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Important Info — Cisco 642-813 new study guide are designed to help you pass the exam in a short time.Everything you need can be found in the new version Cisco 642-813 exam dumps.Visit Flydumps.com to get more valid information.
Exam A
QUESTION 1
Acme is a small export company that has an existing enterprise network comprised of 5 switches;
CORE,DSW1,DSW2,ASW1 and ASW2. The topology diagram indicates their desired pre-VLAN spanning
tree mapping.
Previous configuration attempts have resulted in the following issues:
每
CORE should be the root bridge for VLAN 20; however, DSW1 is currently the root bridge for VLAN 20.
每
Traffic for VLAN 30 should be forwarding over the gig 1/0/6 trunk port between DSW1 and DSW2. However VLAN 30 is currently using gig 1/0/5.
每
Traffic for VLAN 40 should be forwarding over the gig 1/0/5 trunk port between DSW1 and DSW2. However VLAN 40 is currently using gig 1/0/6.
You have been tasked with isolating the cause of these issuer and implementing the appropriate solutions. You task is complicated by the fact that you only have full access to DSW1, with isolating the cause of these issues and implementing the appropriate solutions. Your task is complicated by the fact that you only have full access to DSW1, with the enable secret password cisco. Only limited show command access is provided on CORE, and DSW2 using the enable 2 level with a password of acme. No configuration
\
Correct Answer: configure terminal spanning-tree vlan 20 priority 61440 interface g1/0/6 spanning-tree vlan 30 port-priority 64 exit interface g1/0/5 spanning-tree vlan 40 cost 1 show spanning-tree copy run start
Section: (none) Explanation
Explanation/Reference:
By using the ※show spanning-tree§ command as shown above, we learned that DSW1 is the root bridge for VLAN 20 (notice the line ※This bridge is the root§
To determine the root bridge, switches send and compare their priorities and MAC addresses with each other. The switch with the lowest priority value will have highest priority and become the root bridge. Therefore, we can deduce that the priority of DSW1 switch is lower than the priority of the CORE switch so it becomes the root bridge. To make the CORE the root bridge we need to increase the DSW1∩s priority value, the best value should be 61440 because it is the biggest value allowed to assign and it will surely greater than of CORE switch. (You can use another value but make sure it is greater than the CORE priority value by checking if the CORE becomes the root bridge or not; and that value must be in increments of 4096).
(Notice that the terms bridge and switch are used interchangeably when discussing STP)
2) ※Traffic for VLAN 30 should be forwarding over the gig 1/0/6 trunk port between DSW1 and DSW2. However VLAN 30 is currently using gig 1/0/5∪
DSW1 is the root bridge for VLAN 30 (you can re-check with the show spanning-tree command as above), so all the ports are in forwarding state for VLAN 30. But the question said that VLAN 30 is currently using Gig1/0/5 so we can guess that port Gig1/0/6 on DSW2 is in blocking state (for VLAN 30 only), therefore all traffic for VLAN 30 will go through port Gig1/0/5.
The root bridge for VLAN 30, DSW1, originates the Bridge Protocol Data Units (BPDUs) and switch DSW2 receives these BPDUS on both Gig1/0/5 and Gig1/0/6 ports. It compares the two BPDUs received, both have the same bridge-id so it checks the port cost, which depends on the bandwidth of the link. In this case both have the same bandwidth so it continues to check the sender*s port id (includes port priority and the port number of the sending interface). The lower port-id value will be preferred so the interface which received this port-id will be the root and the other interface (higher port-id value) will be blocked.
In this case port Gig1/0/6 of DSW2 received a Priority Number of 128.6 (means that port priority is 128 and port number is 6) and it is greater than the value received on port Gig1/0/5 (with a Priority Number of 128.5) so port Gig1/0/6 will be blocked. You can check again with the ※show spanning-tree§ command. Below is the output (notice this command is issued on DSW1 每 this is the value DSW2 received and used to compare).
Therefore, all we need to do is to change the priority of port Gig1/0/6 to a lower value so the neighboring port will be in forwarding state. Notice that we only need to change this value for VLAN 30, not for all VLANs.
