300-420 practice questions 91–100

1. Question 91 · 359 in bank

   A company needs to increase access port capacity on one floor of a building. They want to leverage the existing catalyst access switch. There is no problem with uplink bandwidth capacity. However, no additional uplinks can be added because no ports are available on the distribution switches. Which solution must the company choose to provide additional access ports?

   • AVDC
   • BVSS
   • CEtherchannel
   • DStackwise

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   Answer: D

   Explanation

   The question is referencing access switches though, not distribution switches. Both solutions could work, but VSS requires exiting interfaces to be available on the switch, and the question states that the access switch ports have been exhausted.

   Source: Adapted from community discussion — Based_Engineer

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2. Question 92 · 359 in bank

   Which queuing structure is used on SD-WAN Edge routers?

   • AFIFO
   • BLLQ+WFQ
   • C1P-4Q-2T
   • DPriority

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   Answer: B

   Explanation

   https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/qos/vEdge-20-x/qos-book/forwarding-qos.html On Cisco vEdge devices and Cisco IOS XE SD-WAN devices, each interface has eight queues, which are numbered 0 to 7. Queue 0 is reserved, and is used for both control traffic and low-latency queuing (LLQ) traffic. For LLQ, any class that is mapped to queue 0 must also be configured to use LLQ. Queues 1 to 7 are available for data traffic, and the default scheduling for these seven queues is weighted round-robin (WRR). For these queues, you can define the weighting according to the needs of your network. When QoS is not configured for data traffic, queue 2 is the default queue. LLQ+WRR - but no such option.

   Source: Adapted from community discussion — [Removed]

   References

   • Cisco documentation
   • Cisco documentation

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3. Question 93 · 359 in bank

   Since installing a cisco TelePresence system, the company is experiencing other application having response issues when the system in use. As a result, the company asked an architect to recommend a QoS solution. The customer is currently using a CBWFQ policy to manage traffic on an internet connection with a speed of 100 Mbps. Which link-capacity limit must the architect choose for strict-priority for the real-time traffic?

   • A25 Mbps
   • B50 Mbps
   • C33 Mbps
   • D75 Mbps

   Show answer

   Answer: C

   Explanation

   The recommended link-capacity limit for strict-priority real-time traffic in a QoS solution is typically one-third (33%) of the available bandwidth. This is because allocating too much bandwidth to real-time traffic could lead to congestion for other types of traffic. In this case, the internet connection has a speed of 100 Mbps, so the architect should choose: C. 33 Mbps

   Source: Adapted from community discussion — SpicyMochi

   References

   • Cisco documentation

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4. Question 94 · 359 in bank

   Select 2

   

   Refer to the exhibit. All routers currently reside in OSPF area 0. The network manager recently used R1 and R2 as aggregation routers for remote branch locations and R3 and R4 as aggregation routers for remote office locations. The network has since been suffering from outages, which are causing frequent SPF runs. To enhance stability and introduce areas to the OSPF network with the minimal number of ABRs possible, which two solutions should the network manager recommend? (Choose two.)

   • Aa new OSPF area for R1 and R2 connections, with R1 and R2 as ABRs
   • Ba new OSPF area for R3 and R4 connections, with R5 and R6 as ABRs
   • Ca new OSPF area for R3 and R4 connections, with R3 and R4 as ABRs
   • Da new OSPF area for R1, R2, R3, and R4 connections, with R1, R2, R3, and R4 as ABRs
   • Ea new OSPF area for R1 and R2 connections, with R5 and R6 as ABRs

   Show answer

   Answer: BE

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5. Question 95 · 359 in bank

   A company plans to transition to IPv6. They will link their IPv4 addresses to the lowest significant bits of the new Ipv6 addresses. A network administrator with an employee id: 4264:42:116 is preparing a mapping schema for the new IPv6 addresses. Which address does the 172.16.10.0/24 network translate to?

   • A2001:db8:abcd::ac10:a00/120
   • B2001:db8:abcd:172:16:10::/96
   • C2001:db8:abcd:11d8:a00/120
   • D2001:db8:ac10:0a00::/64

   Show answer

   Answer: A

   Explanation

   " link their IPv4 addresses to the lowest significant bits " THis can never be a /64 network but must me a /120 network.

   Source: Adapted from community discussion — Reinier_veen

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6. Question 96 · 359 in bank

   An engineer must peer with an ISP for internet connectivity using BGP, initially, the engineer wants to receive only specific prefixes from the ISP and a default route. However, the solution must provide the flexibility to add prefixes in the future at short notice. The ISP has a two-week change process in place. Which route filtering solution must the engineer employ?

   • ARequest a limited internet routing table and a default route from the ISP and configure the BGP max-limit to 1 with an access list that permits only the specific internet prefixes and blocked networks
   • BRequest only the required prefixes and default route be advertised from the ISO with whitelisted networks
   • CRequest a full internet routing table and a default route from the ISP and configure inbound route filtering with a prefix list that permits the default route and required prefixes
   • DConfigure outbound route filtering on the enterprise and ISP so that the enterprise tell the ISP which prefixes are required

   Show answer

   Answer: C

   Explanation

   Shouldn't this be Answer: C? "However, the solution must provide the flexibility to add prefixes in the future at short notice." We ask for everything from the ISP + filter the specific routes we need -> And later on if we want more routes we just include them in the filter and boom, we can have any route in 5 minutes (But if we go with Answer D, we would need to contact the ISP every time, we would want them to modify their "outbound filter" to provide us more routes etc...) and that would take alot of time

   Source: Adapted from community discussion — Sickcnt

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7. Question 97 · 359 in bank

   DRAG DROP - Drag and drop the steps WAN Edge performs when on-boarded into the Cisco SD-WAN overlay from the left into the order they are completed on the right. Select and Place:

   

   This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

   Show the answer figure

   Answer: See figure below

   References

   • Cisco documentation

   

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8. Question 98 · 359 in bank

   In a cisco SD-Access brownfield deployment scenario, which configuration deployment must be taken with Cisco DNA center?

   • ASubnet stretching
   • BLAN automation
   • CAutomated UNDERLAY
   • DManual underlay

   Show answer

   Answer: D

   Explanation

   In a brownfield deployment scenario, the deployment of the underlay network must be taken with manual configuration. The other configurations, such as subnet stretching, LAN automation, and automated underlay, can be done with the help of Cisco DNA Center.

   Source: Adapted from community discussion — XalaGyan

   References

   • Cisco documentation

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9. Question 99 · 359 in bank

   

   Refer to the exhibit. A network engineer must design a multicast solution based on: * Many-to-many communications between the users and sources * Support of up to 50 multicast sources * Users that must register for steams Which multicast solution must the engineer select?

   • AAny Source Multicast
   • BBidirectional PIM
   • CSource-Specific Multicast
   • DMulticast VPN

   Show answer

   Answer: B

   Explanation

   I vote PIM-BIDIR PIM-BIDIR is specifically used for many-many and allows for easy scaling. The downside is since it doesn't use SPT and as such can be sub-optimal from a routing standpoint, but as you can see in the diagram that is not an issue here due to the lack of complexity.

   Source: Adapted from community discussion — jzzmth

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10. Question 100 · 359 in bank

    A customer plans to adopt distributed QoS in their enterprise WAN. The policy must allow for individual packet marking according to the type of treatment required and for forwarding based on hop-by-hop treatment locally defined on each device. Which technology must the customer select?

    • ACBWFQ
    • BLLQ
    • CDiffserv
    • DIntServ

    Show answer

    Answer: C

    References

    • cisco.com documentation

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300-420 practice, question 91. 359 questions available.