CCDA FAQ: Network Structure Models

CCDA FAQ: Network Structure Models

Q1. In the hierarchical network model, which layer is responsible for fast transport?
a. Network
b. Core
c. Distribution
d. Access

Answer: B. The core layer of the hierarchical model is responsible for fast transport.

Q2. Which Enterprise Architecture model component interfaces with the service provider (SP)?
a. Campus infrastructure
b. Access layer
c. Enterprise edge
d. Edge distribution

Answer: C. The enterprise edge consists of e-commerce, Internet connectivity, VPN/remote access, and WAN modules. The enterprise edge modules connect to SPs.

Q3. In the hierarchical network model, at which layer do security filtering, address aggregation, and media translation occur?
a. Network
b. Core
c. Distribution
d. Access

Answer: C. The distribution layer of the hierarchical model is responsible for security filtering, address and area aggregation, and media translation.

Q4. Which of the following is/are method(s) of workstation-to-router redundancy in the access layer?
a. AppleTalk Address Resolution Protocol (AARP)
b. Hot Standby Router Protocol (HSRP)
c. Virtual Router Redundancy Protocol (VRRP)
d. Answers B and C
e. Answers A, B, and C

Answer: D. HSRP and VRRP provide default gateway redundancy.

Q5. The network-management module has tie-ins to which component(s)?
a. Campus infrastructure
b. Server farm
c. Enterprise edge
d. SP edge
e. Answers a and b
f. Answers a, b, and c
g. Answers a, b, c, and d

Answer: F. The network management module monitors all components and functions except the SP edge.

Q6. Which of the following is an SP edge module in the Cisco Enterprise Architecture model?
a. Public switched telephone network (PSTN) service
b. Edge distribution
c. Server farm
d. Core layer

Answer: A. The SP edge includes Internet, PSTN, and WAN modules.

Q7. In which module would you place Cisco Unified Communications Manager (CUCM)?
a. Campus core
b. E-commerce
c. Server farm
d. Edge distribution farm

Answer: C. The server farm hosts campus servers including Cisco CallManager servers.

Q8. High availability, port security, and rate limiting are functions of which hierarchical layer?
a. Network
b. Core
c. Distribution
d. Access

Answer: D. The access layer functions are high availability, port security, rate limiting, ARP inspection, virtual access lists, and trust classification.

Q9. True or false: The core layer of the hierarchical model does security filtering and media translation.
Answer: False

Q10. True or false: The access layer provides high availability and port security.
Answer: True

Q11. You add Communications Manager to the network as part of a Voice over IP (VoIP) solution. In which submodule of the Enterprise Architecture model should you place Communications Manager?
Answer: The server farm.

Q12. True or false: HSRP provides router redundancy.
Answer: True

Q13. Which enterprise edge submodule connects to an ISP?
Answer: The Internet submodule.

Q14. List the six modules of the Cisco Enterprise Architecture model for network design.
Answer: Enterprise campus, enterprise edge, enterprise WAN, enterprise branch, enterprise data center, and enterprise teleworker.

Q15. True or false: In the Cisco Enterprise Architecture model, the network management submodule does not manage the SP edge.
Answer: True

Q16. True or false: You can implement a full-mesh network to increase redundancy and reduce a WAN’s costs.
Answer: False. A full-mesh network increases costs.

Q17. How many links are required for a full mesh of six sites?
Answer: Use n(n – 1)/2, where n = 6. 6 * (6 – 1)/2 = (6 * 5)/2 = 30/2 = 15

Q18. List and describe four options for multihoming to the SP between the Enterprise Edge and the SP Edge. Which option provides the most redundancy?
Answer:

  • Option 1: Single router, dual links to one ISP
  • Option 2: Single router, dual links to two ISPs
  • Option 3: Dual routers, dual links to one ISP
  • Option 4: Dual routers, dual links to two ISPs

Option 4 provides the most redundancy, with dual local routers, dual links, and dual ISPs.

Q19. To what enterprise edge submodule does the SP Edge Internet submodule connect?
Answer: The SP edge Internet submodule connects to the enterprise edge Internet submodule.

