BEST Verified Cisco 400-007 Exam Questions (2025)
The Best Practice Test Preparation for the 400-007 Certification Exam
Cisco 400-007 exam is a rigorous and challenging test that requires candidates to demonstrate their ability to design and implement complex network architectures. It is designed to ensure that only the most skilled and knowledgeable professionals are able to earn the prestigious CCDE certification.
NEW QUESTION # 209
If the desire is to connect virtual network functions together to accommodate different types of network service connectivity what must be deployed?
- A. bridging
- B. service chaining
- C. linking
- D. daisy chaining
- E. switching
Answer: B
Explanation:
Service chaining is the technique of connecting virtual network functions together to provide different types of network service connectivity. Service chaining uses software-defined networking (SDN) programmability to create a chain of connected network services, such as firewalls, load balancers, NAT, and intrusion protection. Service chaining can automate the provisioning of network applications that have different characteristics and requirements, such as security, latency, or quality of service (QoS). Service chaining can also optimize the use of network resources and improve application performance by using SDN analytics and performance tools to select the best available network paths and avoid network congestion. Service chaining is being used in many SDN and network functions virtualization (NFV) use cases and deployments, such as data centers, carrier networks, and virtual customer edge123. :
1: What is Network Service Chaining or Service Function Chaining - SDxCentral
2: On service chaining using Virtual Network Functions in Network-enabled Cloud systems | IEEE Conference Publication | IEEE Xplore
3: Service function chaining - Gini5
NEW QUESTION # 210
Refer to the table.
A customer investigates connectivity options for a DCI between two production data centers. The solution must provide dual 10G connections between locations with no single points of failure for Day 1 operations. It must also include an option to scale for up to 20 resilient connections in the second year to accommodate isolated SAN over IP and isolated, dedicated replication IP circuits. All connectivity methods are duplex 10 Gbps. Which transport technology costs the least over two years, in the scenario?
- A. Metro Ethernet
- B. MPLS
- C. DWDM
- D. CWDM
Answer: C
NEW QUESTION # 211
When a company network architect is working on a new network design, they are expected to ensure that business requirements and technical aspects are factored in, but often there are other factors that come into play as well. Which non-business constraint must also be considered throughout the design phase?
- A. Time
- B. Cost
- C. Location
- D. Compliance
Answer: D
Explanation:
In addition to business requirements, network architects must also account for non-business constraints such as legal, regulatory, and industry compliance. These may include standards like GDPR, HIPAA, PCI-DSS, or country-specific data sovereignty and retention laws.
Compliance is not typically driven by direct business value but by external mandates that influence how the network must be designed, implemented, and operated. Ignoring compliance requirements can result in significant legal or financial penalties and is therefore a core component of any responsible network design.
Other options such as:
* A. Location - may impact design (e.g., latency, availability), but it is often categorized as a technical or logistical consideration.
* B. Cost - is a business constraint.
* C. Time - is considered a project or delivery constraint, also typically business-driven.
NEW QUESTION # 212
Refer to the exhibit.
Your company designed a network to allow server VLANs to span all access switches in a data center In the design, Layer 3 VLAN interfaces and HSRP are configured on the aggregation switches Which two features improve STP stability within the network design? (Choose two.)
- A. BPDU guard on the aggregation switch downlinks toward access switches
- B. root guard on the aggregation switch downlinks toward access switches
- C. edge port on access ports
- D. BPDU guard on access ports
- E. access switch pairs explicitly determined to be root and backup root bridges
- F. root guard on access ports
Answer: C,D
NEW QUESTION # 213
Refer to the exhibit.
Refer to the exhibit A customer network design team is planning a migration from a legacy TDM-based L2VPN to an MPLS-based L3VPN Migration is planned in a phased approach:
* OSPF backbone Link between HUB A and HUB B sites to be migrated to eBGP
* Spoke A2 and Spoke B1 will be migrated to the L3VPN
Which solution design can be considered to avoid routing loops during backbone link migration?
- A. Enable route-filtering on OSPF backbone routers for spoke traffic
- B. Redistribute EIGRP 200 and 300 with low cost into BGP
- C. Advertise low AD value for transit traffic on hub sites.
- D. OSPF backbone area advertises summarized routes to hub.
Answer: D
NEW QUESTION # 214
Refer to the exhibit.
