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网络工程代写 – Network Engineering代写 – CN8812
网络工程代写

网络工程代写 – Network Engineering代写 – CN8812

CN8812: Problem set 1

 

 

网络工程代写 All the switch ports have the data rate of 100 Mbps. The bridge IDs (BIDs) of these switches are related as follows:BID of S1 <BID of S2 < BID ···

 

1.The following LAN consists of five Ethernet switches:  网络工程代写

All the switch ports have the data rate of 100 Mbps. The bridge IDs (BIDs) of these switches are related as follows:

BID of S1 <BID of S2 < BID of S3 < BID of S4 < BID of S5.

Determine the following spanning-tree parameters:

  1. The designated cost for each segment;
  2. The root path cost for each bridge;
  3. The status of each port (blocking, designated, or root port);
  4. If segment 6 is broken, estimate the time it takes before the new spanning tree converges. Give detailed explanation.
  1. A bridge, whose Bridge ID is B5, has four 100-Mbps ports. Suppose it received the

following BPDUs from its ports:

  1. Port 1: RBID=B0, RPC=23, SBID=B1, SPort=1
  2. Port 2: RBID=B0, RPC=42, SBID=B2, SPort=2
  3. Port 3: RBID=B0, RPC=57, SBID=B3, SPort=3
  4. Port 4: RBID=B4, RPC=0, SBID=B4, SPort=4

Assume that $B0 < B1 < B2 < B3 < B4$.

  1. Determine the port priority vectors and the port roles of the ports
  2. If bridge 5 subsequently received a BPDU on port 2 containing the following

information:

RBID=B0, RPC=46, SBID=B2, SPort=2

Describe the reaction of bridge 5 if it is using

1.STP

2.RSTP

3.Consider the following LAN:

Assume that:  网络工程代写

B1_ID < B2_ID < B3_ID < B4_ID < B5_ID < B6_ID,

where Bn_ID is the bridge ID of Bn. Suppose a new link is established between B2 and B1, determine the time it takes for the new spanning tree to converge, if Rapid Spanning tree protocol is used. Assume that a BPDU takes a total of 0.5 sec to be generated, transmitted, received, and processed and that a bridge can transmit multiple BPDUs at the same time. Sketch the sequence of state changes and Proposal/Agreement BPDU exchanges among the bridges

4.A bridge configured with IGMP snooping received the following three IGMP packets at times t1, t2, t3 and t4, where t1 < t2 < t3 < t4:

  1. t=t1: IGMP_Join(225.135.1.1) received at port 3.
  2. t=t2: IGMP_Join(225.135.1.1) received at port 2.
  3. t=t3: IGMP_Join(225.135.1.1) received at port 2.
  4. t=t4: IGMP_Leave(225.135.1.1) received at port 2.

Describe the action to be taken by the bridge upon the reception of each of these packets.

 

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