The main reason for changing IP addresses from IPv4 to IPv6

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The main reason for changing IP addresses from IPv4 to IPv6 is

Abetter technology

Bfaster transfer rate

Clesser number of collisions

DIPv6 provides more addresses than IPv4.

Akilesh Kharvi ? Dec 8 '2016 at 21:29

Answer : IPv6 provides more addresses than IPv4.

Explanation:

IPv4 uses 32 bits for an IP address that allows about 4 billion unique IP addresses. When IPv4 was introduced in the 1970s and accepted as the protocol for the Internet, they did not foresee this explosion in the popularity of the Internet or the extent to which online technologies would become all pervasive. It was therefore firmly believed that these 4 billion addresses would be sufficient to cover any future growth of the Internet.

IPv6 uses 128 bits for IPv6 addresses which allows for 340 billion billion billion billion (3.4x1038) unique addresses.

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When secure data is to be transmitted over a network, encryp

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When secure data is to be transmitted over a network, encryption and decryption are undertaken by the

Aphysical layer

Btransport layer

Cpresentation layer

Dsession layer.

Akilesh Kharvi ? Dec 8 '2016 at 21:28

Answer:  presentation layer

Explanation:

encryption and decryption is takes place at presentation layer

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The network topology with the highest reliability is

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The network topology with the highest reliability is

Abus

Bstar

Cring

Dmesh

Akilesh Kharvi ? Dec 8 '2016 at 19:37

Answer: mesh

Explanation:

Mess Topology is a network setup where each computer and network device is interconnected with one another, allowing for most transmissions to be distributed, even if one of the connections go down. This topology is not commonly used for most computer networks as it is difficult and expensive to have redundant connection to every computer. However, this topology is commonly used for wireless networks.

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Start and stop bits are used in serial communication for

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Start and stop bits are used in serial communication for

Aerror detection

Berror correction

Csecurity

Dsynchronisation

Akilesh Kharvi ? Dec 8 '2016 at 19:33

Answer: Synchronisation

Explanation:

In serial communication each byte is preceded by a start bit and followed by one stop bit. The start and stop bits are used to synchronize the serial recivers.

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The count to infinity problem is associated with

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The count to infinity problem is associated with

ALink State Protocol

BDistance Vector Routing Protocol

CDNS, while resolving host name

DTCP for congestion control

Akilesh Kharvi ? Dec 8 '2016 at 19:27

Answer : Distance Vector Routing Protocol

Explanation:Distance-vector protocols are based on calculating the direction and distance to any link in a network. "Direction" usually means the next hop address and the exit interface. 

The Distance-vector protocols does not prevent routing loops from happening and suffers from the count-to-infinity problem.

An example would if Router 2's link to Network A is via Router 1's link i.e. R2 has learned about a route to network A from R1 initially.

If Router 1's link to network A fails, R1 will update its routing table immediately to make the distance 16 (infinite). In the next broadcast, R1 will report the higher cost route. Now suppose r2 advertise a route to Network A via R1 in its normal advertisement message, just after R1’s connection to network A fails. If so R1 will receive this update message and sees that Router 2 has a two-hop link (which is actually via Router 1) to Network A, according to the normal vector-distance algorithm it will install a new route to network A via R2, of length 3.

After this, it would began advertising it has a three-hop link to Network A and
then route all traffic to Network A through R2. This would create a routing loop, since when Router 2 (R2) sees that Router 1 get to Network A in three hops, it alters it own routing table entry to show it has a four-hop path to Network A.

This is known as Count-to Infinity problem, i.e. bad news travel slowly through the network and to advertise a bad news throughout the entire network will take a long time.This problem is also called as slow convergence problem.In the next section we shall discuss some of the possible solutions to this slow convergence problem

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