Once an endpoint is taken on the internal network, an attacker may walk from a printer to a server, from shares to a domain controller. Internal network security testing (internal pentest) simulates that walk under an authorized scenario through segmentation, identity, shares, and management protocols. An office move, guest network, merger, or a large VPN-from-home fleet raises the need. An external pentest may show a locked door while weak passwords and unbounded VLANs remain inside. The work needs a window and a deny-list so production is not disrupted.
TARGON designs internal pentest in the same technical frame as Active Directory, system deployment, and security-product knowledge. VLAN, accounts, and hours are made explicit; lateral-movement findings are written as closable architecture advice, not a game score. If a full red team scenario is wanted, that scope is grown separately; internal network testing does not replace it. Taking internal pentest from TARGON keeps authorized-test discipline and later AD/system remediation on the same table.