Refresher on 5 network protocols in Red Hat Enterprise Linux (RHEL).
IP (Internet Protocol)
Purpose: Routing and addressing packets between systems.
Commands:
ip addr show
nmcli device show
TCP/UDP (Transmission Control Protocol / User Datagram Protocol)
Purpose: Transport layer protocols for communication.
RHEL uses TCP/UDP for most services (SSH, HTTP, DNS, etc.).
DNS (Domain Name System)
Purpose: Resolves domain names to IP addresses.
Tool:
dig, nslookup
SSH (Secure Shell)
Purpose: Secure remote login.
RHEL uses sshd as the default remote access method.
Service: sshd (systemctl status sshd)
Port: TCP 22
HTTP/HTTPS
Purpose: Web communication.
Relevance: RHEL often serves web pages using httpd (Apache) or nginx.
Packages: httpd, nginx
