Computer Networks

TCP/IP is the foundational protocol suite that enables all Internet communication. It's an open standard that efficiently handles data transmission across networks by breaking data into packets and routing them independently.

Nmap (Network Mapper) is the standard tool for port scanning and network discovery. It can identify open ports, running services, and operating systems on a target system. Wireshark and Etherial are packet analyzers for examining network traffic, not port scanning. A 'switch sniffer' is not a standard tool category.

When you access a website using HTTPS (secure HTTP), the browser connects to port 443 on the server. This is the standard port for HTTPS traffic, which uses SSL/TLS encryption to secure communications. Port 80 is for unencrypted HTTP, port 21 is for FTP, and port 139 is for NetBIOS file sharing.

HTTPS (Hypertext Transfer Protocol Secure) uses port 443 by default for encrypted web communication. Port 80 is used for standard HTTP, port 21 for FTP, and port 139 is used for NetBIOS. The 'S' in HTTPS indicates the secure version operating on the secure port.

Nmap (Network Mapper) is a security scanner specifically designed to discover hosts and services on a computer network, thus detecting open ports. When you know an IP address, running 'nmap ' will scan the target and list all open ports along with the services running on them. Wireshark and Etherial (now Wireshark) are packet analyzers for capturing network traffic, not port scanning. 'Switch sniffer' is not a standard tool name.

This is an exact duplicate of question 15181. Nmap (Network Mapper) is the correct tool for port scanning. It's designed specifically to discover open ports and services on network targets. Given an IP address, nmap scans the target and enumerates open ports with service detection. Wireshark (formerly Ethereal) is for packet capture and analysis, not port scanning. 'Switch sniffer' is not a recognized security tool.

HTTPS uses port 443 by default for secure, encrypted web communication. Port 80 is for standard HTTP, port 21 is for FTP, and port 139 is for NetBIOS session service. The 's' in HTTPS indicates a secure connection on port 443.

HTTPS (HTTP Secure) uses port 443 by default for encrypted web traffic. Port 80 is for standard HTTP, port 21 is for FTP, and port 139 is for NetBIOS session service. When you type 'https://' in a browser, it connects to port 443.

Nmap (Network Mapper) is the standard tool for port scanning and network discovery. It can identify open ports on a target system. Wireshark (formerly Etherial) is a packet analyzer for capturing and examining network traffic, not primarily for port scanning. 'Switch sniffer' is a generic term, not a specific tool.

192.168.1.100 is a local network IP address using the private IP range 192.168.0.0/16 defined in RFC 1918. Private IP addresses (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are used for local networks and are not routable on the internet. The other options (74.125.127.100, 69.72.169.241, 209.131.36.100) are public IP addresses assigned to internet-facing services.

An IP address is a unique numeric identifier assigned to each network adapter (NIC) that allows it to be recognized and communicate with other devices on a network. It does not identify the computer manufacturer (that's the vendor ID), the physical location (that's GPS/address), or none of the above.

An IP address is a fundamental requirement for any device to participate in a network. Whether connecting to a local router, a public Wi-Fi hotspot, or establishing a TCP connection for data exchange, the device must have a unique identifier to route traffic correctly.

TCP (Transmission Control Protocol) is a core internet protocol that provides reliable, ordered delivery of data between applications. XML is a markup language for data storage, RS232 is a serial communication hardware standard, and HTML is a markup language for web pages - none are network protocols.

CCSP (Cisco Certified Security Professional) is Cisco's certification for network security professionals. This certification validates skills in designing, implementing, and managing secure network infrastructures using Cisco security technologies.

IP PBX (Internet Protocol Private Branch Exchange) is the system that uses VoIP technology to route calls between users within an organization. Unlike traditional EPABX which uses analog lines, IP PBX operates over data networks using internet protocols.