CCIE Written: WAN Switching : 350-023 Exam

Exam Number/Code: 350-023
Exam Name:CCIE Written: WAN Switching

“CCIE Written: WAN Switching”, also known as 350-023 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 400 Q&As to your 350-023 Exam preparation. In the 350-023 exam resources, you will cover every field and category in CCIE helping to ready you for your successful Cisco Certification.
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Exam DetailsThe 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.

QUESTION 11:
Unlike X.25, Frame Relay is considered an “unacknowledged” protocol. Why?
A. It is older and less sophisticated than X.25.
B. There is no technological way to acknowledge frames.
C. LMI always acknowledges frame reception.
D. It counts on new and better transmission lines and end-device management.
Answer: D
QUESTION 12:
Exhibit
In the MPLS network shown, which subnets would be in the same Forwarding Equivalence
Class (FEC) on router PE1:
A. 172.16.3.0/24 and 193.1.1.0/28
B. 172.16.1.0/24 and 172.16.2.0/24
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C. 172.16.1.9/24 and 193.1.1.0/28
D. 172.16.1.0/24, 172.16.2.0/24 and 172.16.3.0/24
Answer: D
QUESTION 13:
TCP transports is used for all LDP message exchange categories except…?
A. Update
B. Session
C. Discovery
D. Hello
E. Advertisement
F. Notification
Answer: C

http://www.mplsrc.com/faq2.shtml#MPLS%20Components

QUESTION 14:
The two label distribution protocols that provide support for MPLS traffic engineering
are:
A. RSVP and OSPF
B. CR-LDP and IBGP
C. RSVP and CR-LDP
D. LPS and LDS
Answer: C

http://www.mplsrc.com/faq2.shtml

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QUESTION 15:
Intelligent Packet Discard Methods work on what premise?
A. That the cells carry non-critical traffic
B. That the VPI/VCI pair is low priority
C. That the cells come from large packets, segmented
D. That the TOS (type of service) field in the IP header prioritizes some cells
E. None of the above
Answer: C
Frame discard techniques embody the concept that if the network element must discard
cells, it is far more effective to do so at the frame level rather than at the cell level. An
ATM network can detect frame boundaries by evaluating the cell header. Under severe
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congestion situations, when a cell is dropped, the switch can immediately drop all cells
associated with that specific frame. To improve higher-layer protocol efficiency, the
switch should drop all cells except the cell thatsignals the end of the frame. This way, the
higher-layer protocol immediately detects a failure and requests retransmission upon
receiving an incomplete protocol data unit (PDU), instead of the source ES having to
wait for a higher-layer protocol timeout before retransmitting the PDU, or, even worse,
the boundary of the next PDU not being correctly identified and the next PDU also being
affected.
QUESTION 16:
Exhibit
In a reorganization at Certkiller .com, OSPF areas are realigned. Is this a valid network
design? If not, which changes could be made to the network and/or router configurations?
(Select two)
A. No changes are necessary.
B. A virtual link could be configured between Area 60 and Area 0.
C. A serial line or other physical connection could be installed between devices in Area 60 and
Area 0.
D. Router Certkiller 2 could be configured as an Area Border Router Certkiller Between Area 60
and Area 6.
E. This is not a valid design, and no changes can make it work.
Answer: B, C
All areas must touch Area 0 whether it is via a virtual link or a physical link.
QUESTION 17:
What is the Generic Flow Control (GFC) header in an ATM NNI cell used for?
A. Rate control between the ATM NNI switches
B. Rate control between UNI devices
C. GFC has local significance, only, and the value encoded in the field is not end-to-end.
D. None of the above
Answer: D

http://www.pulsewan.com/data101/atm_basics.htm

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QUESTION 18:
What configuration guarantees a level of Frame Relay service of 512K but reports a
guaranteed service of 1024K in LMI?
A. CIR=1024K, QIR=512K, MIR=512K, PIR=512K, percent utilization = 50%
B. CIR=512K, QIR=1024K, MIR=1024K, PIR=2048K, percent utilization = 50%
C. CIR=1024K, QIR=1024K, MIR=512K, PIR=2048K, percent utilization = 100%
D. CIR=512K, QIR=512K, MIR=1024K, PIR=512K, percent utilization = 100%
Answer: C
The IGX guarantees service based on MIR, so in order to guarantee 512K, you need MIR
x %util to = 512K
Reference:

http://www.cisco.com/en/US/products/hw/switches/ps525/products_technical_reference_chapter09186a00800d

9
QUESTION 19:
Exhibit
You work as a network engineer at Certkiller .com. Host Certkiller D sends a frame to Host
Certkiller B at the same time that Host Certkiller B sends a frame to Host Certkiller D.
Bridging is enabled on Router Certkiller 1 and the two frames collide into each other. Select
the best explanation of why Host Certkiller B will or will not receive the original frame from
Host Certkiller D:
A. Host Certkiller B will receive the frame, since Hosts Certkiller B and Certkiller D are in the
same VLAN.
B. Host Certkiller B will receive the frame, since Hosts Certkiller B and Certkiller D are in the
same routing domain.
C. Host Certkiller B will not receive the frame, since Hosts Certkiller B and Certkiller D are in the
same collision domain.
D. Host Certkiller B will not receive the frame, since Hosts Certkiller B and Certkiller D are in
different broadcast domains.
E. Host Certkiller B will receive the frame, since Hosts B and D are in the same bridging domain.
Answer: C
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QUESTION 20:
From the LSC perspective, the Label controlled interfaces (LC-ATM) are seen as:
A. ATM interfaces
B. Extended MPLS ATM (XmplsATM) interfaces
C. External Controlled ATM (ExtATM) interfaces
D. Switch interfaces
Answer: B

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