cisco 400-007 practice test

Cisco Certified Design Expert

Last exam update: Nov 28 ,2025
Page 1 out of 27. Viewing questions 1-15 out of 397

Question 1

Refer to the exhibit.

The enterprise customer wants to stream one-way video from their head office to eight branch
offices using multicast. Their current service provider provides a Layer3 VPN solution and manages
the CE routers, but they do not currently support multicast. Which solution quickly allows this
multicast traffic to go through while allowing for future scalability?

  • A. Enable a GRE tunnel between nodes CE1 and CE2
  • B. Enable a GRE tunnel between nodes C2 and C4
  • C. Enable a GRE tunnel between nodes C1 and C4
  • D. Implement hub and spoke MPLS VPN over DMVPN (also known as 2547o DMVPN) between CE1 and CE2
  • E. The service provider must provide a Draft Rosen solution to enable a GRE tunnel between nodes PE1 and PE2
Mark Question:
Answer:

B


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Question 2

An enterprise network has two core routers that connect to 200 distribution routers and uses full-
mesh IBGP peering between these routers as its routing method. The distribution routers are
experiencing high CPU utilization due to the BGP process. Which design solution is the most cost
effective?

  • A. Implement route reflectors on the two core routers
  • B. Increase the memory on the core routers
  • C. Implement e BGP between the core and distribution routers
  • D. Increase the memory on the distribution routers
  • E. Increase bandwidth between the core routers
Mark Question:
Answer:

A


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Question 3

You want to mitigate failures that are caused by STP loops that occur before UDLD detects the failure
or that are caused by a device that is no longer sending BPDUs. Which mechanism do you use along
with UDLD?

  • A. Root guard
  • B. BPDU guard
  • C. Loop guard
  • D. BPDU filtering
Mark Question:
Answer:

C


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Question 4

A multicast network is sing Bidirectional PIM. Which two combined actions achieve high availability
so that two RPs within the same network can act in a redundant manner? (Choose two)

  • A. Use two phantom RP addresses
  • B. Manipulate the administration distance of the unicast routes to the two RPs
  • C. Manipulate the multicast routing table by creating static mroutes to the two RPs
  • D. Advertise the two RP addresses in the routing protocol
  • E. Use anycast RP based on MSDP peering between the two RPs
  • F. Control routing to the two RPs through a longest match prefix
Mark Question:
Answer:

A, F


Explanation:
https://community.cisco.com/t5/networking-knowledge-base/rp-redundancy-with-pim-bidir-
phantom-rp/ta-p/3117191

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Question 5

Which purpose of a dynamically created tunnel interface on the design of IPv6 multicast services Is
true?

  • A. first-hop router registration to the RP
  • B. multicast client registration to the RP
  • C. multicast source registration to the RP
  • D. transport of all IPv6 multicast traffic
Mark Question:
Answer:

A


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Question 6

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. Santiago and Cape Town
  • C. Santiago and Mumbai
  • D. Cape Town and Mumbai
  • E. Cape Town and Beijing
  • F. Santiago and Beijing
Mark Question:
Answer:

D


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Question 7

How can EIGRP topologies be designed to converge as fast as possible in the event of a point-to-
point link failure?

  • A. Limit the query domain by use of distribute lists.
  • B. Build neighbor adjacencies in a triangulated fashion.
  • C. Build neighbor adjacencies in squared fashion.
  • D. Limit the query domain by use of summarization.
  • E. Limit the query domain by use of default routes.
Mark Question:
Answer:

D


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Question 8

Which effect of using ingress filtering to prevent spoofed addresses on a network design is true?

  • A. It reduces the effectiveness of DDoS attacks when associated with DSCP remarking to Scavenger.
  • B. It protects the network Infrastructure against spoofed DDoS attacks.
  • C. It Classifies bogon traffic and remarks it with DSCP bulk.
  • D. It filters RFC 1918 IP addresses.
Mark Question:
Answer:

B


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Question 9

Which relationship between IBGP and the underlying physical topology is true?

  • A. iBGP full mesh requirement does not dictate any specific network topology.
  • B. iBGP can worn only on a ring network topology with a link-state protocol like OSPF or IS-IS
  • C. iBGP full mesh requires an underlying fully meshed network topology.
  • D. iBGP does not work on a ring network topology even with an underlying IGP.
Mark Question:
Answer:

A


Explanation:
iBGP peers can be multiple hops away. not like eBGP that needs direct connection (or ebgp-multihop
defined). thus, only IP connectivity between two peers is required for an adjacency to form.

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Question 10

How many fully established neighbour relationships exist on an Ethernet with five routers running
OSPF as network type broadcast?

  • A. 5
  • B. 6
  • C. 7
  • D. 10
  • E. 20
Mark Question:
Answer:

C


Explanation:
Assuming routers R1-R5, R1 is elected DR, R2 BDR. Fully established neighborships only occur to DR
and BDR, all other neighbors are in 2Way DR other state. DR|BDRFull relationships:
R2-R1
R3-R1
R3-R2
R4-R1
R4-R2
R5-R1
R5-R2

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Question 11

Refer to the exhibit.

Traffic was equally balanced between Layer 3 links on core switches SW1 and SW2 before an
introduction of the new video server in the network. This video server uses multicast to send video
streams to hosts and now one of the links between core switches is over utilized Which design
solution solves this issue?

  • A. Add more links between core switches.
  • B. Aggregate links Layer 2 link aggregation.
  • C. Apply a more granular load- balancing method on SW1.
  • D. Apply a more granular load-balancing method on SW2.
  • E. Filter IGMP joins on an over -utilized link.
Mark Question:
Answer:

B


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Question 12

How must the queue sizes be designed to ensure that an application functions correctly?

  • A. Each individual device queuing delay in the chain must be less than or equal to the application required delay.
  • B. The queuing delay on every device in the chain must be exactly the same to the application required delay.
  • C. The default queue sizes are good for any deployment as it compensates the serialization delay.
  • D. The sum of the queuing delay of all devices plus serialization delay in the chain must be less than or equal to the application required delay.
Mark Question:
Answer:

D


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Question 13

Which two mechanisms avoid suboptimal routing in a network with dynamic mutual redistribution
between multiple OSPFv2 and EIGRP boundaries? (Choose two.)

  • A. AD manipulation
  • B. matching OSPF external routes
  • D. route tagging
  • E. route filtering
  • F. matching EIGRP process ID
Mark Question:
Answer:

DE


Explanation:
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8606-redist.html

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Question 14

Which Interconnectivity method offers the fastest convergence in the event of a unidirectional issue
between three Layer 3 switches connected together with routed links in the same rack in a data
center?

  • A. Copper Ethernet connectivity with BFD enabled
  • B. Copper Ethernet connectivity with UDLD enabled
  • C. Fiber Ethernet connectivity with BFD enabled
  • D. Fiber Ethernet connectivity with UDLD enabled
Mark Question:
Answer:

C


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Question 15

Which two actions ensure voice quality in a branch location with a low-speed, high-latency WAN
connection? (Choose two.)

  • A. Increase WAN bandwidth
  • B. Increase memory branch switch.
  • C. Fragment data packets.
  • D. Replace any electrical links with optical links
  • E. Prioritize voice packets
Mark Question:
Answer:

C, E


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