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Testking cisco 642-112

Vendor: cisco
Exam Code: 642-112
Exam Name: Converged Business (APE for Validating Knowledge )
cisco 642-112 value pack
642-112 Q & A with Explanations + 642-112 Study Guide + 642-112 Preparation Labs

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Question: 1
To eliminate the need for adjacent routers on broadcast networks to form n(n-1)/2 adjacencies,
IS-IS defines a pseudonode or Designated Intermediate System, DIS. All routers on the
broadcast medium form an adjacency with the DIS. The Backup DIS is called…?
A. Redundant DIS
B. BDR
C. There is no concept of a backup DIS in IS-IS
D. Designated Redundant System
Answer: C
Question: 2
For communication systems, what describes the over-all health of the system?
A. Bit-Error-Rate (BER)
B. Synchronous Optical NETwork (SONET)
C. Optical Signal to Noise Ratio (OSNR)
D. None of the above
Answer: A
Question: 3
You work as a network engineer at Company.com. There is a connection routed between two
IGXs on a single trunk. That trunk fails, and the connection re-routes via another IGX, so it is now
a two-hop connection. The failed trunk is repaired. Absent a preferred route, what happens?
A. The connection stays on the two-hop route and no message is sent.
B. The connection automatically returns to the single-hop route.
C. The connection stays on the two-hop route, but a warning message about extra hops is sent to
network management.
D. The connection automatically returns if the repaired route has more bandwidth.
Answer: A
The connection stays on the two-hop route and no message is sent.
Question: 4
A Permanent Virtual Path (PVP) connection switches cells by looking at the:
A. VPI/VCI
B. VCI
C. VPI
D. PTI
E. HEC
Answer: C
A PVP is a virtual path normally used between ATM switches. Using PVPs reduce the switching
time in ATM switches because the cells are switched based on their VPIs only.
Question: 5
In Frame Relay, the BECN bit is set by:
A. The Frame Relay network, to inform the DTE receiving the frame that congestion was
experienced in the path from source to destination.
B. The Frame Relay network, in frames traveling in the opposite direction from those frames that
encountered congestion.
C. The receiving DTE, to inform the Frame Relay network that it is overloaded and that the
switch should throttle back.
D. The sending DTE, to inform the Frame Relay network that it is overloaded and that the switch
should throttle back.
E. Any device that uses an extended DLCI address.
Answer: B

http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/frame.htm

Testking 642-112
Questions and Answers : 220 Q&As
Updated: 2008-10-16
Price: $125.99

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