Cisco 300-415 Practice Test

300-415 practice test: what's covered

• Implementing Cisco SD-WAN Solutions

Free 300-415 sample questions

1. A new cEdge router powers on at a branch. Before it can join the SD-WAN overlay, it must reach exactly ONE controller first. Which controller MUST it reach FIRST, and why?

   • A. vManage — to download templates and configuration
   • B. vBond — it is the orchestrator that authenticates the edge and shares the vSmart/vManage IPs so the device can build control connections
   • C. vSmart — to receive OMP routes immediately
   • D. Any vEdge in the same site — to peer with via OMP
   Show answer

   Correct: B. vBond is the FIRST contact point. It authenticates the edge using certificates, validates against the controller whitelist, NATs the device through if needed, and then returns the vManage and vSmart IPs. Only after that does the edge build DTLS/TLS control connections to vSmart (for OMP) and vManage (for management). A common trap is choosing vManage because templates "come from there" — but you cannot reach vManage until vBond tells you where it is.

2. Which TWO statements correctly describe the role of vSmart in a Cisco SD-WAN fabric? (Choose 2)

   • A. vSmart is the OMP route reflector — it peers with every edge and propagates OMP routes, TLOCs, and service routes
   • B. vSmart forwards user data-plane traffic between sites
   • C. vSmart distributes centralized control policy and data policy to edges
   • D. vSmart terminates IPsec tunnels from branches
   • E. vSmart is the orchestrator that performs initial device authentication
   Show answer

   Correct: A and C. vSmart sits in the control plane only — it never carries user data. It is the OMP route reflector and the policy distribution point for centralized control/data policy. Data tunnels are built edge-to-edge (IPsec/GRE), bypassing vSmart entirely. vBond is the orchestrator. Confusing vSmart with a data-plane device is the classic ENSDWI trap.

3. Examine the following vManage CLI output from a cEdge: <pre>cEdge# show sdwan control connections PEER PEER SITE DOMAIN PEER TYPE PROT ID ID SYSTEM IP STATE vbond dtls 0 0 0.0.0.0 up vmanage dtls 100 1 10.0.0.1 up vsmart dtls 100 1 10.0.0.2 up vsmart dtls 100 1 10.0.0.3 up</pre> What does this confirm about the device?

   • A. The device is in a healthy control-plane state with redundant vSmart connections and one vManage/vBond connection each
   • B. The device is missing a connection — vBond should show Site ID 100
   • C. There are too many vSmarts; this indicates a misconfiguration
   • D. The device cannot forward traffic because there are two vSmarts
   Show answer

   Correct: A. vBond intentionally uses Site ID 0 (it is not a participant in any overlay site). Two vSmart connections are NORMAL and recommended for redundancy — by default each edge connects to a maximum of 2 vSmarts (controllable via "max-omp-sessions"). One vBond + one vManage + two vSmarts is the textbook healthy state.

4. An ENSDWI candidate is asked: "What protocol does OMP run over between edges and vSmart?" Pick the BEST answer.

   • A. BGP TCP/179
   • B. A proprietary protocol carried inside the DTLS or TLS control connection to vSmart
   • C. OSPF area 0
   • D. EIGRP using TLV 0x10
   Show answer

   Correct: B. OMP (Overlay Management Protocol) is BGP-like in concept but is a separate protocol that runs INSIDE the DTLS (default) or TLS tunnel to vSmart. It carries OMP routes (prefixes), TLOC routes (transport locators), and service routes. Many students answer "BGP" because OMP behaves like BGP with route reflectors — that is the trap.

5. In a Cisco SD-WAN overlay, what is the function of the System IP?

   • A. It is the transport-side public IP used to terminate IPsec
   • B. It is a unique, persistent, logical loopback-like identifier for the device in the overlay — it does not change with transport, never carries user traffic, and identifies the device across all OMP advertisements
   • C. It is the IP used by clients as their default gateway
   • D. It is the IP assigned by DHCP to the WAN interface
   Show answer

   Correct: B. System IP is the overlay-wide identity of the device. It is conceptually a loopback that NEVER appears on a physical interface or carries user traffic. Each edge has exactly one System IP. Confusing System IP with a transport IP or with Site ID is the most common architecture trap.

Last updated: 2026-10-19

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