Cisco® 300-420 Exam Practice Questions (P. 1)
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Question #1
Which two BGP features will result in successful route exchanges between eBGP neighbors sharing the same AS number? (Choose two.)
- Aadvertise-best-external
- Bbestpath as-path ignore
- Cclient-to-client reflection
- Das-overrideMost Voted
- Eallow-as-inMost Voted
Correct Answer:
DE
DE

D) as-override and E) allow-as-in are indeed the correct choices here. Opting for as-override is crucial when you want eBGP routers with the same AS to treat paths as though they originate from a different AS, effectively allowing for the successful exchange of BGP routes. Similarly, allow-as-in is essential to relax the loop prevention rules that typically block routes containing the local AS in the AS_PATH. These functionalities enable effective routing information exchange in scenarios where multiple routers are configured with the same autonomous system number.
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Question #2
A customer with an IPv4 only network topology wants to enable IPv6 connectivity while preserving the IPv4 topology services. The customer plans to migrate IPv4 services to the IPv6 topology, then decommission the IPv4 topology. Which topology supports these requirements?
- Adual stackMost Voted
- B6VPE
- C6to4
- DNAT64
Correct Answer:
A
A

The dual stack model is the superior option for organizations planning a gradual transition from IPv4 to IPv6. This approach allows both protocols to operate concurrently without disrupting existing IPv4 services as they shift towards an IPv6 environment. Such a method supports the continuation and eventual decommissioning of IPv4 services, providing a smooth transition pathway as the organization evolves its network infrastructure to fully support IPv6.
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Question #3
DRAG DROP -
An engineer is designing an addressing plan for a small business using a single /24 network. Each department must have its own subnet. Drag and drop the subnets from the left onto the requirements of the department they fulfill on the right. Not all options are used.
Select and Place:

An engineer is designing an addressing plan for a small business using a single /24 network. Each department must have its own subnet. Drag and drop the subnets from the left onto the requirements of the department they fulfill on the right. Not all options are used.
Select and Place:

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Question #4
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?
- AMultihop
- BMultipath Load SharingMost Voted
- CNext-Hop Address Tracking
- DAS-Path Prepending
Correct Answer:
B
B

The correct feature for load balancing across multiple links in BGP configurations is Multipath Load Sharing. This feature supports both external BGP (eBGP) and internal BGP (iBGP), providing flexibility in how network traffic is distributed across multiple paths. It is particularly useful in scenarios like the one described, where a router has dual connections to the same ISP, maximizing the usage of available bandwidth and enhancing network resilience.
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Question #5
Company A recently acquired another company. Users of the newly acquired company must be able to access a server that exists on Company A's network, both companies use overlapping IP address ranges. Which action conserves IP address space and provides access to the server?
- AUse a single IP address to create overload NATMost Voted
- BUse a single IP address to create a static NAT entry
- CBuild one-to-one NAT translation for every user that needs access
- DRe-IP overlapping address space in the acquired company
Correct Answer:
A
A

The correct choice, 'Use a single IP address to create overload NAT' (Option A), effectively conserves IP address space while allowing multiple users from the new acquisition to access a server in Company A's network. Overload NAT, also known as PAT (Port Address Translation), maps multiple private IP addresses to a single public IP address using different ports. This method is resource-efficient and avoids the complexities and scalability issues associated with creating one-to-one static NAT configurations for each user (Option C) or re-IPing the entire network (Option D). This approach is particularly beneficial in scenarios with overlapping IP ranges, making it the optimal choice for conserving addresses while ensuring seamless access.
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Question #6
Which design consideration should be observed when EIGRP is configured on Data Center switches?
- APerform manual summarization on all Layer 3 interfaces to minimize the size of the routing table.Most Voted
- BPrevent unnecessary EIGRP neighborships from forming across switch virtual interfaces.
- CLower EIGRP hello and hold timers to their minimum settings to ensure rapid route reconvergence.
- DConfigure multiple EIGRP autonomous systems to segment Data Center services and applications.
Correct Answer:
A
A

When configuring EIGRP on Data Center switches, performing manual summarization on all Layer 3 interfaces is indeed a valid strategy to reduce the routing table size. This helps in efficiently managing routing updates and conserves resources in a dense data center environment. Although some user comments suggested that minimizing EIGRP neighborships on switch virtual interfaces (SVIs) could also be beneficial, focusing on summarization aligns well with the principles of scalable network design by simplifying the routing domain and enhancing overall network performance. This approach ensures a more streamlined handling of routes, crucial for maintaining optimal data center operations.
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Question #7
Which design consideration must be made when using IPv6 overlay tunnels?
- AOverlay tunnels that connect isolated IPv6 networks are considered a final IPv6 network architecture.
- BOverlay tunnels should only be considered as a transition technique toward a permanent solution.Most Voted
- COverlay tunnels should be configured only between border devices and require only the IPv6 protocol stack.
- DOverlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.
Correct Answer:
C
C

In the context of IPv6 overlay tunnels, it's essential to view them mainly as a transitional strategy, not a permanent solution. They are utilized to connect IPv6 islands during an interim period while moving towards a pervasive IPv6 environment that might also incorporate IPv4 support. Therefore, these tunnels facilitate in bridging gaps between different network protocols during migration phases.
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Question #8
When a network is designed using IS-IS, which two circuit types are supported? (Choose two.)
- Anonbroadcast multiaccess
- Bmultiaccess
- Cpoint-to-multipoint
- Dnonbroadcast
- Epoint-to-point
Correct Answer:
BE
BE

The choice of multiaccess and point-to-point circuit types for IS-IS is spot on! IS-IS indeed supports just these two types of network interfaces. The protocol distinguishes specifically between point-to-point connections, which involve direct links between two endpoints, and broadcast networks, which multiaccess falls under, permitting multiple devices to connect over a single network interface. Other types common in protocols like OSPF, such as nonbroadcast or point-to-multipoint, are not applicable for IS-IS, which keeps its network types streamlined to these two fundamental categories.
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Question #9
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?
- ALocal Preference
- BMED
- CWeight
- DAS Path
- ECommunity
Correct Answer:
C
C

Weight is indeed a Cisco proprietary BGP attribute that primarily influences outbound traffic flow by determining the preferred path from a router when multiple paths are available. It operates locally on the router, affecting only that specific device's route selection process and does not propagate through the network. This attribute effectively controls the exit traffic by selecting the most preferred path based on the highest weight value assigned.
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Question #10

Refer to the exhibit. EIGRP has been configured on all links. The spoke nodes have been configured as EIGRP stubs, and the WAN links to R3 have higher bandwidth and lower delay than the WAN links to R4. When a link failure occurs at the R1-R2 link, what happens to traffic on R1 that is destined for a subnet attached to R2?
- AR1 has no route to R2 and drops the trafficMost Voted
- BR1 load-balances across the paths through R3 and R4 to reach R2
- CR1 forwards the traffic to R3, but R3 drops the traffic
- DR1 forwards the traffic to R3 in order to reach R2
Correct Answer:
D
D
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