$\backslash$table$[[,\backslash$table$[[$a$)$ Draw a timing diagram to show CSMA avoidance. $(2$ marks$)],[$b$)$ Why can CSMA$/$CD not be used in wireless networks and why is$],[$CSMA$/$CA a much more effective approach in wireless networks? $(8],[$marks$)]],(10$ marks$)],[$A$17,$Student Answer:,$],[$F$17,$Assessor Feedback:,$\backslash$table$[[($marks$],[$awarded$)]]],[\backslash$table$[[$Q$18]],\backslash$table$[[$a$)$ What is encryption and what does it accomplish? $(2$ marks$)],[$b$)$ How is WPA described in encryption? $(4$ marks$)],[$c$)$ How is WPA$2$ enhanced from WPA? $(4$ marks$)]],(10$ marks$)],[$A$18,$Student Answer:,$],[$F$18,$Assessor Feedback:,$\backslash$table$[[($marks$],[$awarded$)]]],[$Q$19,\backslash$table$[[$a$)$ What is WiFi Roaming and how is it processed?$],[$b$)$ What are the three bridge modes for WiFi APs? Explain any one.$]],(10$ marks$)],[$A$19,$Student Answer:,$],[$F$19,$Assessor Feedback:,$\backslash$table$[[($marks$],[$awarded$)]]],[\backslash$table$[[$Q$20]],\backslash$table$[[$a$)$ Describe HART multi$-$point communication. $(4$ marks$)],[$b$)$ Describe the scope for ISA $100\mathrm{.}11$a and show an implementation example.$],[(6$ marks$)]],(10$ marks$)],[$A$20,$Student Answer:,$],[$F$20,$Assessor Feedback:,$\backslash$table$[[($marks$],[$awarded$)]]]]$