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Cisco 400-007 Exam Questions
Cisco Certified Design Expert CCDE v3.0 (Page 9 )

Updated On: 15-Feb-2026
Page 9 of 60
PDF with 397 Questions

A multicast network is using 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.)

  1. Advertise the two RP addresses in the routing protocol.
  2. Use two phantom RP addresses.
  3. Manipulate the multicast routing table by creating static mroutes to the two RPs.
  4. Control routing to the two RPs through a longest match prefix.
  5. Use Anycast RP based on MSDP peering between the two RPs.
  6. Manipulate the administrative distance of the unicast routes to the two RPs.

Answer(s): B,D


Reference:

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



Refer to the exhibit. Which impact of using three or more ABRs between the backbone area and area 1 is true?

  1. In a large-scale network, multiple ABRs can create microloops.
  2. Multiple ABRs reduce the CPU processing on each ABR due to splitting prefix advertisement between areas.
  3. Prefixes from the non-backbone area are advertised by one ABR to the backbone area.
  4. In a large-scale network, LSA replication, by all ABRs, can cause serious scalability issues.

Answer(s): D



Company XYZ runs OSPF in their network. A design engineer decides to implement hot-potato routing architecture. How can this implementation be achieved?

  1. Enable iBGP and apply prepend to ensure all prefixes will have the same length of the AS path attribute value.
  2. Redistribute the external prefixes onto OSPF and ensure that the total metric calculation includes external and internal values.
  3. Enable OSPF load-balancing over unequal cost path.
  4. Redistribute the external prefixes onto OSPF and ensure the total metric calculation includes only the external value and the value is the same in all ASBRs.

Answer(s): B


Reference:

https://www.packetmischief.ca/2017/02/28/five-functional-facts-about-ospf/#:~:text=OSPF%20allows%20traffic%20engineering%20using,carry%20a%20type%201%20metric.



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

  1. 5
  2. 6
  3. 7
  4. 10
  5. 20

Answer(s): 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



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

  1. Limit the query domain by use of summarization.
  2. Limit the query domain by use of default routes.
  3. Build neighbor adjacencies in a squared fashion.
  4. Limit the query domain by use of distribute lists.
  5. Build neighbor adjacencies in a triangulated fashion.

Answer(s): A

Explanation:

When a point-to-point link fails, EIGRP routers will send queries to their neighbors to find a new path to the destination network. The query domain is the set of routers that will receive these queries. By limiting the query domain, you can reduce the amount of time it takes for EIGRP to converge.

Summarization is a technique that can be used to limit the query domain. Summarization allows you to aggregate multiple routes into a single route. This reduces the number of routes that need to be advertised, which can help to speed up convergence.

The other options are not as effective for limiting the query domain. Option B, limiting the query domain by use of default routes, is not as effective because default routes can be used to reach a wide range of networks. Option C, building neighbor adjacencies in a squared fashion, does not affect the query domain. Option D, limiting the query domain by use of distribute lists, can be used to limit the query domain, but it is not as effective as summarization. Option E, building neighbor adjacencies in a triangulated fashion, does not affect the query domain.






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