Physical or logical arrangement of network is

Correct Answer: The OSI Model is used as a reference model The primary reason the OSI model was created was so that different networks could inter-operate Hence, different networks could communicate

Correct Answer: Skype is an example of VoIP software.

Explanation:

VOIP is an acronym for Voice Over Internet Protocol, or in more common terms phone service over the Internet.

 

Voice over Internet Protocol is a category of hardware and software that enables people to use the Internet as the transmission medium for telephone calls by sending voice data in packets using IP rather than by traditional circuit transmissions of the PSTN.

 

Here in the given options, Skype is the only voice service that enables us to talk over internet.

Correct Answer: Graphical User Interface

Correct Answer: Data Protection Act

Correct Answer: RST 65 & RST 55 are level-triggering interrupts

Correct Answer: A layer of a glass surrounding the center fiber of glass inside a fiber-optic cable

Correct Answer: The data unit created at the application layer is called a message, at the transport layer the data unit created is called either a segment or an user datagram, at the network layer the data unit created is called the datagram, at the data link layer the datagram is encapsulated in to a frame and finally transmitted as signals along the transmission media

Correct Answer: 128 bits

Explanation:

IPv6 - Internet Protocol Version 6.

IPv6 addresses have a size of 128 bits.

Internet Protocol Version 6 [IPv6] is the successor to the Internet's first addressing infrastructure, Internet Protocol version 4 (IPv4).

In contrast to IPv4, which defined an IP address as a 32-bit value, IPv6 address have a size of 128 bits. 

Correct Answer: There are two IP address assigned to each device on a Wi-Fi network An Internal (Private) and an External (Public) IP address Internal IP address is used for communication between Your computer and a smartphone or whatever devices that are connected to that Wifi network This is unique for each If they are same the system cannot differentiate between each device While, the External IP address is that visible to the the internet - the websites, the internet connected Apps so on By default, Routers with NAT (all routers today have it) assign same Public IP address to all devices under its network

Correct Answer: A method for providing fault tolerance by using multiple hard disk drives