Q20. What are four benefits of hierarchical network design?
Answer: Cost savings, ease of understanding, easy network growth (scalability), and improved fault isolation.

Q21. In an IP telephony network, in which submodule or layer are the IP phones and CUCM servers located?
Answer: IP phones reside in the building access layer of the campus infrastructure. The CallManagers are placed in the server farm of the enterprise campus.

Q22. Match the redundant model with its description:
i. Workstation-router redundancy
ii. Server redundancy
iii. Route redundancy
iv. Media redundancy
a. Cheap when implemented in the LAN and critical for the WAN
b. Provides load balancing
c. Host has multiple gateways
d. Data is replicated

Answer: i = C, ii = D, iii = B, iv = A

Q23. True or false: Small to medium campus networks must always implement three layers of hierarchical design.
Answer: False. Small campus networks can have collapsed core and distribution layers and implement a two-layer design. Medium campus networks can have two-tier or three tier designs.

Q24. How many full-mesh links do you need for a network with ten routers?
Answer: Use the formula n(n – 1)/2, where n = 10. 10(10 – 1)/2 = 90/2 = 45 links.

Q25. Which layer provides routing between VLANs and security filtering?
a. Access layer
b. Distribution layer
c. Enterprise edge
d. WAN module

Answer: B. The distribution layer provides routing between VLANs and security filtering.

Q26. List the four modules of the enterprise edge area.
Answer: E-commerce, Internet, VPN/remote access, and WAN.

Q27. List the three submodules of the SP edge.
Answer: Internet services, WAN services, and PSTN services.

Q28. List the components of the Internet edge.
Answer: Firewalls, Internet routers, FTP/HTTP servers, SMTP mail servers, and DNS servers.

Q29. Which submodule contains firewalls, VPN concentrators, and ASAs?
a. WAN
b. VPN/remote access
c. Internet
d. Server farm

Answer: B. The VPN/remote access submodule contains firewalls, VPN concentrators, and ASAs.

Q30. Which of the following describe the access layer? (Select two.)
a. High-speed data transport
b. Applies network policies
c. Performs network aggregation
d. Concentrates user access
e. Provides PoE
f. Avoids data manipulation

Answer: D and E. The access layer concentrates user access and provides PoE to IP phones.

Q31. Which of the following describe the distribution layer? (Select two.)
a. High-speed data transport
b. Applies network policies
c. Performs network aggregation
d. Concentrates user access
e. Provides PoE
f. Avoids data manipulation

Answer: B and C. The distribution layer concentrates the network access switches and routers and applies network policies with access lists.

Q32. Which of the following describe the core layer? (Select two.)
a. High-speed data transport
b. Applies network policies
c. Performs network aggregation
d. Concentrates user access
e. Provides PoE
f. Avoids data manipulation

Answer: A and F. The core layer provides high-speed data transport without manipulating the data.

Q33. Which campus submodule connects to the enterprise edge module?
a. SP edge
b. WAN submodule
c. Building distribution
d. Campus core
e. Enterprise branch
f. Enterprise data center

Answer: D. The Campus Core connects to the server farm, the Enterprise Edge, and the Building Distribution.

Q34. Which remote module connects to the enterprise via the Internet or WAN submodules and contains a small LAN switch for users?
a. SP edge
b. WAN submodule
c. Building distribution
d. Campus core
e. Enterprise branch
f. Enterprise data center

Answer: E. The infrastructure at the remote site usually consists of a WAN router and a small LAN switch.

Q35. Which three types of servers are placed in the e-commerce submodule?
a. Web
b. Application
c. Database
d. Intranet
e. Internet
f. Public share

Answer: A, B, and C. Web, application, and database servers are placed in the e-commerce submodule.

Use Below Figure to answer questions 36–41.

ccda-faq-network-structure-models-q28-33

Q36. Which is the campus core layer?
Answer: Block 4.

Q37. Which is the enterprise edge?
Answer: Block 1.

Q38. Which is the campus access layer?
Answer: Block 6.

Q39. Which is the enterprise edge distribution?
Answer: Block 2.

