Computer Networks

WiFi (Wireless Fidelity) is the common name for wireless local area networks. LAN is Local Area Network (wired or wireless), WAN is Wide Area Network, and EPABX is a telephone exchange system. WiFi is the specific technology for wireless networking.

A modem (modulator-demodulator) enables computers to transmit data over telephone lines by converting digital signals to analog and back. CD-ROM drives read optical discs, RAM is memory, and hard drives store data - only the modem provides telephone-line connectivity.

RJ-11 is the standard connector used for telephone lines. It has 4-6 pins and is the small plastic plug found in phone jacks. RJ-45 is larger and used for Ethernet networks, while COM1 is a serial port designation, not a physical connector type.

Samba is the standard file-sharing service for Linux/Unix systems that allows them to share files and printers with Windows systems over a network using the SMB/CIFS protocol. It enables resource sharing on both intranets and the Internet.

WAN stands for Wide Area Network, which is a telecommunications network that extends over a large geographical distance. It connects smaller networks like LANs (Local Area Networks) across cities, countries, or continents. Option B correctly identifies this expansion.

WAN (Wide Area Network) connects networks over large geographical distances using dedicated high-speed communication lines. The Internet is the largest WAN. LAN (Local Area Network) covers small areas like a building, URL is a web address, and World Wide Web is a system of interlinked documents accessed via the Internet.

A file server is a computer specifically dedicated to storing and managing files that can be accessed by other computers on a network. It provides centralized storage, backup, and file sharing capabilities for all connected devices. The other options are incorrect: clip art refers to pre-made images, a motherboard is the main circuit board in a computer, and peripherals are external devices like keyboards and printers.

LAN (Local Area Network) is a small network confined to a single site like a home, office, or building. DSL is an internet connection technology, RAM is computer memory, and USB is a peripheral connection standard.

LAN stands for Local Area Network - a computer network that connects devices within a limited area like a home, office, or building. Option C is the correct technical definition.

VPN stands for Virtual Private Network, which extends a private network across a public network and enables users to send and receive data across shared or public networks as if their devices were directly connected to the private network. Options B, C, and D incorrectly use 'Voice' instead of 'Virtual' - VPN is not about voice transmission (that would be VoIP).

In Yahoo! Messenger, the keyboard shortcut Ctrl+G was used to send a 'buzz' notification to your chat friend to get their attention. Alt+B, Ctrl+B, and Alt+G are not the correct shortcuts.

IS-41 is a standard for CDMA and TDMA networks. GSM uses different standards (MAP). This question tests knowledge of which network technologies share the IS-41 interoperability standard.

The maximum message size in SMS depends on the network technology and implementation. Different networks have different constraints (e.g., 160 characters for GSM, varies for others). It is not a fixed value across all technologies.

An SMS gateway acts as a bridge between different networks and media, converting SMS messages to mobile network traffic and vice versa. It enables sending/receiving SMS without a mobile phone - through email, web applications, or APIs. VMS is voicemail, EMS is enhanced messaging (largely obsolete), and 'Fast SMS' is not a standard term.