300-420 Free Practice Test

When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

1. A. encapsulation of traffic with GRE or VTI
2. B. IPsec forwarding using transport mode
3. C. additional bandwidth for headend
4. D. IPsec forwarding using tunnel mode

Correct Answer: A

An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?

1. A. shaping
2. B. WRED
3. C. policing
4. D. RED

Correct Answer: A

An engineer is designing an enterprise campus network. The LAN infrastructure consists of switches from multiple vendors, and Spanning Tree must be used as a Layer 2 loop prevention mechanism. All configured VLANs must be grouped in two SIP instances. Which standards-based Spanning Tree technology supports this design solution?

1. A. MSTP
2. B. RSTP
3. C. Rapid PVST
4. D. STP

Correct Answer: A

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