Level 2
CompTIA Linux+ Level 2 progression articles for intermediate technicians.
Email filtering with Sieve, Rspamd, and spam control
Set up Sieve-based mail filtering, integrate Rspamd with Postfix for spam control, configure DKIM signing, Bayesian...
Dovecot IMAP and POP3: mailbox delivery and client access
Configure Dovecot for IMAP and POP3 access with TLS, authentication backends, LMTP delivery, quotas, shared mailboxes,...
Postfix mail server: installation, configuration, and relay control
Install and configure Postfix with TLS, SASL authentication, relay restrictions, virtual domains, and production-grade...
Linux email architecture: MTA, MDA, MUA, and protocols explained
Understand the full email delivery chain on Linux: MTA, MDA, and MUA roles, SMTP/IMAP/POP3 with encryption, DNS records...
Linux routing, NAT, and packet forwarding
Set up policy routing, SNAT/DNAT/MASQUERADE with nftables, GRE tunnels, and multi-table routing on Linux, with...
Network troubleshooting with tcpdump, ss, nmap, and traceroute
Master network diagnostics using tcpdump packet capture, ss socket inspection, nmap scanning, traceroute path analysis,...
Advanced network configuration: bonding, bridging, and VLANs
Configure NIC bonding modes, Linux bridges for VMs and containers, 802.1Q VLANs, and team devices using nmcli and...
TCP/IP stack deep dive: protocols and Linux network internals
Explore the Linux TCP/IP stack from socket buffers to netfilter hooks, covering protocol internals, /proc/sys/net...
Device mapper and storage virtualization on Linux
Understand the device mapper framework underpinning LVM, dm-crypt, and dm-cache. Explore dmsetup, Stratis as a modern...
Advanced LVM: thin provisioning, snapshots, and migration
Go beyond basic LVM with thin pools, over-provisioning, snapshot workflows, pvmove for live migration, dm-cache for SSD...
iSCSI storage on Linux: targets, initiators, and multipath
Configure iSCSI block storage on Linux using targetcli and open-iscsi, set up CHAP authentication, persistent mounts,...
Linux software RAID with mdadm: setup, management, and recovery
Build and manage Linux software RAID arrays with mdadm covering RAID 0/1/5/6/10, disk replacement, array growth, bitmap...