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
An engineer is designing a campus network with Cisco Catalyst 95CO switches in the aggression layer. The design requires running nonblocking Layer 2 MEC from the aggregation layer to the access layer. The Catalyst switches are located on different campus floors for availability reasons, and each access switch veil contam a single VLAN.
Which technology must the engineer choose for the aggregation switches in the design?
- A . VPC
- B . VSS
- C . StackWise Virtual
- D . StackWise-180
Which design consideration must be made when dual WAN Edge routers are deployed at a branch site?
- A . Use BGP AS-path prepending to influence egress traffic and use MED to influence ingress traffic from the branch.
- B . HSRP priorities must match the OMP routing policy to prefer one WAN Edge over the other.
- C . Traffic must be symmetrical as it egresses the WAN Edges and returns from remote sites for DPI to function properly.
- D . Configure BFD between WAN Edge routers to detect sub-second link failures.
An engineer must connect a new remote site to an existing OSPF network. The new site consists of two low-end routers, one for WAN, and one for LAN. There is no demand for traffic to pass through this area.
Which area type does the engineer choose to provide minimal router resources utilization, while still allowing for full connectivity to the rest of the network?
- A . not so stubby
- B . totally not so stubby
- C . totally stubby area
- D . stubby area
Which WAN connectivity technology is optimal for edge computing compared to others and why?
- A . Due to low latency, high bandwidth, and closest proximity to the user. 4G/5G connectivity is the optimal WAN technology for edge computing compared to L3 VPN MPLS connectivity, which offers native separation and security with close proximity to the data center.
- B . Due to high bandwidth, separation and security, and proximity to the data center network. DWDM Is the optimal WAN technology lor edge computing compared to 4G/5G connectivity, which offers native separation and security with close proximity to the data center.
- C . Due to low latency, high bandwidth, and closest proximity to the user, L3 VPN MPLS connectivity is the optimal WAN technology for edge computing compared to 4G/5G connectivity, which offers native separation and security with close proximity to the data center.
- D . Due to low cost, high bandwidth, low latency, and closest proximity to the edge of the network, Mero Ethernet is the optimal WAN technology for edge computing compared to MPLS, which offers native separation and security with close proximity to the data center.
An architect must create a QoS solution for a customer to ensure that a 40 Mbps Internet connection is shared between four subnets based on these requirements:
* Each subnet must receive no less than 10 Mbps of download bandwidth during peak traffic times.
* A subnet can use up to 40 Mbps during nonpeak traffic times if the other subnets are idle.
* Download traffic must never experience a delay.
Which solution must the architect choose?
- A . rate-limiting and shaping
- B . bandwidth percentage and policing
- C . shaping and policing
- D . bandwidth percentage and rate-limiting
DRAG DROP
Drag and drop the characteristics from the left onto the telemetry mode they apply to on the right.
When a first hop redundancy solution is designed, which protocol ensures that load balancing occurs over multiple routers using a single virtual IP address and multiple virtual MAC addresses?
- A . GLBP
- B . IRDP
- C . VRRP
- D . HSRP
What is the purpose of a control plane node in a Cisco SD-Access network fabric?
- A . to maintain the endpoint database and mapping between endpoints and edge nodes
- B . to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings
- C . to identify and authenticate endpoints within the network fabric
- D . to act as the network gateway between the network fabric and outside networks
Refer to the exhibit.
The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails.
Which solution minimizes the downtime to the sub-second?
- A . Aggressive timers
- B . Next-hop address tracking
- C . Graceful-restart
- D . BFD
Refer to the exhibit.
The distribution switches serve as the layer 3 boundary. HSRP preemption is enabled. When the primary switch comes back after a failure, traffic is initially dropped.
Which solution must be implemented to improve the design?
- A . Increase the hello timers on both HSRP devices
- B . Use the preempt delay feature on the primary HSRP device.
- C . Use the preempt delay feature on the backup HSRP device
- D . Configure a higher mac-refresh interval on both HSRP devices
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