Q40. Which is the campus distribution layer?
Answer: Block 5.

Q41. Which is the campus data center?
Answer: Block 3.

Q42. Which solution supports the enterprise teleworker?
a. IP telephony
b. Enterprise campus
c. Cisco virtual office
d. SP edge
e. Hierarchical design
f. Data Center 3.0

Answer: C. The Cisco Virtual Office supports the teleworker with router, VPN, and IP telephony.

Q43. Which are two benefits of using a modular approach?
a. Simplifies the network design
b. Reduces the amount of network traffic on the network
c. Often reduces the cost and complexity of the network
d. Makes the network simple by using full mesh topologies

Answer: A and C

Q44. Which three modules provide infrastructure for remote users? (Select three.)
a. Teleworker module
b. WAN module
c. Enterprise branch module
d. Campus module
e. Enterprise data center
f. Core, distribution, access layers

Answer: A, C, and E. The teleworker, branch, and data center modules are part of the enterprise remote modules.

Q45. Which are borderless networks infrastructure services? (Select three.)
a. IP telephony
b. Security
c. QoS
d. SP edge
e. High availability
f. Routing

Answer: B, C, and E. Security, QoS, and high availability are borderless network infrastructure services.

Q46. Which module contains devices that supports AAA and stores passwords?
a. WAN module
b. VPN module
c. Server farm module
d. Internet connectivity module
e. SP edge
f. TACACS

Answer: C. Servers are located in the server farm module of the enterprise campus area.

Q47. Which topology is best used for connectivity in the building distribution layer?
a. Full mesh
b. Partial mesh
c. Hub and spoke
d. Dual ring
e. EthernetChannel

Answer: B. Partial-mesh connectivity is best suited in the distribution layer.

Q48. What are two ways that wireless access points are used? (Choose two.)
a. Function as a hub for wireless end devices
b. Connect to the enterprise network
c. Function as a Layer 3 switch for wireless end devices
d. Provide physical connectivity for wireless end devices
e. Filter out interference from microwave devices

Answer: A and B. Wireless APs function as a hub to connect wireless end devices to the network.

Q49. In which ways does application network services helps resolve application issues?
a. It can compress, cache, and optimize content.
b. Optimizes web streams which can reduce latency and offload the web server.
c. Multiple data centers increases productivity.
d. Improves application response times by using faster servers.

Answer: A and B

Q50. Which are key features of the distribution layer?
a. Aggregates access layer switches
b. Provides a routing boundary between access and core layers
c. Provides connectivity to end devices
d. Provides fast switching
e. Provides transport to the enterprise edge
f. Provides VPN termination

Answer: A, B, and C

Q51. Which Cisco solution allows a pair of switches to act as a single logical switch?
a. HSRP
b. VSS
c. STP
d. GLB

Answer: B. VSS allows a Catalyst 6500 switch pair to act as a single logical switch.

Q52. Which module or layer connects the server layer to the enterprise edge?
a. Campus distribution layer
b. Campus data center access layer
c. Campus core layer
d. Campus MAN module
e. WAN module
f. Internet connectivity module

Answer: C

Q53. Which server type is used in the Internet connectivity module?
a. Corporate
b. Private
c. Public
d. Internal
e. Database
f. Application

Answer: C

Q54. Which server types are used in the e-commerce module for users running applications and storing data? (Select three.)
a. Corporate
b. Private
c. Public
d. Internet
e. Database
f. Application
g. Web

Answer: E, F, and G

Q55. Based on Figure, and assuming that devices may be in more than one layer, list which devices are in each layer.
ccda-faq-network-structure-models-q28-47
Access layer:
Distribution layer:
Core:

Answer: Access layer: A, D, E, F
Distribution layer: A, C, E, F
Core: B

Use Below Figure 2-21 to answer questions 56–58.

ccda-faq-network-structure-models-q48-50

Q56. Which section(s) belong to the core layer?
Answer: Only section B.

Q57. Which section(s) belong to the distribution layer?
Answer: Only section C.

Q58. Which section(s) belong to the access layer?
Answer: Sections A, D, and E belong to the access layer.

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James Palmer

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