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350-023 : CCIE Written: WAN Switching Last Updated Friday, August 01, 2008 with 204 Questions

CCIE Written: WAN Switching
Exam Number: 350-023 Exam
Associated Certifications: CCIE Written: WAN Switching
Duration: 400 Q&As
Available Language(s): English
Exam Details
The written exam is a two-hour, multiple choice test with 100 questions covering areas such as Layer 2 networking, IP protocols, MPLS, VPN, security, quality of service and high availability technologies. The exam is closed book and no outside reference materials are allowed.
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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
There is no concept of a backup DIS in IS-IS.
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: D
QUESTION 3:
You work as a network engineer at Certkiller .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:
350-023
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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
QUESTION 6:
What is Fast EtherChannel?
A. A feature to bundle multiple Ethernet point-to-point links quickly into one logical high speed
link.
B. A feature to bundle multiple Fast-Ethernet point-to-point links into one logical high speed
link.
C. Another name for full-duplex Fast Ethernet
D. Another name for Gigabit Ethernet
E. None of the above
Answer: B
http://www.cisco.com/warp/public/cc/techno/media/lan/ether/channel/tech/fetec_wp.htm
QUESTION 7:
In ATM networks, SVCs: Select two.
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A. Need more overhead for setup than PVCs
B. Need less overhead for setup than PVCs
C. Use fixed end-to-end VPI/VCI pairs
D. Are automatically set up upon request by an end user device
Answer: A, D
An SVC is created and released dynamically and remains in use only as long as data is
being transferred. In this way it is similar to a telephone call. Dynamic call control
requires a signaling protocol between the ATM endpoint and the ATM switch. SVCs
provide connection flexibility and call setup that can be automatically handled by a
networking device. Setting up the connection requires extra time and overhead.
QUESTION 8:
Exhibit
You work as a network engineer at Certkiller .com. The diagram shows a collapsed L3
switched building backbone consisting of two L3 switches: W and U. Each L3 switch has a
routed interface on every subnet (VLAN) in the building. There are no VLAN trunks in the
network. In other words the L3 switches are acting as native routers. There are exactly 4
client-side VLANs (subnets): a, b, c, d. There are exactly 2 server-side VLANs (subnets): x
and y. There is one routed link (Subnet e) connecting the L3 switches in the core. How
many equal-cost paths to Subnet d does L3 Switch W keep in its routing table?
A. 1
B. 2
C. 3
D. 4
E. 5
Answer: A
QUESTION 9:
350-023
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The dspalm command output indicates an FRP/FTC communication failure. What is the
most likely cause?
A. The FRP/FTC failed.
B. The NPC/NPM failed.
C. The FRP/FTC isn’t receiving LMI status requests from the CPE.
D. The node has a power outage.
Answer: C
QUESTION 10:
What is true about the DLCI field in the Frame Relay header?
A. It consists of two portions, source and destination, which map data to a logical channel.
B. It generally has significance only between the local switch and the DTE device.
C. It is an optional field in the ITU-T specification.
D. It is present only in data frames sent through the network.
Answer: B