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Exam Code: 300-365
Exam Name: Deploying Cisco Wireless Enterprise Networks
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300-365 Practice Test Total Q&A: 62 Questions and Answers
Last Update: 09-28,2016

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Exam Code: 300-115
Exam Name: Implementing Cisco IP Switched Networks (SWITCH v2.0)
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300-115 Test Answers Total Q&A: 191 Questions and Answers
Last Update: 09-28,2016

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NO.1 When two MST instances (MST 1 and MST 2) are created on a switch, what is the total number
of spanning-tree instances running on the switch?
A. 1
B. 3
C. 2
D. 4
Answer: B
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Explanation:
Unlike other spanning tree protocols, in which all the spanning tree instances are independent, MST
establishes and maintains IST, CIST, and CST spanning trees:
An IST is the spanning tree that runs in an MST region.
Within each MST region, MST maintains multiple spanning tree instances. Instance 0 is a special
instance for a region, known as the IST. All other MST instances are numbered from
1 to 4094. In the case for this question, there will be the 2 defined MST instances, and the special 0
instance, for a total of 3 instances.
The IST is the only spanning tree instance that sends and receives BPDUs. All of the other spanning
tree instance information is contained in MSTP records (M-records), which are 68sername6868eed
within MST BPDUs. Because the MST BPDU carries information for all instances, the number of
BPDUs that need to be processed to support multiple spanning tree instances is 68sernamcantly
reduced. All MST instances within the same region share the same protocol timers, but each MST
instance has its own topology parameters, such as root bridge ID, root path cost, and so forth. By
default, all VLANs are assigned to the IST. An MST instance is local to the region; for example, MST
instance 1 in region A is independent of
MST instance 1 in region B, even if regions A and B are interconnected.
A CIST is a collection of the ISTs in each MST region.
The CST interconnects the MST regions and single spanning trees.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/122SX/configuration/guide/b
ook/spantree.html

Implementing Cisco IP Switched Networks

Exam Number 300-115 SWITCH
Associated Certifications CCNP Routing and Switching
CCDP
Duration 120 minutes (45-65 questions)
Available Languages English
Register Pearson VUE
Exam Policies Read current policies and requirements
Exam Tutorial Review type of exam questions

Implementing Cisco IP Switched Networks (SWITCH 300-115) is a qualifying exam for the Cisco CCNP Routing and Switching and CCDP certifications. The SWITCH 300-115 exam certifies the switching knowledge and skills of successful candidates. They are certified in planning, configuring, and verifying the implementation of complex enterprise switching solutions that use the Cisco Enterprise Campus Architecture.