CN8812: Solution Problem Set 1
网络工程作业代写 (d) S5 detects the failure immediately. It will then put port 3 in the learning state. After 30 seconds, the port will transition to ···
1.(a) Designated cost in each LAN segment: 网络工程作业代写
(d) S5 detects the failure immediately. It will then put port 3 in the learning state. After 30 seconds, the port will transition to the forwarding state.
2.(a)
o Port 1: ppv(B0, 23, B1, 1, 1), (Root Port)
o Port 2: ppv(B0, 42, B2, 2, 2), (Alternate Port)
o Port 3: ppv(B0, 223, B5, 3, 3), (Designated Port)
o Port 4: ppv(B0, 223, B5, 4, 4), (Designated Port)
(b)
o STP – B5 will ignore the inferior BPDU. When the port priority vector ages out, it will then make port 2 a designated port and put it into the learning state (assuming that the root port priority vector does not age out).
o RSTP – B5 will put port 2 in designated port role and discarding state. It then sends out proposal BPDU. If Agreement BPDU is received, port 2 will transition to forwarding state immediately.
3.The state transitions and BPDU exchanges are shown in the diagram below: 网络工程作业代写
It will take 1 sec for the ports connecting B1 and B2 to transition to the forwarding state (0.5 sec to send and process the proposal BPDU and another 0.5 sec to send and process the agreement BPDU). It takes another 0.5 sec for B2 to receive and process the agreement BPDU sent by B3. Finally, it takes another 0.5 sec for B3 to receive and process the agreement BPDU sent by B4. The total convergence time for the new active spanning tree is 2 sec.
4.Reception of the first packet: The switch creates the following multicast address entry in the filtering database: 0x 0100.5e07.0101 – port 3. It also forwards the IGMP packet to the multicast router.
Reception of the second packet: The switch creates the following multicast address entry in filtering database: 0x 0100.5e07.0101 – port 2. However, the bridge does not forward the IGMP packet to the multicast router.
Reception of the third packet: The bridge Just discards the packet.
Reception of the fourth packet: The bridge responds with a IGMP_Query packet sending out of port 2. If it receives an IGMP_Join(224.135.1.1), it will keep the multicast entry. If it does not receive any IGMP_Join(224.135.1.1), it will delete the port-2 entry.
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