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Question 1

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When designing OSPF for an enterprise with 60 remote sites, why is a single-area design (area 0) generally avoided?

OSPF cannot run with more than 50 routers in any area

LSDB size, SPF cost, and flooding scope all grow with area size, hurting convergence and stability

Single-area OSPF cannot perform ECMP load sharing

Single-area OSPF requires manual neighbor statements at each site

to track

2026 Statistics

Key Facts: ENSLD 300-420 Exam

~60

Exam Questions

Cisco ENSLD v1.1

90 min

Exam Duration

Cisco

~825/1000

Passing Score (typical)

Cisco does not publish exact cut

$300

Exam Fee (USD)

Pearson VUE

25%

Routing + Campus weight (each)

ENSLD v1.1 blueprint

3 years

Certification Validity

Cisco recertification policy

Cisco 300-420 ENSLD v1.1 is a 90-minute CCNP Enterprise concentration exam with about 60 questions (multiple choice, drag-and-drop, scenario-based). The exam fee is $300 USD at Pearson VUE, with a scaled passing score near 825/1000. Topic weightings are 25% Routing, 25% Campus/SD-Access, 20% WAN/SD-WAN, 20% Network Services (QoS/multicast), and 10% Automation. Passing earns the Cisco Certified Specialist - Enterprise Design badge and, with 350-401 ENCOR, the CCNP Enterprise certification (valid 3 years).

Sample ENSLD 300-420 Practice Questions

Try these sample questions to test your ENSLD 300-420 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1When designing OSPF for an enterprise with 60 remote sites, why is a single-area design (area 0) generally avoided?

A.OSPF cannot run with more than 50 routers in any area

B.LSDB size, SPF cost, and flooding scope all grow with area size, hurting convergence and stability

C.Single-area OSPF cannot perform ECMP load sharing

D.Single-area OSPF requires manual neighbor statements at each site

Explanation: OSPF design guides recommend multi-area to limit LSDB size, contain SPF recalculation, and bound LSA flooding within an area. Hierarchy via ABRs scales the design and isolates instability so a flap at one site does not trigger SPF on every router.

2Which OSPF area type blocks Type 5 external LSAs but still allows Type 7 LSAs to be redistributed and translated at the ABR?

A.Stub area

B.Totally stubby area

C.Not-so-stubby area (NSSA)

D.Backbone area

Explanation: An NSSA blocks Type 5 (external) LSAs from entering the area but permits external prefixes via Type 7 LSAs originated by an ASBR inside the NSSA. The ABR then translates Type 7 into Type 5 when injecting them into other areas.

3On which OSPF routers should you summarize inter-area prefixes using the area range command?

A.On every internal router in the area

B.On the ABRs that connect the area to the backbone

C.On the ASBR redistributing external routes

D.On the DR/BDR of the area

Explanation: OSPF inter-area summarization is performed on ABRs using area <id> range, which collapses Type 3 LSAs sent from that area into a single summary LSA. ASBRs summarize external (Type 5) routes via summary-address.

4An OSPF design includes a non-backbone area that has lost its physical connection to area 0. Which mechanism is the recommended last-resort fix in design guides?

A.Configure a virtual link across an intermediate area

B.Convert the orphan area to a stub area

C.Re-deploy the area as an NSSA with default-information originate

D.Use a GRE tunnel between two random routers in the area

Explanation: When an area is disconnected from area 0, OSPF allows a virtual link through a non-stub transit area to logically extend the backbone. Cisco design guides explicitly call this a temporary or last-resort fix because it complicates troubleshooting and adds dependency on the transit area.

5Which EIGRP design technique most directly limits the scope of EIGRP queries during a topology change?

A.Increasing hello and hold timers

B.Configuring EIGRP stub routers and route summarization at hierarchical boundaries

C.Enabling EIGRP authentication

D.Switching from EIGRP classic mode to named mode

Explanation: EIGRP queries are bounded by stub routers (which do not propagate queries) and by summarization, because a router that has only a summary route returns a successor immediately rather than flooding queries deeper. Both are core EIGRP design recommendations.

6Which BGP scaling technique replaces an iBGP full mesh by allowing a route reflector to re-advertise iBGP-learned prefixes to its clients?

A.BGP confederations

B.Route reflectors

C.Peer groups

D.Soft reconfiguration

Explanation: Route reflectors break the iBGP full-mesh requirement by reflecting iBGP-learned routes from a non-client to clients (and from clients to non-clients and other clients). This is the most common scaling technique inside a single autonomous system.

