OSI Model and its Layers - 1

In a class C, IP address; the first three bytes represent the network. The first three bits are 1,1 and 0 which mean that there are 2²¹ network possibilities, i.e. 2,097,152. The networks available in class C are networks going from 192.0.0.0 to 223.255.255.0. Therefore, it uses three network IDs to identify the class.

Yes, this layer provides delivery and formatting of the information to the application layer as it provides data presentation and encryption to the application before sending the data.

Yes, IPV6 protocol has 128 bits i.e. 16 bytes address.

Yes, Internet Message Access Protocol is defined by the application layer.

It defines the range 192-223 .

POP-3 used to download the email by an email client form an email server.

Domain name system is hierarchical (cs.uktech.gov.in) (Uttrakhand technical University in India ) and distributed (systems are connected to the network). So, this convention should work every where.

This is the correct answer , the exact possible number of networks in class B is 16384. It is calculated as 2^{14 =} 16384. 14 is a usable network ID bits (16 - 2 = 14).

This is a wrong statement about tree topology as a tree topology has a hierarchical structure in the network and vastly divided in to many branches, so it is better to use it for a wide range of networks for the better use of cables.

Transport layer provides end-to-end communication services for the applications. Multiplexing is also a communication method for the multiple data streams in to a single node over a shared medium.

This field prevents packets from endlessly circulating on an IPV6 network.

Range of ip address is from 224.0.0.0 to 239.255.255.255 used for multicast packets. It is used to transmit the same packet, from a single source, to a group of selected destinations.

It is a network layer protocol used to obtain an IP address for a given hardware address.

It provides services to network layer as each layer provides services to its adjacent upper layer in the OSI model and the network layer is the just upper layer of the data link layer.

This is a class B host address. The range of first byte of class B is 128-191. The left most n bits(prefix) define the network and the rightmost 32-n bits define the host.