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The instructions and questions for the final year exam of the computer networks unit in the information technology degree offered by the manchester metropolitan university during the academic year 1999/2000. The exam covers various topics related to computer networks, including atm networks, name servers, arpanet, tcp/ip reference model, distributed applications, and fddi. Students are required to answer five questions, each with a specific focus on calculating bit rates, explaining concepts, and comparing technologies.
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S464 02/09/
Examination for the BSc (HONS) INFORMATION TECHNOLOGY FINAL YEAR
Tuesday 23 May 2000
9.30 am to 12.30 pm
Instructions to Candidates
Answer FIVE questions.
Broadcast television signals are to b e sent across an A TM netw ork. A b roadcast television picture com prises 720 pixels x 576 lines w ith a fram e rate of 25 fram es/sec. Calculate th e uncom pressed bit rate for th e digitized signalassum ing th at 12 b its are used to encode each pixel. [3]
A reasonab le approxim ation to th e naturalinform ation b it rate versus tim e ch aracteristic for th e b road b and television signalis sh ow n in Figure Q 1. Find th e burstiness B of th e signaland th e com pression factor, w h ere
compression factor =
uncompressed bit rate average natural information bit rate
Figure Q 1
D iscuss w h eth er th e signalsh ould b e processed prior to transm ission by th e A TM netw ork and outline h ow such processing w ould occur. Select th e m ost approriate A TM service to be used in th is case and justify th e decision. [7]
t
30
20
15
10
5
0
Natural Information Bit Rate
(MBits/s)
Time
NATURAL INFORMATION BIT RATE VERSUS TIME
m _num b e r: string(1..9 ); m _nam e: string(1..80); m _type: string(1..15); m _location: string(1..80); cyc_done: integer; m _status: m ach ine_state; m _part: part; on_h and: integer;
Monitor Process ConceptualSch em a
m _num b e r: string(1..9 ); m _nam e: string(1..80); m _type: string(1..15); m _location: string(1..80); m _cost: float; supplier_nam e: string(1..80); supplier_ph one: string(1..10);
Inventory Process ConceptualSch em a
m _nam e: string(1..80); m _location: string(1..80); last_m aint: string(1..6); next_m aint: string(1..6);
Maintenance Process ConceptualSch em a
Figure Q 4
Explain, w ith reasons, w h eth er or not it is possib le for th e m aintenance process and th e m onitor process to interw ork. [4] Find th e application contexts th at correspond to com m unication b e tw een each of th e processes. [4] Explain th e relationsh ip b e tw een an application entity and an application association. [4] Explain w h at is m eant by th e term A pplication ControlService Elem ent (A CSE) and indicate h ow it is used in application layer com m unications. [4]
Explain h ow FD D I-II provides th e functions w h ich overcom e th e lim itations of th e FD D I standard. [6]
D e d uce th e data rates provided by th e types of service offered by FD D I-II [6]
D e scrib e b riefly h ow a video signalcan b e sent over an FD D I-II netw ork. [4]
D iscuss th e causes of th e im pairm ents sh ow n in Figure Q 6 and explain h ow D MT operates in such situations. [8]
Figure Q 6
Com pare and contrast th e various digitalsub scrib e r line tech nologies. [6]
S464 02/09/
Explain th e operation of th e Go-Back -N error controlsch em e including th e cases of b oth corrupted inform ation and ack now ledgem ent fram es. [7]
D iscuss th e ch aracteristics of each sch em e. [3]
Explain h ow th e Internet Protocolm ay be used to transfer m essages across an Eth ernet localarea netw ork. [8]
D iscuss th e function of th e ‘tim e to live’field in th e IP h eader and its role in th e operation of th e Internet Protocol. [8]
