Computer Networks

It is a socket on computer used to connect modem or other devices through a serial interface. It provides very slow speed.

This answer is the correct because an external modem will work properly only with an AC adapter.

IAN  connects voice and data endpoints within a cloud environment over IP.

A firewall is a network device for controlling network security and access rules.

It is a logically visible subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting.

NIC stands for Network Information Centre, which is an organization that manages domain name registrations and provides information about network resources. The other options have spelling errors or incorrect terms. Network Information Centres are crucial for internet infrastructure management.

In computer architecture, a bus is a subsystem that transfers data between components inside a computer.

It will cover a large geographical area.

Broadband refers to high-speed data transmission in which a single cable can carry a large amount of data at once.

It is a device that allows digital information from several sources to be routed onto a single output line for transmission over to a common destination.

A web service is a method of communication between two electronic devices over a network. 

In a chain network of communication, each member of the group can interact with the adjoining members. It is not considered as a centralised network.

Half-duplex transmission allows two-way communication but not simultaneously - data flows in one direction at a time, alternating between send and receive. Simplex is one-way only, full-duplex is bidirectional simultaneously.

Server-based networks feature centralized security management through the server, which authenticates users and controls access to resources. While nodes in client-server architecture can be intelligent and these networks can have high bandwidth, the defining characteristic is the central security authority.

The question asks which statement is WRONG. WANs (Wide Area Networks) covering large geographic areas are typically slower than LANs (Local Area Networks) due to longer distances, shared infrastructure, and congestion. Options A, C, and D describe true characteristics, making B the false statement.