OSPF is running as the IGP to provide reachability to all AS100 networks R3 and R4 are the current ABRs at the boundary of OSPF Area0 and Areal Now BGP must be deployed within AS 100 because it will be receiving Internet routes from its eBGP peers (the service provider) connected to R1 and R2 What is an optimal solution for this deployment to configure BGP relationships and redistribute BGP learned routes into OSPF?
- A. R5 should be configured as a route reflector for R1, R2, R3 and R4. BGP routes must be redistributed at R1 and R2 into OSPF.
- B. Configuration should be set up with R1 and R2, and R3 in one sub AS, with and R4 in another, and redistribution at R1 and R2.
- C. A full mesh should be deployed between all the routers with mutual redistribution to take place at R1 and R2.
- D. R1, R2, R3 and R4 must be set up with a neighbor relationship with R5 only must not be a route reflector.
Answer: A
NEW QUESTION # 215
An organization is working on a design solution for a new Internet-based remote access virtual private network that has 1000 remote sites. A network administrator recommends GETVPN as the model What is a potential problem of using GETVPN in this situation?
- A. GETVPN key servers would be on public hacker-reachable space and need higher security
- B. GETVPN is not scalable to a large number of remote sites
- C. GETVPN and DMVPN do not interoperate
- D. GETVPN requires a high level of background traffic to maintain its IPsec SAs
Answer: A
NEW QUESTION # 216
What is a characteristic of a secure cloud architecture model?
- A. dedicated and restricted workstations
- B. software-defined network segmentation
- C. limited access to job function
- D. multi-factor authentication
Answer: D
NEW QUESTION # 217
Which two design options are available to dynamically discover the RP in an IPv6 multicast network?
(Choose two)
- A. MLD
- B. Auto-RP
- C. Embedded RP
- D. MSDP
- E. BSR
Answer: C,E
Explanation:
IPv6 multicast supports two key mechanisms for Rendezvous Point (RP) discovery:
* A. Embedded RP: The RP address is embedded within the multicast group address (ff70::/12). This allows automatic RP discovery by routers and eliminates the need for signaling protocols.
* C. BSR (Bootstrap Router): Used in IPv6 as a replacement for Auto-RP (which is IPv4-specific), BSR dynamically announces the RP to multicast routers in the domain.
Other options:
* B. MSDP: Not supported in IPv6 multicast since source registration and discovery are handled differently.
* D. Auto-RP: IPv4-specific and not supported in IPv6.
* E. MLD: Manages listener (receiver) membership, not RP discovery.
NEW QUESTION # 218
Refer to the exhibit.
Refer to the exhibit. A new high availability DB server cluster is installed in the network. These two servers require high bandwidth and low latency Layer 2 connectivity for database replication.
Which solution supports these requirements?
- A. Add secondary links to REP segments 1 and 2
- B. Add two new links between SW1 and SW2 configured as LACP trunk with STP
- C. Add two new links between SW1 and SW2 configured as REP segments 1 and 2 respectively
- D. Add two new links between SW1 and SW2 configured as REP segment 3
Answer: D
Explanation:
To support high-bandwidth, low-latency Layer 2 communication between DB Server 1 and DB Server 2, you must create a direct Layer 2 path between SW1 and SW2. Using REP (Resilient Ethernet Protocol) segments ensures loop-free Layer 2 operation without the drawbacks of STP convergence delays.
* Option C is correct: Adding a third REP segment (Segment 3) directly between SW1 and SW2 isolates the traffic between the two DB servers and ensures deterministic behavior with fast convergence.
* Option A (LACP with STP) introduces STP blocking and doesn't align well with REP's control plane.
* Option B and D: Overloading existing segments or splitting new links into existing REP segments does not offer the same direct path, bandwidth, or deterministic behavior.
NEW QUESTION # 219
A network attacker exploits application flaws to compromise critical systems in the organization with these objectives:
* Obtain sensitive data and export the data out of the network.
* Compromise developer and administrator credentials to potentially
What is the next step after application discovery is completed in Zero Trust networkings
- A. Assess real-time security health.
- B. Ensure trustworthiness of systems.
- C. Establish visibility and behavior modeling
- D. Enforce policies and microsegmentation.
