The Complete Guide to AWS Shield: Designing DDoS Protection with “Standard Protection + Advanced Protection + Operational Processes” (Compared with GCP Cloud Armor and Azure DDoS Protection)
Introduction: DDoS protection works through “design,” not just “subscription”
AWS Shield (hereafter “Shield”) is a protection service for defending AWS resources against DDoS attacks (distributed denial-of-service attacks). The official documentation states that Shield provides protection against a broad range of DDoS attack vectors, including known and zero-day attacks, that Shield Standard is automatically included when using AWS at no additional cost, and that Shield Advanced can be subscribed to for a higher level of protection.
The key point to understand here is that DDoS protection is not something you can “enable and forget.” It only becomes an effective mechanism when you decide which entry points to protect, who does what during an attack, and how much cost you are willing to tolerate. Shield functions primarily as network- and transport-layer DDoS protection, and its role differs from application-layer rule services such as WAF (since WAF is excluded from this request, this article focuses strictly on Shield design).
For comparison, GCP officially explains that Cloud Armor provides defense against both DDoS and application attacks, and that even Standard includes always-on protection against volumetric and protocol-based DDoS attacks.
Azure officially describes Azure DDoS Protection as providing always-on monitoring, real-time tuning, mitigation analysis, and automatic mitigation when attacks are detected.
1. What is AWS Shield? Choosing the “depth of defense” with Standard and Advanced
1-1. Shield Standard: the default baseline defense that comes built in
The official documentation clearly states that Shield Standard is automatically provided when you use AWS, at no additional cost.
This is an important premise: it means that when you use AWS, you already have a baseline layer of DDoS defense in place. At the same time, whether Shield Standard alone is sufficient depends on your business criticality, tolerated downtime, and expected attack risk.
1-2. Shield Advanced: an upper-tier plan for stronger protection and operational support
The same official page explains that you can subscribe to Shield Advanced for a higher level of protection.
In reality, the decision to adopt Advanced should not be based on “because we might be attacked,” but on how much business impact you want to suppress if an attack happens, and how far you are prepared to build out your operational response structure.
2. What are you protecting against? Understand the “layers” of DDoS and decide the entry points
Shield documentation lists attack classes it detects, such as network volumetric attacks (Layer 3).
What this tells us is that Shield is primarily focused on infrastructure-layer (L3/L4-oriented) DDoS.
What matters operationally is organizing your “entry points.” These are typically classified like this:
- Global entry points (CDN or global delivery)
- Regional entry points (load balancers, public IPs)
- Direct exposure (services provided directly via a specific public IP)
Where Shield “applies” depends on where in your architecture traffic is first received. The more entry points you have, the more places you must protect, and the more complicated operations become. In DDoS defense, a very effective strategy is to first reduce (or consolidate) the number of entry points.
3. Shield Advanced pricing: mainly a monthly fixed fee plus transfer-related usage charges
The Japanese Shield Advanced pricing page gives an example monthly fee of 3,000 USD, and also explains with examples that metered charges for “Shield Advanced data transfer out” may apply. For example, if an ALB has 1,000 GB of inter-region outbound data transfer, the example shows an additional per-GB charge on top of the monthly 3,000 USD.
From this pricing structure, the main design takeaways boil down to two points:
- Advanced is a model where you pay a fixed cost to strengthen protection (so it is important to narrow it down to entry points worth protecting)
- For workloads with high data transfer, usage-based charges may matter (so transfer design also affects cost)
In other words, Advanced is not simply “expensive” or “cheap.” The right decision is to compare the loss if that service goes down against the acceptable level of fixed + metered cost.
4. Practical design: three viewpoints for making Shield actually “work”
4-1. Viewpoint 1: prioritize what to protect (the courage not to protect everything equally)
If you try to protect every resource at the same level, your DDoS strategy will often collapse under cost and operational complexity. A practical order of priority is:
- Entry points directly tied to revenue and trust (payments, login, purchasing, etc.)
- Entry points necessary for business continuity (admin panels, core APIs, etc.)
- Everything else (things that would hurt if they failed, but are not immediately fatal)
If you decide first “what really hurts if it goes down,” your Shield Advanced decision and your operational design become much more stable.
4-2. Viewpoint 2: operations during an attack (who looks at what?)
Shield operates in a world where attacks are “automatically mitigated,” but what matters operationally is understanding the situation and communicating with stakeholders. During an attack, what you need is to distinguish things like:
- Is this DDoS, sudden popularity/traffic spike, or an internal outage?
- Is the entry point alive, and what is the latency?
- How far does the impact spread?
In DDoS defense, “organization” often matters more than technology, so deciding on-call roles and communication paths in advance makes you much stronger when a real attack happens.
