TCP/IP

Option: A
Explanation :Physical layer is a layer 1 device which deals with network cables or the standards in use like connectors, pins, electric current used etc. Basically the transmission speed is determined by the cables and connectors used. Hence it is physical layer that determines the transmission speed in network.

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Option: B
Explanation :A port address in TCP/IP is 16 bits in length. In the TCP/IP protocol suite, the port numbers are integers between 0 and 65,535.
Port Address is also called a port number is the logical address of each application or process that uses a network or the Internet to communicate. A port number uniquely identifies a network-based application on a computer.

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Option: C
Explanation :In the TCP/IP architecture, the label assigned to a process is called a port address. A port address in TCP/IP is 16 bits in length.
Port Address is also called a port number is the logical address of each application or process that uses a network or the Internet to communicate. A port number uniquely identifies a network-based application on a computer.

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Option: D
Explanation :When TCP/IP is compared to OSI, we can say that the TCP/IP protocol suite is made of five layers: physical, data link, network, transport, and application. Four levels of addresses are used in an internet employing the TCP/IP protocols: physical, logical, port, and specific.

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