300-420Updated 8d ago · Aug 28, 2026

300-420 ENSLD: Designing Cisco Enterprise Networks

Name: 300-420 ENSLD: Designing Cisco Enterprise Networks
Brand: Cisco
Price: 29.00 USD
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417 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 41 questions are free to preview.

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#	Topic	Questions	Free
1	Network Services	417	41

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Question 1 · Network Services Open

Refer to the exhibit. ISP_C is providing IPTV services to ISP_A and ISP_B. The IPTV services use the GLOP IP address range **233.3.1.0/24**. PIM-SM has already been enabled globally in each ISP network, and RP functions have been configured on edge routers in every autonomous system. ISP_C must implement a connection based on RFC 3618. Which solution meets this requirement?

Answer: C RFC 3618 specifies the Multicast Source Discovery Protocol (MSDP). MSDP allows RPs in different autonomous systems to exchange information about active multicast sources, enabling receivers in ISP_A and ISP_B to join IPTV groups sourced in ISP_C while each AS retains its own RP-based PIM-SM domain. **Learn more:** [RFC 3618: Multicast Source Discovery Protocol (MSDP)](https://www.rfc-editor.org/rfc/rfc3618.html)

Question 2 · Advanced Addressing and Routing Solutions Open

An engineer must establish BGP peering with an ISP for internet connectivity. Initially, the engineer wants to receive only particular prefixes from the ISP, along with a default route. However, the solution must retain the flexibility to add prefixes quickly in the future. The ISP has a two-week change process. Which route-filtering solution must the engineer use?

Answer: C A full Internet routing table combined with an inbound prefix list lets the enterprise locally permit the default route and only the required prefixes, while implicitly denying all other received routes. The prefix list can be updated by the enterprise without waiting for the ISP’s change process. Cisco documents that prefix lists can be applied to inbound BGP updates and that unmatched prefixes are implicitly denied. **Learn more:** [Cisco IOS BGP Command Reference — IP Prefix Lists](https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/command/irg-cr-book/bgp-c1.html) · [Cisco BGP Configuration Guide — Prefix Lists for BGP Filtering](https://www.cisco.com/c/en/us/td/docs/IIOT/switches/ie3x00/config/ip-routing/ip-routing/g_configuring-bgp/information_about_bgp.html)

Question 3 · Advanced Addressing and Routing Solutions Open

Refer to the exhibit. During a redistribution design review, a client requests that R2 be preferred over R3 for traffic traveling toward the EIGRP domain. Which method satisfies this design requirement?

Answer: C To make OSPF routers prefer R2 when reaching EIGRP destinations, redistribute EIGRP routes into OSPF as Type 1 external routes at R2 and as Type 2 external routes at R3. OSPF gives Type 1 external paths preference over Type 2 external paths; E1 also accounts for the internal OSPF cost to the advertising ASBR. **Learn more:** [OSPF Type-5 Route Calculation Configuration Example](https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/118799-configure-ospf-00.html)