19. For the l AN in Question (18 the Central Node is a Layer 2 switch and the li

Question

19. For the l AN in Question (18 the Central Node is a Layer 2 switch and the links are duplex, what is the maximum throughput of this LAN? a. 30 Mbps 60 Mbps c. 90 Mbps None of the above ue aic sendi an ale 20. Consider the following network LANA Beklge LAN B Statiea 11 Error detection is supported in this network. Station 2 is trying to communicate with Station 20. Assume that we know by the time the signal reaches the bridge some errors have already occurred in the signal Which of ehe foillowing statements is correct a. The bridge detects the errors, notifies Station 2, and discards the corrupted signal b. The bridge detects the errors, notifies Station 2, and relays the corrupted signal as is to Station 20 c The bridge relays the corrupted signal as is to Station 20 d. None of the above OLL

Explanation / Answer

19) Question no 18 is not given. so cant explain

20) correct option is "a"-
the bridges operate on both datalink and physical layer. As physical layer device it regenerate the frame and as datalink layer device it check thephysical( mac) address. if received package is corrupted . it ask the sender to resend the requested package and drop the corrupted package. As channel is noisy and error detection is supported on this channel. the bridge checks the physical address with its table entry. if entry is found it send the package otherwise it asks the sender to resend data and discard the corrupted package.

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