Designing Cisco Network Service Architectures Exam : 642-873 Exam
642-873 ARCH
Designing Cisco Network Service Architectures Exam

Exam Number: 642-873
Associated Certifications: CCDP
Duration: 75 minutes (60 – 70 questions)
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The 642-873 ARCH Designing Cisco Network Service Architectures Exam is the exam associated with the CCDP certification. This exam tests a candidate’s knowledge of the latest development in network design and technologies, including network infrastructure, intelligent network services and converged network solutions. Candidates can prepare for this exam by taking the ARCH Designing Cisco Network Service Architectures course.

Exam Topics
The following topics are general guidelines for the content likely to be included on the Remote Access exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposes, the guidelines below may change at any time without notice.

Design advanced core enterprise networks
Design campus Infrastructure using best practices
Design a High Availability enterprise network
Design a high availability WAN
Design network management services
Design IP multicast services
Describe enterprise VoWLAN design considerations

Design an enterprise data center
Design a high availability data center network that is modular, flexible and meets standards
Describe the components and technologies of a SAN network
Design an effective E-Commerce module

Design security services
Utilize firewalls
Utilize the NAC appliance
Utilize IPsec VPNs

Exam Number/Code: 642-873
Exam Name:Designing Cisco Network Service Architectures Exam

“Designing Cisco Network Service Architectures Exam”, also known as 642-873 exam, is a Cisco certification. With the complete collection of questions and answers, Passguides has assembled to take you through 130 Q&As to your 642-873 Exam preparation. In the 642-873 exam resources, you will cover every field and category in CCDP helping to ready you for your successful Cisco Certification.
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QUESTION 11
Which two statements are correct regarding Flex links? (Choose two.)
A. Flex links operate only over single pairs of links
B. Flex Links automatically disable STP so no BPDUs are propagated
C. Failover from active to standby on Flex Links takes less than a second
D. Flex Link pairs must be of the same interface type
E. An interface can belong to multiple Flex links
Answer: A,B
QUESTION 12
One of your customers is using the G.711 codec with 802.11a access point radios. This
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can support a maximum of how many phones per access point?
A. 8
B. 14
C. 23
D. 7
E. 19
Answer: B
QUESTION 13
What is the purpose of IGMP in a multicast implementation?
A. It determines whether Bidirectional PIM or PIM sparse mode will be used for a
multicast flow
B. It is used on WAN connections to determine the maximum bandwidth of a connection
C. It dynamically registers individual hosts in a multicast group on a specific LAN
D. It is not used in multicast
E. It determines the virtual address group for a multicast destination
Answer: C
QUESTION 14
What is meant by the term “firewall sandwich”?
A. Firewall connections in either an active or standby state
B. A method of operating firewalls from multiple vendors
C. Multiple layers of firewalling
D. An architecture in which all traffic between firewalls goes through
application-specific servers
E. An Architecture in which all traffic between firewalls goes through
application-specific gateway
Answer: C
QUESTION 15
Which of these statements is true of clientless end-user devices?
A. They do not receive unique IP Addresses
B. RADIUS or LDAP is required in order to assign IP Addresses
C. Their traffic appears to originate from the originating host network
D. They are assigned addresses from the internal DHCP pool
Answer: A
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QUESTION 16
How does ERS use the VLAN tag?
A. As a mapping to the DLCI in service internetworking
B. To support transparency for Layer 2 frames
C. As a connection identifier to indicate destination
D. To provide service internetworking
E. To provide a trunk by which all VLANs can navigate from one site to one or multiple
sites
Answer: C
QUESTION 17
Which of these terms refers to call issues that cause variations in timing or time of
arrival?
A. Digitized sampling
B. Queuing
C. Packet Loss
D. Jitter
E. Signal-to-noise ratio ratio
Answer: D
QUESTION 18
What two descriptions best define DWDM? (Choose two.)
A. A technology for transmitting multiple optical signals using less sophisticated
transceiver designs then CWDM
B. A WDM system that is compatible with EDFA technology
C. An optical technology for transmitting up to 32 channels over multiple fiber strands
D. An optical technology for transmitting up to 16 channels over multiple fiber strands
E. A technology for transmitting more closely packed optical signals using more
sophisticated transceiver designs than CWDM
Answer: B,E
QUESTION 19
Which two design concerns must be addressed when designing a multicast
implementation? (Choose two.)
A. The 0x01004f MAC address prefix is used for mapping IP Addresses to MAC
addresses
B. Only the low-order 24 bits of the MAC address are used to map IP Addresses
C. Only the low-order 23 bits of the IP Address are used to map MAC addresses
D. Only the high-order 23 bits of the MAC address are used to map IP Addresses
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E. The 0x01005e MAC address prefix is used for mapping IP Addresses to MAC
addresses
F. Only the low-order 23 bits of the MAC address are used to map IP Addresses
Answer: C, E
QUESTION 20
Which two of these are characteristics of an IDS sensor? (Choose two.)
A. Has promiscuous interface that is used to monitor the network
B. Passively listens to network traffic
C. In an active device in the traffic path
D. Traffic arrives on one IDS interface and exits on another
E. Has a permissive interface that is used to monitor network
Answer: A,B

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