300-420 Free Practice Test

A branch office has a primary L3VPN MPLS connection back to the main office and an IPSEC VPN tunnel that serves as backup. Which design ensures that data is sent over the backup connection only if the primary MPLS circuit is down?

1. A. Use EIGRP to establish a neighbor relationship with the main office via L3VPN MPLS and the IPSECVPN tunnel.
2. B. Use BGP with the multipath feature enabled to force traffic via the primary path when available.
3. C. Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
4. D. Use OSPF with a passive-interface command on the backup connection.

Correct Answer: C

An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?

1. A. IPFIX
2. B. static telemetry
3. C. on-change subscription
4. D. periodic subscription

Correct Answer: A

Which design consideration must be made when dual vEdge routers are deployed at a branch site?

1. A. Use BGP AS-path prepending to influence egress traffic and use MED to influence ingress traffic from the branch.
2. B. HSRP priorities must match the OMP routing policy to prefer one vEdge over the other.
3. C. Traffic must be symmetrical as it egresses the vEdges and returns from remote sites for DPI to function properly.
4. D. Configure BFD between vEdge routers to detect sub-second link failures.

Correct Answer: A

A router running ISIS is showing high CPU and bandwidth utilization. An engineer discovers that the router is configured as L1/L2 and has L1 and L2 neighbors. Which step optimizes the design to address the issue?

1. A. Make this router a DIS for each of the interfaces
2. B. Disable the default behavior of advertising the default route on the L1/L2 router
3. C. Configure the router to be either L1 or L2
4. D. Configure each interface as either L1 or L2 circuit type

Correct Answer: D

An engineer is working with NETCONF and Cisco NX-OS based devices. The engineer needs a YANG model that supports a specific feature relevant only to Cisco NX-OS. Which model must the engineer choose?

1. A. Native
2. B. IEEE
3. C. OpenConfig
4. D. IETF

Correct Answer: D