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Mark McGuire

Tucson, AZ

Mark McGuire

Jr. IT Systems Administrator

Building robust systems with a security-first mindset.

01 — About

Background

I'm a Jr. IT Systems Administrator based in Tucson, AZ, with a passion for building and maintaining reliable infrastructure. I currently work for a charter school, keeping systems running smoothly and securely, and I'm genuinely grateful for the opportunity to support the education of the underprivileged and underserved youth that my organization focuses on.

Taking initiative in our environment's cybersecurity landscape was one of the most impactful decisions of my career; every task I tackled in that space deepened my interest in the field and set me on the path I'm on today.

When I'm not managing systems, I'm sharpening my security skills through hands-on labs, studying for certifications, and exploring the tools and techniques that define modern cybersecurity practice. I believe the best defense comes from truly understanding how systems work from the ground up.

02 — Capabilities

Skills & tooling

Frameworks & GRC

Currently studying
NIST RMFNIST SP 800-53 (Rev 5)CMMC 2.0FedRAMPFISMASTIG Implementation

Microsoft Cloud & Security

AzureSentinelDefender for Identity/EndpointEntra / IdentityIntunePurviewExchangeSharePointTeams Admin Center

Systems

Windows 10/11Active DirectoryGroup PolicySysmon

Security Tools

Familiar

WiresharkOpenVAS (GreenBone)Zenmap / NMapSyslogRDP

Some use

WazuhMetasploitBurp SuiteBloodHoundGoPhishEttercapHydraJohn the RipperDVWA

Systems & Infrastructure

Familiar

Hyper-VPDQ InventoryPDQ DeployTrack-IT (Ticketing)SCCM

Some use

ProxMox

Networking

Protocols & routing

OSPFeBGPHSRPBGP Path SelectionDHCP RelayNATNTPSSHFloating Static RoutesRoute Summarization

Switching & VLANs

Rapid PVST+STPVLANs802.1q TrunkingInter-VLAN RoutingLayer 3 SwitchingSVIs

Security

IPSec VPNIKEACLsDHCP SnoopingDynamic ARP InspectionWPA2Network SegmentationAccess ControlManagement Plane SecurityGuest Network IsolationPerimeter Security

Design & documentation

Hierarchical Network DesignCollapsed Core ArchitectureRedundancy DesignIP AddressingVLSMSubnettingNetwork DocumentationNetwork Troubleshooting

Hardware & tools

Cisco IOSCisco Catalyst 3650Cisco ISR RoutersPacket TracerWireless Network Configuration

Linux

Some use

LPI Linux EssentialsUbuntuKali LinuxApacheLAMP Stack

Programming & Automation

Most → least familiar
PythonHTMLCSSSQLPowerShellBash / ShellGit / GitHubAnsibleTerraformDocker

General

Customer SupportVerbal & Written CommunicationTechnical DocumentationAuditingStaff TrainingAsset Inventory ManagementChange ManagementVendor Management