Network class - August 20th [Community Learning Week • Phase 5] Activity

【Answer】1. ABCD    2. B    3. ABCD    4. ABCD    5. B

【Winner】phuta,    kita,    DKetrari,    thisu,   Vien

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Hello, everyone!

Join the Community Learning week Network Routing&Switching Ethernet Switching Basics!

Network class learning time of this phase: August 16th – August 20th.
Answer time of this class: August 20th, 8 AM - August 21st, 4 PM (UTC+0).

Class topic

Post 1. Ethernet switching - RSTP

STP ensures a loop-free network but has a slow network topology convergence speed, leading to service deterioration. If the network topology changes frequently, the connections on the STP-enabled network are frequently torn down, causing frequent service interruption. Users can hardly tolerate such a situation...More

Post 2. MSTP Background

RSTP, an enhancement to STP, implements fast convergence of the network topology. There is a defect for both RSTP and STP: All VLANs on a LAN use one spanning tree, and thus VLAN-based load balancing cannot be performed. Once a link is blocked, it will no longer transmit traffic, wasting bandwidth and causing the failure in forwarding certain VLAN packets...More

Post 3. Basic MSTP Concepts

MSTP network consists of one or more MST regions. Each MST region contains one or more MSTIs. An MSTI is a tree network consisting of switching devices running STP, RSTP, or MSTP...More

Post 4. MST BPDUs

MSTP calculates spanning trees on the basis of Multiple Spanning Tree Bridge Protocol Data Units (MST BPDUs). By transmitting MST BPDUs, spanning tree topologies are computed, network topologies are maintained, and topology changes are conveyed...More

Post 5. MSTP Topology Calculation

In MSTP, the entire Layer 2 network is divided into multiple MST regions, which are interconnected by a single CST. In an MST region, multiple spanning trees are calculated, each of which is called an MSTI. Among these MSTIs, MSTI 0 is also known as the internal spanning-tree (IST). Like STP, MSTP uses configuration messages to calculate spanning trees, but the configuration messages are MSTP-specific...More

Class Questions

After attending this class, please answer the following questions and comment with the answers below this post.

1. (Multiple-Choices Question) What port roles are defined in RSTP?

A. root port

B. designated port

C. alternate port

D. backup port

2. To fix the defect of STP and RSTP, the IEEE released 802.1D in 2002, defining the Multiple Spanning Tree Protocol (MSTP). MSTP implements fast convergence and provides multiple paths to load balance VLAN traffic.

A. True

B. False

3. (Multiple-Choices Question) What are the characteristics of a switching device in an MST region?

A. MSTP-enabled

B. Same region-name

C. Same VLAN-MSTI mappings

D. Same MSTP revision level

4. (Multiple-Choices Question) What are the contents of the MST Configuration Identifier field?

A. Configuration Identifier Format Selector

B. Configuration Name

C. Revision Level

D. Configuration Digest

5. Which of the following priority vectors are not involved in MSTI calculation?

A. region root ID

B. external root path cost

C. Designated port ID

D. Receiving port ID

Hope you get good grades, come and enjoy this learning party! 

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