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New CCNA – IPv6 Questions.

 
This is an Updated real CCNA exam question (Nov.-2013). 

As usual, take time to read through the question so as to clearly understand what Cisco want you to do.
A set of questions are set using different context, but it all works the same way, try and understand the technique.

 
Note: This IPv6 questions are used for demonstration only. 

I suggest you use packet tracer for practice.

Question 1

Select the valid IPv6 addresses. (Choose all apply)

A – ::192:168:0:1
B – 2002:c0a8:101::42
C – 2003:dead:beef:4dad:23:46:bb:101
D – ::
E – 2000::
F – 2001:3452:4952:2837::
 
Answer: A B C D F

Explanation:
Option A is correct because it’s a short form of IPv6 address 0:0:0:0:192:168:0:1 

Option B is equally correct because is also a short form of 2002:c0a8:0101:0:0:0:0:0042. 
 
C is a normal IPv6 address: 2003:dead:beef:4dad:23:46:bb:101

D is correct because the double colon “::” is termed as an “unspecified” address , this is normally used in the source field of a datagram that is sent by a device to a DHCPv6 server asking for IP address configuration.

F is correct because it’s a valid IPv6 network address.


Question 2

Which two of these statements are true of IPv6 address representation? (Choose two)
A – The first 64 bits represent the dynamically created interface ID.
B – A single interface may be assigned multiple IPV6 addresses of any type. 
C – Every IPV6 interface contains at least one loopback address.
D – Leading zeros in an IPV6 16 bit hexadecimal field are mandatory.
 
Answer: B C
 

Question 3.
In practical IPv6 application, The encapsulation of IPv6 packets inside IPv4 packets is called what?

A – tunneling 
B – hashing 
C – routing 
D – NAT
 
Answer: A

Explanation:
Remember,  most network is still build on IPv4 structure and IPv4 is not going away in a hurry… one of the many techniques used to migrate to IPv6 is Tunneling. 

Tunneling is a method that a network built on IPv4 structure can be configured to traffic IPv6 packet simultaneously.



Question 4

Internet Protocol version 6 (IPv6) is the next-generation Internet Protocol version designated as the successor to IPv4 because IPv4 address space is being exhausted. Which one of the following descriptions about IPv6 is correct?

A – Addresses are not hierarchical and are assigned at random. 
B – Broadcasts have been eliminated and replaced with multicasts. 
C – There are 2.7 billion available addresses.
D – An interface can only be configured with one IPv6 address.
 
Answer: B

Explanation:
The IPv6 multicast traffic is same as that of IPv4 broadcast. The packet intended to multiple hosts is sent on a special IPv6 multicast address. Any host or interface that are member of that multicast address will receive the  multicast information or packet and process it.

Question 5

What is the Multicast for all-router multicast access ?

A – FF02::4
B – FF02::3
C – FF02::2
D – FF02::1

Answer: C

Explanation in brief
FF02::2 is an all-router multicast address access for all hosts in a particular multicast group.
 


Question 6
Which three of the following are IPv6 transition mechanisms? (Choose three)

A – 6to4 tunneling
B – GRE tunneling
C – ISATAP tunneling
D – Teredo tunneling
E – VPN tunneling
F – PPP tunneling
 
Answer: A B C 

Explanation OF Terms:

6to4 Tunnels – Just as the name suggest; a 6to4 tunnel enables IPv6 to be tunneled via IPv4. This sort of tunneling is automatically set up using the 2002::/16 IPv6 address space. 
 
Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) Tunnels – This another type of tunnelling method that when used, it enables the transportation of IPv6 traffic over IPv4; this type of ISATAP method is meant for use inside a site and not between two dual stacked edge devices. The trafficking of packets between IPv6 hosts is handled through a central IPv6 enabled device.

Generic Routing Encapsulation (GRE) IPv6 tunnels – GRE is a Cisco proprietary protocol that was developed for the purposes of IPv6 tunneling. It operates very much the same as manual tunnels.  
GRE is specially used to tunnel over a diverse number of network layer protocols other than IPv4. The GRE tunnel can be used to tunnel IPv6 over IPv4 vice versa. 

Question 7

In the IPv6 address structure, how many bits are included in each field?

A – 24 
B – 4
C – 3
D – 16
E - 128
 
AnswerD

Explanation:
The format of IPv6 address looks like this:  210A:0197:190F:005a:0000:082C:875A:132c.Each field separated by the colon (:) is 16-bit hexadecimal values, in all; you have 8 sets of 4 hexadecimal digits. 
 
Question 8
Which two descriptions are correct about characteristics of IPv6 unicast addressing? (Choose two)
A – Global addresses start with 2000::/3.
B – Link-local addresses start with FF00::/10.
C – Link-local addresses start with FE00:/12.
D – There is only one loopback address and it is ::1.
 
Answer: A D

Explanation:

An IPv6 Unicast address identifies a single network interface. The Internet Protocol delivers packets sent to a unicast address to that specific interface.

 
 

 
 
 
 


 
 
 
 
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