Answer: D
Explanation:
https://www.cisco.com/c/en/us/solutions/collateral/enterprise/design-zone-security/zt-arch-guide.html
NEW QUESTION # 220
A company created an IPv6 adoption plan for its campus network that requires dual-stack connectivity on the network Campus users must have IPv6 connectivity to an HR management application which is the first IPv6-only application hosted in the company s data center. Which two security mechanisms can be used to prevent a malicious user from masquerading as the IPv6 gateway? (Choose two)
- A. IPv6 address glean
- B. IPv6 RA guard
- C. IPv6 snooping
- D. port ACLs
- E. IPv6 device tracking
Answer: A,B
NEW QUESTION # 221
Company XYZ plans to run OSPF on a DMVPN network. They want to use spoke-to-spoke tunnels in the design. What is a drawback or concern in this type of design?
- A. Manual configuration of the spokes with the appropriate priority will be needed
- B. Additional host routes will be inserted into the routing tables
- C. There will be split-horizon issue at the hub
- D. Manual configuration of the spoke IP address on the hub will be needed
Answer: B
Explanation:
* A (Additional host routes):Spoke-to-spoke dynamic tunnels in DMVPN phase 3 result in OSPF populating routing tables with multiple /32 host routes for each spoke-to-spoke tunnel, which can impact scalability and routing table size.
Other options explained:
* B: Priority changes not typically required.
* C: Split-horizon issue is solved in DMVPN phase 3.
* D: Spokes dynamically register with the hub; no manual spoke IP configuration needed.
NEW QUESTION # 222
A software-defined network exposes an API to the RIB and forwarding engine, allowing off-box control of routing-what SDN model is used?
- A. Replace
- B. Distributed
- C. Hybrid
- D. Augmented
Answer: D
Explanation:
Comprehensive and Detailed Explanation:
* B: Augmented SDN allows external applications or controllers to interact with the traditional control plane (e.g., RIB or FIB) via APIs, without fully replacing it.
* A (replace) removes traditional control protocols entirely.
* C (hybrid) uses both SDN and legacy control planes, but without deep integration.
* D (distributed) refers to traditional decentralized control planes.
Augmented SDN enhances traditional routing with programmable control, offering near real-time visibility and dynamic response without disrupting the existing control architecture.
NEW QUESTION # 223
Various teams in different organizations within an enterprise are preparing low-level design documents using a Waterfall project model. Input from relevant stakeholders was captured at the start of the project, and the scope has been defined. What impact will it have if stakeholders ask for changes before documentation is complete?
- A. This provides more opportunity to think outside the box.
- B. Rework is expected before the delivery.
- C. Significant effort and time are required.
- D. This provides a flexible approach to incorporate changes.
Answer: C
Explanation:
* C (Significant effort and time): In a Waterfall model, changes introduced after the design phase require rework of multiple design documents, validations, and downstream impacts on implementation and testing. This leads to significant delays and resource consumption compared to more flexible models like Agile.
Other options explained:
* A: Creativity is not the primary impact.
* B: Rework is true but doesn't fully capture the scope of additional effort.
* D: Waterfall does not provide inherent flexibility to absorb late changes.
-
NEW QUESTION # 224
Drag and drop the FCAPS network management reference models from the left onto the correct definitions on the right.
Answer:
Explanation:
NEW QUESTION # 225
Refer to the exhibit.
ACME Mining has four data centers in Santiago. Cape Town. Mumbai, and Beijing, full-mesh connected via a
400 Mb/s EVP-LAN They want to deploy a new mission-critical application with these requirements:
* cluster heartbeat 2 Mb/s continuous (250 KB/s)
* cluster heartbeat one-way maximum latency 100 ms
These are the current ping tests results between the four data centers:
Which hosting data center pair can host the new application?
- A. Mumbai and Beijing
- B. Cape Town and Beijing
- C. Santiago and Cape Town
- D. Cape Town and Mumbai
- E. Santiago and Mumbai
- F. Santiago and Beijing
Answer: D
NEW QUESTION # 226
A network architect in an enterprise is designing a network policy for certain database applications. The goal of the policy is to allow these applications to access the internet directly, whereas other user and network applications that communicate with systems or users outside their own network must be routed through the data center. The focus is on achieving higher availability and a better user experience for the database applications, but switching between different network paths based on performance characteristics must be supported.
Which solution meets these requirements?
- A. MPLS L3VPN with QoS
- B. MPLS direct connect
- C. Cloud onRamp for laaS
- D. Cloud onRamp for SaaS
Answer: D
Explanation:
https://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/sd-wan/nb-06-cloud-onramp-saas-faq-cte-en.html
NEW QUESTION # 227
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