7An enterprise wants to influence inbound traffic from one specific upstream provider toward two of its prefixes. Which BGP attribute should it ask the provider to honor through a community-based policy?

A.Local Preference

B.MED (Multi-Exit Discriminator)

C.AS-path prepending only

D.Origin code

Explanation: MED is advertised to a neighboring AS to influence how that neighbor selects entry points back into our AS. Many providers expose communities that map to MED or local-pref tweaks inside their network, allowing the customer to steer inbound traffic for specific prefixes.

8When designing redistribution between OSPF and EIGRP at two boundary routers, what is the primary design risk?

A.Increased SPF runtime in OSPF

B.Routing loops and suboptimal paths from mutual redistribution

C.Incompatibility between OSPF MD5 and EIGRP MD5 keys

D.Inability to advertise IPv6 prefixes

Explanation: Mutual redistribution at two or more boundaries can re-inject routes back into the originating protocol, creating loops or causing routes to take suboptimal paths. Cisco's design guidance is to use route tags, distribute lists, or admin distance changes to filter these returning prefixes.

9Which IPv6 transition mechanism lets dual-stack hosts behind an IPv6-only network reach IPv4-only servers without per-host configuration?

A.6to4 tunneling

B.ISATAP

C.NAT64 with DNS64

D.6PE

Explanation: NAT64 with DNS64 lets IPv6-only clients reach IPv4-only servers: DNS64 synthesizes AAAA records from A records, and NAT64 translates IPv6 packets to IPv4 at the boundary. It is the standard design for retiring IPv4 on the access network while preserving IPv4 server reachability.

10A campus uses OSPFv3 for IPv6. Which statement about OSPFv3 is correct?

A.OSPFv3 packets are sourced from a global IPv6 address

B.OSPFv3 peers are identified by their IPv4 router-id

C.OSPFv3 cannot run on links that also carry OSPFv2 (IPv4)

D.OSPFv3 uses TCP for reliable transport

Explanation: OSPFv3 still uses a 32-bit Router ID, typically expressed in dotted-decimal notation borrowed from an IPv4 address. Packets are exchanged over link-local IPv6 addresses, and OSPFv3 can run alongside OSPFv2 on the same link (separate processes/instances).

About the ENSLD 300-420 Exam

The Cisco 300-420 ENSLD (Designing Cisco Enterprise Networks) v1.1 is a 90-minute, ~60-question CCNP Enterprise concentration exam covering enterprise design across five domains: advanced addressing and routing (IS-IS, EIGRP, OSPF, BGP, IPv6 migration), advanced campus networks (FHRP, BFD, STP scalability, multicampus L3, SD-Access fabric), WAN (MPLS L3VPN, DMVPN, IPsec, Cisco SD-WAN), network services (QoS, multicast, network management), and automation (YANG, NETCONF/RESTCONF, model-driven telemetry, gRPC/gNMI, cloud connectivity).

Questions

60 scored questions

Time Limit

90 minutes

Passing Score

~825/1000 (Cisco does not publish exact cut score)

Exam Fee

$300 (Cisco / Pearson VUE)

ENSLD 300-420 Exam Content Outline

25%

Advanced Addressing and Routing Solutions

Structured IPv4/IPv6 addressing plans, scalable IS-IS/EIGRP/OSPF/BGP designs, BGP attributes (LP, MED, AS-path, communities), route reflectors, basic route filtering, load sharing, and IPv6 migration (dual-stack, tunneling, IPv4/IPv6 translation boundaries)

25%

Advanced Enterprise Campus Networks

Campus high availability with FHRP (HSRP/VRRP/GLBP), platform abstraction, graceful restart, BFD; STP scalability, fast convergence, loop-free L2 (Root/BPDU/Loop guard), PoE/WoL, L2 security (port security/VACL); multicampus L3 (convergence, summarization, filtering, VRFs, redistribution); SD-Access architecture and fabric design

20%

WAN for Enterprise Networks

WAN options (MPLS L3/L2 VPN, Metro Ethernet, DWDM, 4G/5G, SD-WAN customer edge); site-to-site VPNs (DMVPN, IPsec, GRE, GET VPN, MPLS L3 VPN); HA designs (single/multi-homed, backup, failover); Cisco SD-WAN architecture (vManage/vSmart/vBond/WAN Edge) and design

