300-420 Practice Test Questions

205 Questions


Which design consideration must be made when using IPv6 overlay tunnels?


A.

Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.


B.

Overlay tunnels should only be considered as a transition technique toward a
permanent solution.


C.

Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.


D.

Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.





B.
  

Overlay tunnels should only be considered as a transition technique toward a
permanent solution.



Explanation: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-
3s/ir-xe-3s-book/ip6-ip4-gre-tunls-xe.pdf
"The use of overlay tunnels should be considered as a transition technique toward a
network that supports both the IPv4 and IPv6 protocol stacks or just the IPv6 protocol
stack."

An engineer must design an in-band management solution for a customer with branch sites. The solution must allow remote management of the branch sites using management protocols over an MPLS WAN. Queueing is implemented at the remote sites using these classes:
How must the solution prioritize the management traffic over the WAN?


A.

Mark the traffic with DSCP CS1 and map into Class2 with a minimum bandwidth
assigned by reducing the bandwidth available to CIass3.


B.

Mark the traffic with DSCP CS6 and map into Class1 with a minimum bandwidth
assigned by reducing the bandwidth available to Class2


C.

Mark the traffic with DSCP EF and map into Class1 with a minimum bandwidth assigned
by reducing the bandwidth available to Class2.


D.

Mark the traffic with DSCP CS2 and map into Class2 with a minimum bandwidth
assigned by reducing the bandwidth available to Class3





C.
  

Mark the traffic with DSCP EF and map into Class1 with a minimum bandwidth assigned
by reducing the bandwidth available to Class2.



What is the function of the multicast Reverse Path Forwarding check?


A.

It allows for a loop-free distribution tree from the source to receivers.


B.

It serves as an Auto RP Mapping agent.


C.

It prevents bootstrap messages from reaching all routers.


D.

It is used to discover and announce RP-set information.





A.
  

It allows for a loop-free distribution tree from the source to receivers.



An engineer is designing a multicast network for a financial application Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?


A.

BIRDIR-PIM


B.

PIM-SM


C.

MSDP


D.

PIM-SSM





A.
  

BIRDIR-PIM



Which routes does the overlay management protocol advertise in an SD-WAN overlay?


A.

underlay, MPLS, and overlay


B.

primary, backup, and load-balanced


C.

prefix, TLOC, and service


D.

Internet, MPLS, and backup





C.
  

prefix, TLOC, and service



An engineer uses Postman and YANG to configure a router with:



A.

Option A


B.

Option B


C.

Option C


D.

Option D





D.
  

Option D



An architect is creating a migration strategy for a large organization in which the choice made by the application between IPv6 and IPv4 is based on the DNS request. Which migration strategy does the architect choose?


A.

AFT for public web presence


B.

host-initiated tunnels


C.

dual stack


D.

site-to-site IPv6 over IPv4 tunnels





C.
  

dual stack




Refer to the exhibit. Where must an architect plan for route summarization for the topology?


A.

from the core toward the aggregation and the access toward the aggregation


B.

from the core toward the aggregation and the aggregation toward the core


C.

from the aggregation toward the access and the access toward the aggregation


D.

from the aggregation toward the core and the aggregation toward the access





D.
  

from the aggregation toward the core and the aggregation toward the access




Refer to the exhibit. An engineer is designing an OSPF network for a client. Requirements
dictate that the routers in Area 1 should receive all routes belonging to the network,
including EIGRP, except the ones originated in the RIP domain. Which action should the
engineer take?


A.

Make area 1 a NSSA.


B.

Make area 1 a stub.


C.

Make area 1 a standard OSPF area.


D.

Make the area 1 routers part of area 0.





A.
  

Make area 1 a NSSA.



A customer’s environment includes hosts that support IPv6-only. Several of these hosts must communicate with a public web server that has only IPv4 domain name resolution. Which solution should the customer use in this environment?


A.

utilize NAT64 to translate the addresses


B.

Implement NAT44 at the edge of the customer network


C.

use 6to4 and a tunnel to translate the addresses


D.

implement 6PE to resolve hostname resolution





A.
  

utilize NAT64 to translate the addresses



Which topology within a network underlay eliminates the need for first hop redundancy
protocols while
improving fault tolerance, increasing resiliency, and simplifying the network?


A.

virtualized topology


B.

routed access topology


C.

Layer 2 topology


D.

logical fabric topology





D.
  

logical fabric topology



A company is running BGP on a single router, which has two connections to the same ISP. Which BGP feature ensures traffic is load balanced across the two links to the ISP?


A.

Multihop


B.

Multipath Load Sharing


C.

Next-Hop Address Tracking


D.

AS-Path Prepending





B.
  

Multipath Load Sharing




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