) ※Traffic for VLAN 40 should be forwarding over the gig 1/0/5 trunk port between DSW1 and DSW2. However VLAN 40 is currently using gig 1/0/6∪
Next we need to make sure traffic for VLAN 40 should be forwarding over Gig1/0/5 ports. It is a similar job, right? But wait, we are not allowed to make any configurations on DSW2, how can we change its port-priority for VLAN 40? There is another solution for this#
Besides port-priority parameter, there is another value we can change: the Cost value (or Root Path Cost). Although it depends on the bandwidth of the link but a network administrator can change the cost of a spanning tree, if necessary, by altering the configuration parameter in such a way as to affect the choice of the root of the spanning tree.
Notice that the Root Path Cost is the cost calculated by adding the cost in the received hello to the cost of the interface the hello BPDU was received. Therefore if you change the cost on an interface of DSW1 then only DSW1 will learn the change.
By default, the cost of a 100Mbps link is 19 but we can change this value to make sure that VLAN 40 will use interface Gig1/0/5.
You should re-check to see if everything was configured correctly:
Remember these facts about Spanning-tree:
Path Selection:
1) Prefer the neighbor advertising the lowest root ID 2) Prefer the neighbor advertising the lowest cost to root 3) Prefer the neighbor with the lowest bridge ID 4) Prefer the lowest sender port ID
QUESTION 2
A. place unused ports in a common VLAN
B. implement private VLANs
C. implement DHCP SNOOPING
D. implement port security
E. implement VLAN access maps
Correct Answer: DE Section: (none) Explanation
Explanation/Reference:
QUESTION 3
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 4 Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 5
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 6
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 7
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 8
A. 50
B. 100
C. 150
D. 200
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 9
Correct Answer: SW-A int range fa0/9 每 10 switchport mode access switchport access vlan 21 spanning-tree portfast no shut int range fa0/13 每 14 switchport mode access switchport access vlan 22 spanning-tree portfast no shut int range fa0/16 每 16 switchport mode access switchport access vlan 23 spanning-tree portfast no shut int range fa0/3 每 4 channel-protocol lacp channel group 1 mode passive no shut int port-channel 1 switchport mode trunk switchport trunk encapsulation dot1q spanning-tree allowed vlans 1,21-23 no shut int vlan 1 ip address 192.168.1.11 255.255.255.0 no shut Sw-B
Section: (none) Explanation
Explanation/Reference:
QUESTION 10 Section: (none) Explanation Explanation/Reference:
QUESTION 11
Correct Answer: ACD Section: (none) Explanation
Explanation/Reference:
QUESTION 12
A.
B.
C.
D.
E.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 13
Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
QUESTION 14
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 15 Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 16 Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 17
Drag and drop
Select and Place:
Correct Answer:
Section: (none) Explanation
Explanation/Reference: QUESTION 18
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
A. isolated
B. protected
C. private
D. associatd
E. promiscuous
F. community
Correct Answer: AEF Section: (none) Explanation
Explanation/Reference:
QUESTION 20
A.
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
CCNA Exam Certification Guide is a best-of-breed Cisco 642-813 exam study guide that has been completely updated to focus specifically on the objectives.Senior instructor and best-selling author Wendell Odom shares preparation hints and Cisco 642-691 tips to help you identify areas of weakness and improve both your conceptual and hands-on knowledge.Cisco 642-813 Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics.
Written by Ralph K. Merritt
We are here to help you study for Cisco certification exams. We know that the Cisco series (CCNP, CCDE, CCIE, CCNA, DevNet, Special and other certification exams are becoming more and more popular, and many people need them. In this era full of challenges and opportunities, we are committed to providing candidates with the most comprehensive and comprehensive Accurate exam preparation resources help them successfully pass the exam and realize their career dreams. The Exampass blog we established is based on the Pass4itsure Cisco exam dump platform and is dedicated to collecting the latest exam resources and conducting detailed classification. We know that the most troublesome thing for candidates during the preparation process is often the massive amount of learning materials and information screening. Therefore, we have prepared the most valuable preparation materials for candidates to help them prepare more efficiently. With our rich experience and deep accumulation in Cisco certification, we provide you with the latest PDF information and the latest exam questions. These materials not only include the key points and difficulties of the exam, but are also equipped with detailed analysis and question-answering techniques, allowing candidates to deeply understand the exam content and master how to answer questions. Our ultimate goal is to help you study for various Cisco certification exams, so that you can avoid detours in the preparation process and get twice the result with half the effort. We believe that through our efforts and professional guidance, you will be able to easily cope with exam challenges, achieve excellent results, and achieve both personal and professional improvement. In your future career, you will be more competitive and have broader development space because of your Cisco certification.
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