4-3. Viewpoint 3: post-recovery learning (improving the design)
A common trap after an attack is: “it settled down, so let’s move on.” In practice, resilience improves significantly just by always reviewing the following after recovery:
- Was entry-point consolidation done properly (or were there unnecessary exposed endpoints)?
- What hurt more than expected (communication, decision-making, logs, metrics)?
- Was the fixed/metered cost worth it (does the original decision need to be revisited)?
5. Common mistakes and how to avoid them
5-1. Entry points are scattered, so protection can’t be fully applied
If you have multiple public IPs and entry points are not unified under load balancers or CDNs, DDoS protection becomes much harder. The basic step is to centralize entry points and narrow the places that must be defended.
5-2. Misunderstanding “Advanced = universal protection”
Shield Advanced is powerful, but it does not solve all application-layer issues (poor API design, expensive search endpoints, login abuse, etc.). Misunderstanding the layer of protection leads to misplaced operational focus.
5-3. Forgetting that the cost continues as a “fixed expense”
Advanced is centered on a monthly fixed fee. In organizations where budget justification matters, adoption is less contentious if you document the reasons for adopting it (business impact, customer requirements, tolerated downtime) and assume that it will be reviewed regularly.
6. Comparison with GCP Cloud Armor: even Standard clearly includes “always-on DDoS protection”
Cloud Armor is described as a network security service that provides defense against DDoS and application attacks.
In addition, the official Enterprise overview explicitly states that Cloud Armor Standard includes “always-on protection against volumetric and protocol-based DDoS attacks (automatic inline mitigation, no latency impact).”
From this, the key comparison points are:
- AWS positions Shield Standard as a “baseline defense automatically included,” with Advanced as an additional choice for stronger protection and operations
- GCP explicitly organizes Cloud Armor Standard as including “always-on DDoS protection”
That is a difference in how the service is presented.
But the operational essence is the same: which entry points you protect, how you protect them, and how you run operations around them. Regardless of cloud, entry-point consolidation and operational process design remain universally effective.
7. Comparison with Azure DDoS Protection: always-on monitoring and automatic tuning are emphasized
Azure DDoS Protection’s overview explains that it provides always-on traffic monitoring, adaptive real-time tuning, and DDoS mitigation analytics, and that mitigation begins automatically as soon as an attack is detected.
It also characteristically mentions that an automatically tuned mitigation policy is applied per protected public IP resource, and that attack analytics and mitigation flow logs can be streamed.
Compared with AWS Shield, this leads to the following contrast in framing:
- AWS: Standard is automatically included, and Advanced raises the protection level when needed
- Azure: the description emphasizes always-on monitoring, automatic tuning, and analytics as core qualities of DDoS Protection
If you want to standardize across multiple clouds, the following comparison axes tend to be the most stable:
- Scope of automatic mitigation (which entry points, which layers)
- Operational visibility (what can be seen during and after an attack)
- Pricing model (fixed + usage, usage-centric, per-entry-point, etc.)
- Organization (response flow and responsibilities during attacks)
8. A “deployment checklist” you can use starting today
Finally, here are the things that make later life easier if decided within the first one to two weeks of introducing or strengthening Shield.
- Inventory your entry points (protection targets)
- What is publicly exposed, and can it be unified?
- Prioritization
- List the three entry points that would hurt most if they went down
- Whether Shield Advanced is necessary
- Is it worth paying a fixed fee to protect this, and can you explain that in terms of business impact?
- Operational flow during an attack
- Who decides, who gets notified, and what gets checked?
- Post-recovery review items
- Entry-point consolidation, visibility, cost, and operational improvement points
Even just doing this transforms DDoS protection from a “vague anxiety” into a concrete design and operations problem that a team can handle.
Conclusion: Shield is completed by “standard foundation + necessary strengthening + operational process”
AWS Shield officially provides protection against a broad range of DDoS attack vectors, including known and zero-day attacks. Shield Standard is automatically included with AWS usage at no extra charge, and Advanced can be selected for stronger protection.
Shield Advanced pricing is clearly structured around a monthly fixed fee (example: 3,000 USD), with possible additional data-transfer-based usage charges depending on the design, which makes it relatively easy to evaluate adoption by comparing business impact and cost.
GCP explicitly states “always-on DDoS protection” in Cloud Armor Standard, while Azure emphasizes always-on monitoring, automatic tuning, and analytics in DDoS Protection.
However, the core reality is the same across all clouds: only when you combine entry-point consolidation, prioritization, an operational response flow, and post-recovery improvement does DDoS defense become truly strong in practice.
Reference links (mostly official)
- AWS Shield and Shield Advanced overview (official documentation)
- AWS Shield pricing (Japanese)
- GCP Cloud Armor Enterprise overview (includes always-on DDoS protection in Standard)
- GCP Cloud Armor overview
- Azure DDoS Protection overview (Japanese)
- Azure DDoS Protection overview (English)