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Practice Exam 350-018
Product Description:
Exam Number/Code: 350-018
Exam Name: CCIE

“CCIE ’s CCIE Pre-Qualification Test for Security”, also known as 350-018 exam, is a Cisco certification.
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CCIE Pre-Qualification Test for Security

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QUESTION 39
The Certkiller 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.
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
Explanation:
Port priority is based on lowest priority, and lowest port number. Because of this, then
4/37 would become the root port and 4/38 would be blocking. The default mode of a
Catalyst switch is to enable the STP process for all VLANs.
Incorrect Answers:
B. Even though this switch will effectively become the root switch, and all ports in a root
switch should be in the “forwarding state” a loop will occur in this case, and so one of the
ports must be blocking. Since the priority of 4/38 is lower by default, it will be blocking.
QUESTION 41
Which of the following statements regarding Transparent Bridge tables are FALSE?
(Choose all that apply.)
A. Decreasing the bridge table aging time would reduce flooding.
B. Increasing the bridge table aging time would reduce flooding.
C. Bridge table entries are learned by way of examining the source MAC address of each
frame.
D. Bridge table entries are learned by examining destination MAC addresses of each
frame.
E. The bridge aging time should always be more than the aggregate time for detection
and recalculation of the spanning tree.
Answer: A, D