20%

Network Services

QoS strategies (DiffServ vs IntServ); end-to-end QoS (classification, marking, shaping, policing, queuing); network management (in-band vs out-of-band, segmented mgmt, prioritizing mgmt traffic); multicast (source/shared trees, RPF, RPs, SSM, PIM Bidir, MSDP)

10%

Automation

IETF vs OpenConfig vs Cisco YANG models; NETCONF vs RESTCONF; model-driven telemetry (periodic and on-change); gRPC and gNMI; cloud connectivity (Direct Connect, Cloud OnRamp, MPLS direct connect); cloud service models (SaaS/PaaS/IaaS)

How to Pass the ENSLD 300-420 Exam

What You Need to Know

Passing score: ~825/1000 (Cisco does not publish exact cut score)
Exam length: 60 questions
Time limit: 90 minutes
Exam fee: $300

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ENSLD 300-420 Study Tips from Top Performers

1Memorize the v1.1 domain weightings: 25% Routing, 25% Campus/SD-Access, 20% WAN/SD-WAN, 20% Services (QoS+multicast), 10% Automation

2Master OSPF area design: ABR/ASBR placement, summary at ABRs (area range) and ASBRs (summary-address), stub/totally-stubby/NSSA, virtual link as a last resort

3Know BGP design knobs: LP > AS-path > MED, communities for traffic engineering, route reflector clusters to avoid full mesh, peer groups for scaling

4SD-Access: LISP control plane, VXLAN data plane, TrustSec SGTs for policy, Catalyst Center as automation; understand fabric site/zone and fabric-enabled wireless

5SD-WAN four planes: orchestration (vBond), management (vManage), control (vSmart with OMP), data (WAN Edge); know AAR, ZTP, and SIG/SSE integration

6QoS: 8-class model (VoIP EF/CS5, signaling CS3, network control CS6, broadcast CS4, multimedia conferencing AF4x, multimedia streaming AF3x, transactional AF2x, scavenger CS1, best effort)

7Multicast: PIM-SM with RP, Anycast RP via MSDP for redundancy, SSM for one-to-many (no RP), PIM Bidir for many-to-many

8Automation contrasts: NETCONF (XML over SSH, datastores) vs RESTCONF (JSON/XML over HTTPS); IETF vs OpenConfig vs Cisco-native YANG; gNMI streams telemetry

Frequently Asked Questions

What is the Cisco 300-420 ENSLD exam?

Cisco 300-420 ENSLD (Designing Cisco Enterprise Networks) v1.1 is a 90-minute CCNP Enterprise concentration exam with approximately 60 questions. It validates enterprise design skills across routing, campus, WAN, SD-Access, SD-WAN, QoS, multicast, and automation. Passing it earns the Cisco Certified Specialist - Enterprise Design badge.

How many questions are on the 300-420 ENSLD exam and how long is it?

The 300-420 ENSLD exam has approximately 60 questions and a 90-minute time limit. Question formats include multiple choice (single and multiple answer), drag and drop, and scenario-based design questions. There are no scheduled breaks within the 90-minute window.

What is the passing score for Cisco 300-420?

Cisco does not publish exact passing scores for 300-420. Scaled scores are reported on a 300-1000 range, and community guidance places the cut around 825/1000. Cisco may change the cut score without notice, so treat 825 as a target rather than a guarantee.

How much does the 300-420 ENSLD exam cost?

The 300-420 ENSLD exam fee is $300 USD, paid to Pearson VUE at registration. The fee is the same whether you take the exam at a Pearson VUE test center or via OnVUE online proctored delivery. Local taxes may apply outside the United States.

How should I prepare for the Cisco 300-420 ENSLD exam?

Plan for 80-150 hours over 2-4 months. Core resources: the official ENSLD v1.1 exam topics PDF, the Cisco Press CCNP Enterprise Design ENSLD 300-420 Official Cert Guide, Cisco Design Zone CVDs (SD-Access, SD-WAN, campus), and timed practice exams. Aim for 85%+ on practice scoring before scheduling.

Does Cisco 300-420 certification expire?

The Cisco Certified Specialist - Enterprise Design status earned by passing 300-420 is valid for 3 years. Recertify by passing another professional or expert exam, or by earning Continuing Education credits via the Cisco CE program, before the 3-year window closes.