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Exercise 9 Answers

Exercise 9 Answers. Question 1 Answers. Any two of: Token circulates ring (1) is picked up by a node wanting to transmit (1) uses STP (1) and RJ45 connectors (1) also uses fibre optic (1) and SC or ST connectors (1) IEEE 802.5 (1) defines standard (1)

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Exercise 9 Answers

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  1. Exercise 9 Answers

  2. Question 1 Answers Any two of: • Token circulates ring (1) is picked up by a node wanting to transmit (1) • uses STP (1) and RJ45 connectors (1) • also uses fibre optic (1) and SC or ST connectors (1) • IEEE 802.5 (1) defines standard (1) • All nodes have equal access (1) one node cannot transmit twice in a row (1) • Token and data circulate ring in one direction only (1) no collisions so fast (1) 1 mark for point and 1 mark for expansion [4]

  3. Question 2 Answers a)Any two of: • speeds from 10Mbps (1) up to 1 Gbps (1) • uses UTP (1) and RJ45 connectors (1) • has used coax (1) and BNC connectors (1) • IEEE 802.3 (1) defines standard (1) • packets have six fields (1) data between 46 and 1500 bytes (1). 1 mark for point and 1 mark for expansion of point [4]

  4. Question 3 Answers Any two of: • IEEE 802.8 (1) defines standard for any network which uses fibre-optic cabling (1) • Standard (IEEE 802.8) covers any type of network (1) e.g. Ethernet or token ring (1) which uses fibre optic cable (1) • FDDI is not covered by any 802 standard (1) but uses fibre optic cable to form a logical ring topology (1) and uses SC or ST connectors (1) • FDDI uses token passing on a logical ring (1) which is made from fibre optic (1) and has speeds up to 100 Mbps (1) 1 mark for point and 1 mark for expansion [4]

  5. Question 4 Answers Any two of: • 802.11 is the standard (1) different letters at the end represent different versions of the standard (1) • Transmission speeds are 11Mbps using 802.11b (1) to 54 Mbps using 802.11g (1) (also accept to 300 Mbps using 802.11n) • WIFI networks allow for consistently changing number of users (1) new device will signal to the network with its address and connection will be established (1) At end of session computers send another signal to indicate that it is leaving the network (1) • Wireless networks use Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) (1) to prevent data colliding in the network (1) • In CSMA/CA sending device sends a “request to send” (1) then waits for a “clear to send” message (1) before it starts sending data (1) • Each computer needs a wireless network card to transmit data / receive data / connect to network (1) wireless access points / routers provide access to other network resources (1) 1 mark for point and 1 mark for expansion [4]

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