350-001 Exam: Tk’s Cisco Certified Internetworking Expert ( CCIE ) Exams
350-001 Exam: Tk’s Cisco Certified Internetworking Expert ( CCIE ) Exams
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QUESTION 36
You need to troubleshoot a Spanning Tree issue on one of your LAN segments, and
you want to manipulate the path cost. Spanning tree protocol calculates path cost
based on what?
A. Interface Bandwidth
B. Hop-Count
C. Interface delay
D. Interface Bandwidth and delay
E. Bridge Priority
F. None of the above
Answer: A
Explanation:
STP calculates the path cost based on the media speed (bandwidth) of the links between
switches and the port cost of each port forwarding frame. Spanning tree selects the root
port based on the path cost. The port with the lowest path cost to the root bridge becomes
the root port. The root port is always in the forwarding state.
Reference:
http://www.cisco.com/en/US/tech/ CK3 89/ CK6
21/technologies_configuration_example09186a008009467c.shtml
QUESTION 37
Certkiller is utilizing Unidirectional Link Detection (UDLD) in their LAN. What are
the characteristics and benefits of UDLD? (Choose three)
A. UDLD prevents spanning tree loops caused by one way link conditions
B. UDLD detects wiring mistakes when receive and transmit twisted pairs are not
connected to the correct pinouts
C. UDLD detects wiring mistakes when receive and transmit fibers are not connected to
the same port on the remote side
D. UDLD prevents spanning tree loops caused by link speed and duplex configuration
mismatches
E. UDLD protects against a situation where light is received on both sides of a fiber GE
link (link up) but the fiber optic hardware is not communicating correctly
Answer: A, C, E
Explanation:
The UDLD protocol allows devices connected through fiber-optic or copper Ethernet
cables (for example, Category5 cabling) to monitor the physical configuration of the
cables and detect when a unidirectional link exists. When a unidirectional link is
detected, UDLD shuts down the affected port and alerts the user. Unidirectional links can
cause a variety of problems, including spanning-tree topology loops.
UDLD is a Layer2 protocol that works with Layer 1 mechanisms such as autonegotiation
to determine the physical status of a link. At Layer1, autonegotiation handles physical
signaling and fault detection. UDLD also performs tasks that autonegotiation cannot
perform such as detecting the identities of neighbors and shutting down misconnected
ports. When both autonegotiation and UDLD are enabled, Layer1 and Layer2 detection
features can work together to prevent physical and logical unidirectional connections and
malfunctioning of other protocols.
A unidirectional link occurs whenever traffic transmitted by the local device over a link
is received by the neighbor but traffic transmitted from the neighbor is not received by
the local device. For example, if one of the fiber strands in a pair is disconnected, as long
as autonegotiation is active the link does not stay up. In this situation, the logical link is
undetermined, and UDLD does not take any actions. If both fibers are working normally
at Layer1, then UDLD at Layer 2 determines whether those fibers are connected
correctly and whether traffic is flowing bidirectionally between the correct neighbors.
This check cannot be performed by autonegotiation, because autonegotiation is a Layer1
feature.
The switch periodically transmits UDLD messages (packets) to neighbor devices on ports
with UDLD enabled. If the messages are echoed back to the sender within a specific time
frame and they are lacking a specific acknowledgment (echo), the link is flagged as
unidirectional and the port is shut down. Devices on both ends of the link must support
UDLD in order for the protocol to successfully identify and disable unidirectional links.
Reference:
http://www.cisco.com/en/US/docs/switches/lan/catalyst5000/catos/5.x/configuration/guide/udld.html#wp10198
4
QUESTION 38
In a bridged LAN, the number if BPDU’s with the TCA bit set is incrementing rapidly.
What could be the cause of this? (Choose all that apply).
A. BPDU’s with the TCA bit set is part of the normal operation of a bridged LAN.
B. Improper cabling is being used in the network.
C. There is no spanning tree portfast configured on the ports connecting 2 workstations.
D. The root switch is experiencing problems due to high CPU utilization and is not
sending any BPDUs.
E. None of the above.
Answer: B, C
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Thanks very much