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Cisco Designing Cisco Enterprise Networks Sample Questions (Q60-Q65):

NEW QUESTION # 60
An engineer is designing a network for a customer running a wireless network with a common VLAN for all APs. The customer is experiencing unicast flooding in the Layer 2 network between the aggregation and access layers. The customer wants to reduce the flooding and improve convergence time. Which solution meets these requirements?

A. Migrate to a Layer 3 access campus design if the APs can run on separate VLANs.
B. Align HSRP primary and STP root bridges if the APs cannot run on separate VLANs.
C. Migrate all APs to a common Layer 2 access layer switch and run Layer 3 from the aggregation layer to all remaining access layer switches.
D. Align HSRP primary and STP root bridges and reduce ARP timers to match CAM timers on the aggregation layer switches.

Answer: D

Explanation:
The default ARP table aging time is 4 hours while the CAM holds the entries for only 5 minutes.
The switch sends out a frame to all forwarding ports within the respective VLAN when the destination MAC address is aged out from the CAM table. You need a CAM aging timer greater or equal to the ARP timeout in order to prevent unicast flooding.
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/71079-arp- cam- tableissues.html#:~:text=The%20default%20ARP%20table%20aging%20time%20is%204,ARP%
20timeout%20in%20order%20to%20prevent%20unicast%20flooding.

NEW QUESTION # 61
Refer to the exhibit.

An architect must design an IGP solution for an enterprise customer. The design must support:
Physical link flaps should have minimal impact.
Access routers should converge quickly after a link failure.
Which two ISIS solutions should the architect include in the design? (Choose two.)

A. Use BGP to IS-IS redistribution to advertise all Internet routes in the Level 1 area.
B. Reduce SPF and PRC intervals to improve convergence time.
C. Configure access routers to establish a Level 1 adjacency and aggregate routers to establish a Level 1 / Level 2 adjacency.
D. Configure all access and aggregate routers to establish Level 1 / Level 2 adjacencies across the network.
E. Advertise the IS-IS interface and loopback IP address toward the Internet and data center.

Answer: B,D

NEW QUESTION # 62
Refer to the exhibit. An architect must design a resilient gateway solution based on these requirements:
- VLAN 10 and VLAN 11 support voice and video applications.
- Link and node failures must have minimal impact on traffic.
- Provide protection against false hello packets.
- Support IPv6.
Which solution must the architect choose?

A. GLBP with IP SLA tracking
B. VRRP version 2 with authentication
C. HSRP version 2 with MD5 authentication
D. VRRP version 2 with object tracking

Answer: C

NEW QUESTION # 63

Refer to the exhibit An engineer is designing a hierarchical ISIS solution for an enterprise customer with these requirements
* Users in areas 25 and 55 send and receive traffic from both backbone areas
* Link flaps in areas 35 and 45 must not impact other areas
* Routers will double within the next 12 months in areas 35 and 45
Which design must the engineer select?

A. A series routers Level 1/2 B series routers Level 2 and C series routers Level 2
B. A series routers Level 1. B series routers Level 1/2. and C series routers Level 2
C. A series routers Level 2, B series routers Level 2, and C series routers Level 1
D. A series routers Level 1.2 B series routers Level 1/2 and C series routers Level 1/2

Answer: B

NEW QUESTION # 64
Refer to the exhibit. An architect must design an IGP solution for an enterprise customer. The design must support:
- Physical link flaps should have minimal impact.
- Access routers should converge quickly after a link failure.
Which two ISIS solutions should the architect include in the design? (Choose two.)

A. Configure access routers to establish a Level 1 adjacency and aggregate routers to establish a Level 1 / Level 2 adjacency.
B. Use BGP to IS-IS redistribution to advertise all Internet routes in the Level 1 area.
C. Reduce SPF and PRC intervals to improve convergence time.
D. Configure all access and aggregate routers to establish Level 1 / Level 2 adjacencies across the network.
E. Advertise the IS-IS interface and loopback IP address toward the Internet and data center.

Answer: A,C

Explanation:
Answer C should be responsible for timer optimization.
Answer E should be the proper design in an "IS-IS Hybrid topology design".
(L1/L2 routers maintain a separate lin-state database for L1 routes and L2 routes > This increases their CPU > So Access routes should never be both L1/L2 devices, only pure L1 devices)

NEW QUESTION # 65
......

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100% Pass Quiz Trustable Cisco - 300-420 - Certified Designing Cisco Enterprise Networks Questions

Latest 300-420 Dumps Sheet & 300-420 Exam Sims

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q60-Q65):

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