300-420 practice questions 171–180

1. Question 171 · 359 in bank

   Refer to the exhibit.

   

   Which two points in the network must an engineer configure the ports for explicit trust when using a DiffServ model?

   • AB and E
   • BF and G
   • CA and D
   • DC and D

   Show answer

   Answer: B

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2. Question 172 · 359 in bank

   Select 2

   What are two advantages of the Cisco SD-WAN technology? (Choose two.)

   • Aeasier deployment
   • Bimproved application experience
   • Coptimized cloud connectivity
   • Dconsistent connectivity
   • Eproactive network management

   Show answer

   Answer: BC

   References

   • Cisco documentation

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3. Question 173 · 359 in bank

   Refer to the exhibit.

   

   Which process does the Ethernet LMI protocol follow that is defined by the MEF 16 Technical Specification?

   • Abroadcasts multicast network routes from the CE to the PE
   • Bnotifies the CE of the availability state of a configured EVC
   • Ccommunicates ENI and EVC attributes to the CE
   • Dbroadcasts to all subnets from the CE when an EVC is added

   Show answer

   Answer: B

   References

   • Cisco documentation

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4. Question 174 · 359 in bank

   Select 2

   A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single AS, and auto-summarization is disabled. Which two actions must the company choose? (Choose two.)

   • ASplit the network into two separate ASs.
   • BExchange all routes between locations.
   • CSummarize the routes between the hubs.
   • DMake each spoke site router a stub router.
   • ESummarize the routes from spokes to the hubs.

   Show answer

   Answer: DE

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5. Question 175 · 359 in bank

   What is the purpose of the RPF check in multicast routing?

   • Ato ensure that multicast packets are forwarded if they arrived on the interface used to route traffic back to the source address
   • Bto ensure that multicast packets are dropped if they arrived on the interface used to route traffic to the destination address
   • Cto ensure that multicast packets are forwarded if they arrived on the interface used to route traffic to the destination address
   • Dto ensure that multicast packets are dropped if they arrived on the interface used to route traffic back to the source address
   • Eto ensure that multicast packets, no matter the interface they arrived on, are forwarded out all interfaces

   Show answer

   Answer: A

   Explanation

   Reverse Path Forwarding (RPF) is a fundamental check in multicast routing. It ensures that a router only accepts and forwards a multicast packet if the interface on which it arrived is the same interface the router would use to send unicast traffic back to the source of that packet. If the packet arrives on any other interface, the router discards it. This prevents routing loops and duplicates in multicast forwarding.

   Source: Adapted from community discussion — friscowaverider

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6. Question 176 · 359 in bank

   An engineer is creating a design to enable IPv6 to run on an existing IPv4 IS-IS network. The IPv4 and IPv6 topologies will match exactly, and the engineer plans to use the same IS-IS router levels for each protocol per interface. Which IS-IS design is required?

   • Amulti topology without enabling transition feature
   • Bmulti topology with transition feature enabled
   • Csingle topology without enabling transition feature
   • Dsingle topology with transition feature enabled

   Show answer

   Answer: C

   Explanation

   I would say C as both IPV4 and IPV6 are sharing the exact same topology. No need of multipology nor transition mode: https://www.ws.afnog.org/afnog2011/are/ipv6-presentations/4-isis-for-ipv6.pdf

   Source: Adapted from community discussion — Gabi512

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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7. Question 177 · 359 in bank

   Which feature of Cisco SD-WAN Secure Direct Cloud Access divides user traffic into different zones and VPNs or VRFs?

   • Aapplication-awareness routing
   • Bperimeter control
   • Ccentralized data policy
   • Dsecure segmentation

   Show answer

   Answer: D

   References

   • Cisco documentation
   • Cisco documentation

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8. Question 178 · 359 in bank

   A company wants to deploy IPv6 within its existing network infrastructure. All current infrastructure equipment supports IPv6, and the company wants a migration strategy that must not require purchasing additional equipment. The plan must keep operational management costs low, support IPv6 multicast, and allow applications to migrate using DNS. Which strategy must the company choose?

   • Ahybrid ISATAP tunnel model
   • Bhybrid manual tunnel model
   • Cdual-stack model
   • Dservice block model

   Show answer

   Answer: C

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9. Question 179 · 359 in bank

   An engineer is designing a QoS solution for a customer. The customer's internet connection has a bandwidth of 10 Mbps. The design must ensure that traffic bursts of data do not exceed the bandwidth of the connection and that received traffic does not starve out business-critical traffic. Which solution must the engineer choose?

   • AConfigure the queuing default queue for shaping inbound and policing inbound.
   • BConfigure the queuing default queue for shaping inbound and policing outbound.
   • CConfigure the queuing default queue for shaping outbound and policing inbound.
   • DConfigure the queuing default queue for shaping outbound and policing outbound.

   Show answer

   Answer: C

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10. Question 180 · 359 in bank

    Which security functionality does gRPC provide?

    • Aenabling RC6 data-level encryption with CRC check
    • Bmandatory encryption of data at rest using the AES and RSA protocols
    • Cimplementing secure server-client tunnels with RSA 2048 cipher encryption
    • Dsupporting secure communication between network devices and control systems using TLS and HTTPS

    Show answer

    Answer: D

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300-420 practice, question 171. 359 questions available.