet, frame, bit
C) Data, segment, packet, frame, bit D) Data, segment, frame, packet, bit
 
Answer & Explanation Answer: C) Data, segment, packet, frame, bit

Explanation:

The encapsulation method is data, segment, packet, frame, bit.

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Q:

What multicast addresses does RIPng use?

A) FF02::A B) FF02::9
C) FF02::5 D) FF02::6
 
Answer & Explanation Answer: B) FF02::9

Explanation:

RIPng uses the multicast IPv6 address of FF02::9. If you remember the multicast addresses for IPv4, the numbers at the end of each IPv6 address are the same.

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Q:

You have a Class B network and need 29 subnets. What is your mask?

Answer

A default Class B is 255.255.0.0. A Class B 255.255.255.0 mask is 256 subnets, each with 254 hosts. We need fewer subnets. If we used 255.255.240. 0, this provides 16 subnets. Let's add one more subnet bit. 255.255.248.0. This is 5 bits of subnetting, which provides 32 subnets. This is our best answer A/21

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Q:

All hosts in the networks have been operational for several hours when the DHCP server goes down. What happens to the hosts that have obtained service from the DHCP server?

A. The hosts will not be able to communicate with any other hosts.
B. The hosts will continue to communicate normally for a period of time.
C. The hosts will be able to communicate with hosts outsides their own network
D. The hosts will only be able to communicate with other hosts by IP address not by host name

Answer

Answer : B


 


Explanation : Dynamic Host configuration Protocol – DHCP – assigns an IP address to a client for a limited period of time, this address is then saved in a database. When the DHCP Server goes down, that client can still use the allocated IP address for a limited period of time.

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