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sshd: OpenSSH Daemon
sshd is the OpenSSH server daemon, providing secure, encrypted communication for remote systems. It listens for connection requests from SSH clients, handles user authentication and session management, enabling features like remote logins, file transfers (SCP, SFTP), and port forwarding.
sshfs: Mount Remote File Systems via SSH
sshfs is a client that allows you to mount a directory from a remote server onto your local file system using the SSH File Transfer Protocol. This enables you to browse and edit remote files as if they were on a local disk. It operates based on FUSE (Filesystem in Userspace).
systemd-resolve: DNS Name Resolution and Cache Management
systemd-resolve is the client for the systemd-resolved service, handling DNS, LLMNR, and mDNS name resolution requests and managing its cache. It is used to diagnose and control the system's name resolution behavior.
tcpdump: Network Traffic Dump and Analysis
tcpdump is a powerful command-line utility for capturing and analyzing TCP/IP and other packets transmitted over a network interface. It allows you to filter packets based on specific criteria, display them in real-time, or save them to a file for later analysis. It is widely used for network troubleshooting, security auditing, and application debugging.
Complete Guide to the Telnet Command
`telnet` is a network protocol and command that allows you to connect to a remote host, open a terminal session, and execute commands. Due to security vulnerabilities, it is primarily used to check if specific ports on network devices are open. SSH (Secure Shell) is the modern secure protocol that replaces telnet.
traceroute: Trace Network Path
The traceroute command traces the route packets take to a network host and measures the transit delays of the packets through the Internet protocol. It is useful for diagnosing network problems and analyzing paths.
wget: Download Files from the Web
wget is a non-interactive network downloader that retrieves files from the web using HTTP, HTTPS, and FTP protocols. It can run in the background and offers powerful features like resuming interrupted downloads.
whois: Domain and IP Information Lookup
whois is a command used to query registration information for internet domain names or IP addresses. It allows you to check various details such as domain owner, registrar, registration date, expiration date, and nameservers.