Computer Networks

The Transport Layer (Layer 4) provides reliable, end-to-end communication services in the TCP/IP model. It handles error detection, flow control, and ensures data arrives correctly and in order through protocols like TCP and UDP.

The Transport Layer specifies protocols like TCP (reliable, connection-oriented) and UDP (unreliable, connectionless). TFTP uses UDP but is an Application layer protocol, while DNS operates at the Application layer and can use both TCP and UDP for transport.

SMTP (Simple Mail Transfer Protocol) is the standard protocol for email transmission and traditionally uses port 25. The other ports listed are for different services: port 21 is for FTP (File Transfer Protocol), port 23 is for Telnet (remote login), and port 80 is for HTTP (web traffic).

SSL stands for Secure Sockets Layer, a cryptographic protocol designed to provide secure communication over computer networks. The other options are incorrect: SSL involves 'sockets' (network connection endpoints), not LAN; and it's a protocol layer, not specifically software.

SMTP (Simple Mail Transfer Protocol) is the standard protocol for sending email between mail servers. The other protocols serve different purposes: FTP is for file transfers, SSH is for secure remote access, and POP3/IMAP are protocols for receiving (not sending) email.

192.168.1.100 is a private IP address in the RFC 1918 range 192.168.0.0/16, reserved for local networks. The other options (74.125.127.100, 69.72.169.241, 209.131.36.100) are all public IP addresses assigned to organizations on the internet.

GPRS (General Packet Radio Service) is indeed a packet-based mobile data service on 2G and 3G cellular communication systems. It was a precursor to EDGE and 3G networks, enabling always-on internet access on mobile devices.

ARP (Address Resolution Protocol) maps IP network addresses to MAC hardware addresses, enabling devices on a local network to communicate. It's fundamental to how data reaches its destination.

Koobface (2008) specifically targeted social networking platforms, primarily Facebook and MySpace. It spread by sending fake links from infected accounts, tricking users into downloading malware. Conficker exploited Windows vulnerabilities. Daprosy worm targeted Yahoo Messenger. Stuxnet was a sophisticated cyberweapon targeting industrial control systems. Koobface's social engineering approach was unique to social networks.

PNG stands for Portable Network Graphics. It is a raster-graphics file-format that supports lossless data compression. The format was designed as an improved replacement for GIF. The other options have incomplete or incorrect variations of the name.

DTP stands for Desktop Publishing, the creation of documents using page layout software on personal computers. It refers to producing printed materials like newsletters, brochures, and books. The other options - Digital Transmission Protocol, Document Type Processing, and Data Type Programming - are not standard abbreviations for DTP.

SSL stands for Secure Socket Layer, a cryptographic protocol designed to provide secure communication over a computer network. It was the predecessor to TLS (Transport Layer Security) and operates at the transport layer to encrypt data.

To solve this question, the user needs to know the full form of GPRS.

The Answer is: D

Explanation:

GPRS stands for General Packet Radio Service. It is a wireless communication service that allows users to send and receive data packets over a cellular network. Option D correctly identifies the full form of GPRS. Option A is incorrect because GPRS does not involve remote systems for positioning. Option B is incorrect because GPRS does not use radio signals for positioning. Option C is almost correct, but it misidentifies the "P" in GPRS as "Position" instead of "Packet".