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About 300-115 Exam
The Cisco 300-115 exam is the second of three tests that an individual should pass in order to obtain the Cisco Certified Network Professional (CCNP) Routing and Switching and Cisco Certified Design Professional (CCDP) credentials.
The Cisco 300-115 SWITCH exam is made up of 30-40 questions. The multiple-choice questions require you to give multiple answers. There are also scenario-based questions, fill-in-the-blank, and drag and drop. The duration of the test is 120 minutes. It is available in English and Japanese. Currently, there is no passing score that has been published by Cisco. The purpose of this certification exam is to test one’s capability to plan, configure, verify, implement, and troubleshoot complicated LAN switching solutions in an enterprise setting. These solutions are for enterprises that operate with the Cisco Enterprise Campus Architecture. In addition, the test covers largely secure WLANs and VLANs integration.
Exam topics:
The topics of the 300-115 exam act as guidelines for the candidates, so that they know what to focus on in their training. Although the content of the test may change and other related topics may be added, these are the general topics you can expect to find in this exam:
The study resources for the 300-115 exam should be Cisco-approved in the sense that they should be official study guides or other Cisco partner learning materials. It is a good idea to visit the Cisco Press website.
PrepAway Cisco CCNP Switch Certification Practice Test Questions Part 7 300-115 Exam
Which cisco proprietary spanning tree protocol which operates a separate instance of Spanning Tree Protocol (STP) for each individual VLAN?
- A. PVST
- B. RSTP
- C. STP
- D. MVST
- E. MPVST
Answer: A
Explanation:
Let’s go through the image shown below. All three switches are connected to each other and we need to ensure that spanning tree creates a loop free topology. So we have to block the links depending on which switch is the root bridge.
Let’s says that we create a VLAN 10 inbetween switch1 and switch 2. If we consider link Fa0/14 only between SW1 and SW2 then it is a loop free link but we still have to run spanning tree and spanning tree is run for each VLAN.
Taking another example where we have VLAN 20 comprising of SW1, SW2 & SW3. Here we have to calculate spanning tree for each vlan in order to make it loop free. This is because the physical topology is different than the logical topology. This is what is called as Per Vlan Spanning tree. Please see that this is a Cisco proprietary protocol.
ISL Trunking is used here to allow VLAN traffic for some VLANs while others are blocked. PVST can also do load balancing by forwarding some VLANs on one trunk and other VLANs on other trunk. As it runs one STP per VLAN, it will have more overheads.
Incorrect Answers:
B. RSTP: RSTP is defined in IEEE 802.1w. For the reason as STP can’t provide faster convergence, so this STP-evolution from one point of view, but not separate instance of each VLAN as well. For example, if you connect a host to a switch, it goes through the process of listening & learning and will take approx. 30 seconds to turn into forwarding. If we enable the feature called port fast (Cisco Proprietary) the edge port will immediately turn into a forwarding port thus by saving 30 seconds. In short, if you are using RSTP, then you do not need to enable portfast on the switch and this is the way through which we speed up convergance on the access ports.
C. STP: Defined in IEEE 802.1D, this is the original standard that provided a loop-free topology in a network with redundant links. It is enabled by default on all Cisco Catalyst switches. STP stops broadcast storms, Multiple frame copies & Database Instability.
D. MSTP: defined in IEEE 802.1s, maps multiple VLANs into the same spanning-tree instance. MSTP implemented by Cisco is often referred to as Multiple Spanning Tree (MST). Here we can define set of VLANs to be mapped. For ex, if I have 20 VLANs and I am using PVST then I will have 20 STP running. In MSTP, we can run multiple instances by grouping 20 VLANs (1 to 20) into 2 instances by grouping them (1 to 10) and from (11 to 20).
e. MPVST: No such protocol exists.
