Cisco CCNP Enterprise 300-420 Questions & Answers

• Question 21:

  Refer to the exhibit.

  

  An engineer is planning an IPv4 to IPv6 migration solution for a customer. The routers in the network can support IPv4 and IPv6, except for the DWDM routers. The DWDM routers provide a Layer 2 link in which the routers peer directly with each other across a DWDM circuit. The circuit also provides connectivity between the mail servers. Which IPv6 migration technique must the engineer deploy?

  A. dual-stack

  B. 6to4

  C. ISATAP

  D. 6rd

  Correct Answer: C

• Question 22:

  Refer to the exhibit.

  

  A network engineer must design a BGP solution based on:

  The route reflector must have one or more direct physical connections to the core routers (R3 and R4).

  The route reflector must have full redundancy and avoid a single point of failure.

  R2 to R1 link utilization is 90%. and the remaining links are less than 50% utilized.

  Which two solutions must the design Include?(Choose two.)

  A. Configure R1 to be a client of R2 and R4.

  B. Configure R2 to be a client of R1 and R4.

  C. Configure R3 to be a client of R2 and R4.

  D. Configure R4 to be a client of R1 and R3.

  E. Configure R5 to be a client of R3 and R4.

  Correct Answer: BE

• Question 23:

  Which function does the Cisco SD-Access intermediate node perform?

  A. Act as LISP proxy tunnel router.

  B. Route and transport IP traffic.

  C. Act as an anycast Layer 3 gateway.

  D. Map users to a virtual network.

  Correct Answer: B

• Question 24:

  Which WAN connectivity technology is optimal for edge computing compared to others and why?

  A. Due to low latency, high bandwidth, and closest proximity to the user. 4G/5G connectivity is the optimal WAN technology for edge computing compared to L3 VPN MPLS connectivity, which offers native separation and security with close proximity to the data center.

  B. Due to high bandwidth, separation and security, and proximity to the data center network. DWDM Is the optimal WAN technology lor edge computing compared to 4G/5G connectivity, which offers native separation and security with close proximity to the data center.

  C. Due to low latency, high bandwidth, and closest proximity to the user, L3 VPN MPLS connectivity is the optimal WAN technology for edge computing compared to 4G/5G connectivity, which offers native separation and security with close proximity to the data center.

  D. Due to low cost, high bandwidth, low latency, and closest proximity to the edge of the network, Mero Ethernet is the optimal WAN technology for edge computing compared to MPLS, which offers native separation and security with close proximity to the data center.

  Correct Answer: A

• Question 25:

  Refer to the exhibit.

  

  An engineer must design an address translation solution to provide Internet connectivity for the corporate network. The design Is restricted to the 172.16.168.0/22 subnet. Which solution must the engineer choose?

  A. stateful NAT64

  B. stateless NAT64

  C. stateful NAT66

  D. stateless NAT66

  Correct Answer: C

• Question 26:

  Which function do reverse path forwarding mechanisms perform in a multicast deployment?

  A. They notify the upstream routerof multicast traffic.

  B. They send PIM prune message toward multicast sources.

  C. They eliminate overlapping multicast addresses.

  D. They prevent loops and duplicate packets.

  Correct Answer: D

  Explanation: Reverse path forwarding (RPF) mechanisms are used to prevent loops and duplicate packets in multicast deployments [1]. The RPF check verifies that all multicast traffic received on a router is sourced from the expected direction, ensuring that multicast traffic is not looped back in the network. The RPF check works by comparing the source IP address of a multicast packet with the routing table, and only forwarding it if it matches the expected entry.

• Question 27:

  Refer to the exhibit.

  

  An engineer Is designing a multicampus Layer 3 Infrastructure using EIGRP as the routing protocol. The design must provide quick replies to queries. In the event of a downlink, prevent unnecessary queries, and ensure that traffic does not unnecessarily transit the access layer. Which two actions must the engineer take for the network design? (Choose two.)

  A. Configure core layer switches as stub routers.

  B. Configure distribution layer switches to summarize routes to the core layer.

  C. Configure access layer switches as stub routers.

  D. Configure access layer and core layer switches as stub routers.

  E. Configure access layer switches to summarize routes to the distribution layer.

  Correct Answer: BC

• Question 28:

  Refer to the exhibit.

  

  An engineer Is designing a redistribution solution for a customer. The customer recently acquired another company and decided to integrate the new network running RlPv1 with the company's existing network. Which redistribution technique must the engineer select to ensure the multipoint two-way redistribution does not cause routing loops?

  A. distribute-lists inbound under the EIGRP process denying RIPv1 learned prefixes

  B. distribute-lists outbound under the EIGRP process denying RIPv1 learned prefixes

  C. distribute-lists outbound under the RIPv1 process denying EIGRP learned prefixes

  D. distribute-lists inbound under the RIPv1 process denying EIGRP learned prefixes

  Correct Answer: A

• Question 29:

  What is the purpose of a TLOC extension in a Cisco SD-WAN network fabric?

  A. to facilitate WAN Edge router redundancy within a site

  B. to identify the physical interface where a WAN Edge router connects to the WAN transport network

  C. to expand the number of colors that are potentially applied to a network transport interface

  D. to aggregate multiple physical interfacesinto a single logical Interface

  Correct Answer: A

• Question 30:

  In a Cisco SD-Access fabric, which node facilities connectivity between the fabric and networks external to the fabric?

  A. intermediate

  B. edge

  C. control plane

  D. border

  Correct Answer: D