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Prepare for your Red Hat Certified Engineer (RHCE) exam

System configuration and management

Use network teaming or bonding to configure aggregated network links between two Red Hat Enterprise Linux systems
Configure IPv6 addresses and perform basic IPv6 troubleshooting
Route IP traffic and create static routes
Use firewalld and associated mechanisms such as rich rules, zones and custom rules, to implement packet filtering and configure network address translation (NAT)
Configure a system to authenticate using Kerberos
Configure a system as either an iSCSI target or initiator that persistently mounts an iSCSI target
Produce and deliver reports on system utilization (processor, memory, disk, and network)
Use shell scripting to automate system maintenance tasks

Network services

Network services are an important subset of the exam objectives. RHCE candidates should be capable of meeting the following objectives for each of the network services listed below:

Install the packages needed to provide the service
Configure SELinux to support the service
Use SELinux port labeling to allow services to use non-standard ports
Configure the service to start when the system is booted
Configure the service for basic operation
Configure host-based and user-based security for the service

HTTP/HTTPS

Configure a virtual host
Configure access restrictions on directories
Deploy a basic CGI application
Configure group-managed content
Configure TLS security

DNS

Configure a caching-only name server
Troubleshoot DNS client issues

NFS

Provide network shares to specific clients
Provide network shares suitable for group collaboration
Use Kerberos to control access to NFS network shares

SMB

Provide network shares to specific clients
Provide network shares suitable for group collaboration

SMTP

Configure a system to forward all email to a central mail server

SSH

Configure key-based authentication
Configure additional options described in documentation

NTP

Synchronize time using other NTP peers

Database services

Install and configure MariaDB
Backup and restore a database
Create a simple database schema
Perform simple SQL queries against a database

DNS

Caching Domain Name Service (DNS)

DNS servers comes in several types such as master, slave, forwarding and cache, to name a few examples, with cache-only DNS being the one that is easier to setup. The cache-only DNS server is also known as resolver, which will query DNS records and fetch all the DNS details from other servers, and keep each query request in its cache for later use so that when we perform the same request in the future, it will serve from its cache, thus reducing the response time even more.

https://www.tecmint.com/install-configure-cache-only-dns-server-in-rhel-centos-7/

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/linux_domain_identity_authentication_and_policy_guide/trouble-gen-dns

HTTP/HTTPS