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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.

TK

Exam Name: CCIE® Written: WAN Switching
Exam Type: CCIE
Exam Code: 350-023 Total Questions: 267

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.

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 Question: 8
Exhibit:

TK

Exam Name: CCIE® Written: WAN Switching
Exam Type: CCIE
Exam Code: 350-023 Total Questions: 267

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
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

TK

Exam Name: CCIE® Written: WAN Switching
Exam Type: CCIE
Exam Code: 350-023 Total Questions: 267

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

http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1918.htm#xtocid3

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
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: C 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

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Exam Number/Code: 350-023
Exam Name: CCIE Written: WAN Switching
VUE Code: 350-023
Questions Type: Multiple choice,
Question Numbers of Real-exam: 100 Question

“CCIE Written: WAN Switching”, also known as 350-023 exam, is a Cisco certification.
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Updated: Sep 10th , 2008
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