1.(6pts) An Ethernet network is illustrated below. Use the STP algorithm to eliminate switching loops to answer the questions below. Assume the link cost for 10Mbps=100, 100Mbps = 19 and 1Gbps = 4Identifythe root bridgeALL of the root ports(identify by using the bridge id – port id)ALL of the blocked ports(identify by using the bridge id – port id)P2B300P1P11Gbps100MbpsP2P2P1100MbpsB400B100P110MbpsP3P3P4B6001Gbps10Mbps1GbpsP2100MbpsP1P2P3P2P1B200P31GbpsB500 TDC 460 Homework 02 5 of 11
WS-1 MAC Ad = A WS-2 MAC Add = C WS-4 MAC Add = F WS-7 MAC Add = I P12 P11 P21 P22 WS-3 MAC Add = B P23 P25 P14 P24 server MAC Add = E SW02 SW01 HUB WS-8 MAC Add = H P13 P15 WS-5 MAC Add = G Router MAC Add = D WS-6 MAC Add = J P26 TDC-460 Winter 2016 SW01 – VLAN 10 : P11, P12, P13, P14, P15 VLAN 20 : P13, P15 SW02 – VLAN 10 : P21, P24, P25 VLAN 20 : P21, P22, P23, P26 a)(4pts) Assume that the MAC forwarding tables are initially empty. For the following sequence of frame transmissions, determine whether the switch receiving the frame floods learns (creates a new entry in the MAC forwarding table) and whether it floods. Sequence step Frame transmission Learn? (YES or NO) Flood? (YES or NO) 1 WS-1 sends a frame to WS-2 Yes Yes 2 WS-2 sends a frame to router Yes Yes 3 WS-1 sends a frame to WS-6 No Yes 4 WS-7 sends a frame to router Yes Yes 5 router sends a frame to WS-4 Yes Yes 6 router sends a frame to WS-7 No No b)(6%) Fill in the MAC forwarding tables for both VLAN10 and VLAN20 for Switch 01 and Switch 02 in the tables provided below after the switches have fully learned the MAC addresses. Switch 01, VLAN10 Switch 01, VLAN20 Port MAC Address Port MAC Address P11 C P11 - P12 A, B P12 - P13 D P13 D P14 E P14 - P15 H, J P15 F, G, I TDC 460 Homework 02 6 of 11
TDC-460 Winter 2016 Switch 02, VLAN10 Switch 02, VLAN20 Port MAC Address Port MAC Address P21 c)(3pts) In the network topology, how many collisions domains,broadcast domains, and subnetsare represented? d.(2%) Identify which links, if any, are VLAN trunksby listing the device -port numberSW01: P13, P15SW02:
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