Which characteristic applies to a traditional WAN solution but not to a Cisco Catalyst SD-WAN...

The correct answer is B. Time-consuming configuration and maintenance .

In a traditional WAN architecture , configurations are typically performed manually on each device (router-by-router basis) . This leads to:

Increased operational overhead

Slower deployment times

Higher chances of configuration inconsistency

Difficult scalability

According to Cisco ENCOR (350-401) architecture principles, traditional WANs lack centralized orchestration, making configuration and maintenance time-consuming and complex .

In contrast, Cisco Catalyst SD-WAN introduces:

Centralized management and control (via vManage, vSmart, vBond)

Policy-based automation

Zero-touch provisioning (ZTP)

Simplified operations and faster deployment

Now, why the other options are incorrect:

A. Centralized reachability, security, and application policies → This is a defining feature of Cisco SD-WAN , not traditional WAN.

C. Low complexity and increased overall solution scale → SD-WAN is specifically designed to reduce complexity and improve scalability .

D. Operates over DTLS/TLS-authenticated and secured tunnels → Cisco SD-WAN uses secure control connections (DTLS/TLS) , which is not a characteristic of traditional WAN .

Final Concept (ENCOR Exam Focus):

Traditional WAN = Manual, complex, time-consuming

Cisco SD-WAN = Centralized, automated, scalable, secure