Lesson 15 Total Cost of Ownership

What Drives TCO? Networks Grow in Size and Complexity Scope of Operations Increases Skilled IT labor grows scarce New applications require new solutions

What Drives TCO in Security? Vendors produce in-secure applications Vulnerabilities proliferate Business processes depend on applications System availability drives profit

Components to Consider Initial Cost of Product (25% of life cycle) Vendor Support Services Deployment Services Time for Staff to Install and Configure Training Cost Post Deployment Support

How to Reduce TCO? Simplify Infrastructure (KISS) Upgrade Infrastructure When Timing is Right Minimize Labor Intensive Activities Consider Remote Management Know Your Assessment Parameters

T C O Security Risk Option 3 Option 2 Option 1 HIGH Budget Line Acceptable Risk Ideal Soln LOW HIGH LOW Security Risk

Evaluating the Options FIREWALL At Gateway Only Option 2 DMZ Firewall Architecture Anti Virus Software on all DMZ machines Option 3 DMZ, AV S/W on DMZ Machines VPN Access to all DMZ Machines AV S/W and Firewalls on all Clients

Evaluating Architectures Option 1 - Screening Router Option 2 - Dual Homed Host Option 3 - Bastion Host Option 4 – Screened subnet (DMZ) Which one cost more relative to risk?

Option 1: Screening Router Internet Screening Router

Option 2: Dual-homed Host Dual-homed host Architecture Internet Dual-homed host

Option 3: Bastion Host Screened host Architecture Screening Router Internet X Screening Router Bastion Host

Option 4: Screened Subnet Screened subnet Architecture—aka DMZ Internet FIREWALL Exterior Router Perimeter Network Interior Router Internal Network

Assumptions Cost of Router: $3000 Cost of Firewall: $5000 Cost of Security Administrator--$75K/year Managed Security Service Provider(MSSP)--$24K/year

Things to Consider Which Option Would You Choose? Is cost the only driver? Could You Determine TCO for the different architectures? Given a Set of Devices Could You Compute TCO?

Difficulties with ROI Investment decisions based on ability to demonstrate positive ROI ROI traditionally difficult to quantify for network security devices Difficult to calculate risk accurately due to subjectivity involved with quantification Business-relevant statistics regarding security incidents not always available for consideration in analyzing risk

Option Cost—In-house Manpower cost constant: $75K Option 1 - Screening Router: $78K HW Cost: $3K (cost of 1 router) Option 2 - Dual Homed Host: $80K HW Cost: $5K (FW cost) Option 3 - Bastion Host: $83K HW cost: $8000 (router + FW) Option 4 – Screened subnet (DMZ): $86K HW cost: $11000 (2 routers + FW)

Option Cost—MSSP Manpower cost constant: $24K Option 1 - Screening Router: $27K HW Cost: $3K (cost of 1 router) Option 2 - Dual Homed Host: $29k HW Cost: $5K (FW cost) Option 3 - Bastion Host: $32K HW cost: $8000 (router + FW) Option 4 – Screened subnet (DMZ): $35K HW cost: $11000 (2 routers + FW)

Summary What Drives TCO? Reducing TCO Option Analysis Assumptions and Considerations Difficulties with ROI