Cisco 300-420 Designing Cisco Enterprise Networks (ENSLD) Online Training
Cisco 300-420 Online Training
The questions for 300-420 were last updated at Oct 23,2025.
- Exam Code: 300-420
- Exam Name: Designing Cisco Enterprise Networks (ENSLD)
- Certification Provider: Cisco
- Latest update: Oct 23,2025
A network solution is being designed for a company that connects to multiple Internet service providers.
Which Cisco proprietary BGP path attribute will influence outbound traffic flow?
- A . Local Preference
- B . MED
- C . Weight
- D . AS Path
- E . Community
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.
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.
Which control-plane technology allows the same subnet to exist across multiple network locations?
- A . LISP
- B . VXLAN
- C . FabricPath
- D . ISE mobility services
A customer’s current Layer 2 infrastructure is running Spanning Tree 802.1d, and all configuration changes are manually implemented on each switch.
An architect must redesign the Layer 2 domain to achieve these goals:
✑ reduce the impact of topology changes
✑ reduce the time spent on network administration
✑ reduce manual configuration errors
Which two solutions should the architect include in the new design? (Choose two.)
- A . Implement Rapid PVST+ instead of STP.
- B . Implement MST instead of STP.
- C . Use VTP to propagate VLAN information and to prune unused VLANs.
- D . Configure broadcast and multicast storm control on all switches.
- E . Configure dynamic trunking protocol to propagate VLAN information.
Refer to the exhibit.
A customer needs to apply QoS to the network management traffic passing through the GigabitEthernet0/2 interface. All eight queuing classes are in use, so the new requirement must be integrated into the existing policy.
Which solution must the customer choose?
- A . Mark traffic to DSCP CS5 and assign it to the SIGNALLING class. Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the SIGNALLING class.
- B . Mark the traffic to DSCP CS4 and assign it to the SIGNALLING class. Then, prioritize traffic within the class.
- C . Mark the traffic to DSCP CS6 and assign it to the ROUTING class Then, prioritize traffic within the class.
- D . Mark the traffic to DSCP CS2 and assign it to the ROUTING class Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the ROUTING class
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
An enterprise customer has these requirements:
✑ end-to-end QoS for the business-critical applications and VoIP services based on CoS marking.
✑ flexibility to offer services such as IPv6 and multicast without any reliance on the service provider.
✑ support for full-mesh connectivity at Layer 2.
Which WAN connectivity option meets these requirements?
- A . VPWS
- B . MPLS VPN
- C . DMVPN
- D . VPLS
Refer to the exhibit.
AS65533 and AS65530 are announcing a partial Internet routing table as well as their IP subnets. An architect must create a design that ensures AS64512 become a transit AS.
Which filtering solution must the architect choose?
- A . Maximum-prefix
- B . No-advertise
- C . Next-hop
- D . No Export
A network engineer must optimize a campus OSPF deployment Currently each time a type 1 or type 2 LSA is generated within an area, the OSPF process must recompute the entire SPT.
Which solution improves the recomputation process?
- A . iSPF
- B . BFD
- C . SPF
- D . PRC
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