5. Consider four stations connected to a 100Mbps Bus Local Area Network (LAN). Figure 3 - "Contention-free" Access to a

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5 Consider Four Stations Connected To A 100mbps Bus Local Area Network Lan Figure 3 Contention Free Access To A 1 (85.35 KiB) Viewed 58 times

5. Consider four stations connected to a 100Mbps Bus Local Area Network (LAN). Figure 3 - "Contention-free" Access to a LAN, shows one of the stations experiencing "contention-free access": (i) What does the term "contention-free" mean in practical terms? (5 marks) (ii) Illustrate, using a similar graph, what contention would look like if two stations were contending for access to the same LAN. Highlight on your graph the practical speed of data transfer each station would experience if each station only gained access to the LAN for 50% of the time it required access and explain how this speed is arrived at. (5 marks) (iii) Describe the operation of the CSMA/CD access technique employed on such LANs. In your answer explain if collisions can be avoided altogether. (5 marks) 100 Speed of LAN (Mbps) Station 1: Frame 1 Station 1: Frame 2 Station 1: Frame 3 Station 1: Frame 4 Time (secs) Figure 3 - "Contention-free" Access to a LAN.