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CCIE-Routing and Switching Written exam (3.1) : 350-001 Exam

Exam Number/Code: 350-001
Exam Name: CCIE-Routing and Switching Written exam (3.1)
VUE Code: 350-001
Questions Type: Single choice,
Question Numbers of Real-exam: 100 questions
Exam Language(s): English

“CCIE-Routing and Switching Written exam (3.1)”, also known as 350-001 exam, is a Cisco certification.
Preparing for the 350-001 exam Searching 350-001 Test Questions, 350-001 Exam, 350-001 Dumps

With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 315 Q&As to your 350-001 Exam preparation. In the 350-001 exam resources, you will cover every field and category in CCIE helping to ready you for your successful Cisco Certification.

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:
350-001
www.actualtest.org – The Power of Knowing
http://www.cisco.com/en/US/tech/ CK3 89/ CK6
21/technologies_configuration_example09186a008009467c.shtml
QUESTION 37
PassGuide 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.
350-001
www.actualtest.org – The Power of Knowing
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
Explanation:
In normal STP operation, a bridge keeps receiving configuration BPDUs from the root
bridge on its root port, but it never sends out a BPDU toward the root bridge. So, in order
to achieve that, a special BPDU called the topology change notification (TCN) BPDU
has been introduced. Thus, when a bridge needs to signal a topology change, it starts
sending TCNs on its root port. The designated bridge receives the TCN, acknowledges it,
and generates another one for its own root port. And so on until the TCN hits the root
bridge.
The TCN is a very simple BPDU that contains absolutely no information that a bridge
sends out every hello_time seconds (this is locally configured hello_time, not the
350-001
www.actualtest.org – The Power of Knowing
hello_time specified in configuration BPDUs). The designated bridge acknowledges the
TCN by immediately sending back a normal configuration BPDU with the topology
change acknowledgement (TCA) bit set. The bridge notifying the topology change will
not stop sending its TCN until the designated bridge has acknowledged it, so the
designated bridge answers the TCN even though it does not receive configuration BPDU
from its root.
The portfast feature is a Cisco proprietary change in the STP implementation. The
command is applied to specific ports and has two effects:
1. Ports coming up are put directly in the forwarding STP mode, instead of going through
the learning and listening process. Note that STP is still running on ports with portfast.
2. The switch never generates a TCN when a port configured for portfast is going up or
down.
Reference:
http://www.cisco.com/en/US/tech/ CK3 89/ CK6
21/technologies_tech_note09186a0080094797.shtml#portfastcomma
QUESTION 39
The PassGuide LAN is a bridged network running the 802.1D spanning tree protocol.
Which of the following are parameters that a bridge will receive from the root bridge.
A. Maxage
B. Root Cost
C. Forward delay
D. A,B, and C
E. None of the above
Answer: D
Explanation:
A, B and C are all located in the BPDU which each switch gets from the root bridge.
The BPDUs are in the following format:
1. Protocol ID – indicates that the packet is a BPDU.
2. Version – the version of the BPDU being used.
3. Message Type – the stage of the negotiation.
4. Flags – two bits are used to indicate a change in topology and to indicate
acknowledgement of the TCN BPDU.
5. Root ID – the root bridge priority (2 bytes) followed by the MAC address (6 bytes).
6. Root Path Cost – the total cost to from this particular bridge to the designated root
bridge.
7. Bridge ID – the bridge priority (2 bytes) followed by the MAC address (6 bytes),
lowest value wins! The default bridge priority is 0×8000 (3276810).
8. Port ID – the ID of the port from which are transmitted the BPDUs, a root port, this is
made up of the configured port priority and the bridge MAC address.
350-001
www.actualtest.org – The Power of Knowing
9. Message Age – timers for aging messages (only has effect on the network if the root
bridge is configured with this parameter).
10. Maximum Age – the maximum message age before information from a BPDU is
dropped because it is too old and no more BPDUs have been received. (only has effect on
the network if the root bridge is configured with this parameter). The default value for
this is 20 seconds.
11. Hello Time – the time between BPDU configuration messages sent by the root bridge
(only has effect on the network if the root bridge is configured with this parameter). The
default value for this is 2 seconds.
12. Forward Delay – this temporarily stops a bridge from forwarding data to give a
chance for information of a topology change to filter through to all parts of the network.
This means that ports that need to be turned off in the new topology have a chance to be
switched off before the new ports are turned on (only has effect on the network if the root
bridge is configured with this parameter).
Reference:

http://www.rhyshaden.com/ethernet.htm

QUESTION 40
A small office LAN contains only one switch, which was put in place without any of the
default configurations changed. You have noticed that somebody in the office has looped
a cable by connecting one end to port 4/37 and the other to port 4/38 as shown below:
All links are 10/100
Configuration is default
Which of the following statements is true?
A. Port 4/38 will be blocked.
B. Both ports will be forwarding.
C. Port 4/37 will be blocking.
D. Both ports will be blocked.
E. Port 4/38 will continuously move between the listening and learning states.
F. Port 4/37 will be stuck in the learning state.
Answer: A

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