Cisco Certified Design Expert v3.0 v1.0
Question 1
What is the most important operational driver in building a resilient and secure modular network design?
- A. Minimize app downtime
- B. Reduce the frequency of failures requiring human intervention
- C. Increase time spent on developing new features
- D. Dependencies on hardware or software that is difficult to scale
Answer : A
Question 2
Refer to the exhibit. For Company XYZ, Bangkok is using ECMP to reach the 172.20.2.0/24 network. The company wants a design that would allow them to forward traffic from 172.16.2.0/24 toward 172.20.2.0/24 via the Singapore router as the preferred route. The rest of the traffic should continue to use ECMP. Which technology fulfills this design requirement?
- A. policy-based routing
- B. unequal-cost load balancing using variance
- C. route summarization
- D. LFA
Answer : A
Question 3
Company XYZ is running OSPF in their network. They have merged with another company that is running EIGRP as the routing protocol. Company XYZ now needs the two domains to talk to each other with redundancy, while maintaining a loop free environment. The solution must scale when new networks are added into the network in the near future. Which technology can be used to meet these requirements?
- A. single point route-redistribution with route filtering using route tags
- B. multipoint route-redistribution with route filtering using ACLs
- C. multipoint route-redistribution with route filtering using route tags
- D. single point route-redistribution with route filtering using ACLs
Answer : C
Question 4
What are two common approaches to analyzing and designing networks? (Choose two.)
- A. three-tier approach
- B. top-down approach
- C. high-low security approach
- D. bottom-up approach
- E. left-right approach
Answer : BD
Question 5
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 Area1. Now BGP must be deployed within AS100 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. Confederation should be set up with R1, R5, and R3 in one sub AS, with R2 and R4 in another, and redistribution at R1 and R2.
- C. R1, R2, R3 and R4 must be set up with a neighbor relationship with R5 only. R5 must not be a route reflector.
- D. A full mesh should be deployed between all the routers with mutual redistribution to take place at R1 and R2.
Answer : A
Question 6
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.)
- A. Advertise the two RP addresses in the routing protocol.
- B. Use two phantom RP addresses.
- C. Manipulate the multicast routing table by creating static mroutes to the two RPs.
- D. Control routing to the two RPs through a longest match prefix.
- E. Use Anycast RP based on MSDP peering between the two RPs.
- F. Manipulate the administrative distance of the unicast routes to the two RPs.
Answer : BC
Question 7
Refer to the exhibit. Which impact of using three or more ABRs between the backbone area and area 1 is true?
- A. In a large-scale network, multiple ABRs can create microloops.
- B. Multiple ABRs reduce the CPU processing on each ABR due to splitting prefix advertisement between areas.
- C. Prefixes from the non-backbone area are advertised by one ABR to the backbone area.
- D. In a large-scale network, LSA replication, by all ABRs, can cause serious scalability issues.
Answer : D
Question 8
Company XYZ runs OSPF in their network. A design engineer decides to implement hot-potato routing architecture. How can this implementation be achieved?
- A. Enable iBGP and apply prepend to ensure all prefixes will have the same length of the AS path attribute value.
- B. Redistribute the external prefixes onto OSPF and ensure that the total metric calculation includes external and internal values.
- C. Enable OSPF load-balancing over unequal cost path.
- D. 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 : B
Question 9
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
Answer : C
Question 10
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 summarization.
- B. Limit the query domain by use of default routes.
- C. Build neighbor adjacencies in a squared fashion.
- D. Limit the query domain by use of distribute lists.
- E. Build neighbor adjacencies in a triangulated fashion.
Answer : A
Question 11
DRAG DROP -
Drag and drop the multicast protocols from the left onto the correct design situations on the right.
Select and Place:
Answer : 
Question 12
Company XYZ, a global content provider, owns data centers on different continents. Their data center design involves a standard three-layer design with a Layer
3-only core. HSRP is used as the FHRP. They require VLAN extension across access switches in all data centers, and they plan to purchase a Layer 2 interconnection between two of their data centers in Europe. In the absence of other business or technical constraints, which termination point is optimal for the
Layer 2 interconnection?
- A. at the core layer, to offer the possibility to isolate STP domains
- B. at the aggregation layer because it is the Layer 2 to Layer 3 demarcation point
- C. at the access layer because the STP root bridge does not need to align with the HSRP active node
- D. at the core layer because all external connections must terminate there for security reasons
Answer : B
Question 13
Refer to the exhibit. An engineer is designing the network for a multihomed customer running in AS 111 AS 111 does not have any other ASs connected to it.
Which technology is more comprehensive to use in the design to make sure that the AS is not being used as a transit AS?
- A. Include an AS path access list to send routes to the neighboring ASs that only have AS 111 in the AS path field.
- B. Configure the AS-set attribute to allow only routes from AS 111 to be propagated to the neighbor ASs.
- C. Use the local preference attribute to configure your AS as a "non-transit" AS.
- D. Include a prefix list to only receive routes from neighboring ASs.
Answer : A
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. Fiber Ethernet connectivity with UDLD enabled
- B. Copper Ethernet connectivity with UDLD enabled
- C. Fiber Ethernet connectivity with BFD enabled
- D. Copper Ethernet connectivity with BFD enabled
Answer : C
Question 15
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. BPDU guard
- B. root guard
- C. loop guard
- D. BPDU filtering
Answer : C