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1 Course name: Network I Exam numer: Midterm II Model Answer Course Code: CNE 304 Exam Date: 21/11/2011 Leturer: Dr. Ahmed ElShafee Time Allowed: 90 minutes Name: ID: *************** write your answer in the right olumn *************** Total /30 1 A swithing devies whose purpose is to provide ommuniation a. terminal. node. onnetor d. station 2 Whih of the following proess are not valid for iruit swithing proess (2) a. iruit disonnet. iruit onnetion. data transfer d. onnetion maintenane e. all estalishment 3 Ciruit swithing almost maintain 100% u liza on of network resoures a. true. false Why? Ciruit swithing links are fully dediated to single onnetion during the whole all, so it an t ahieve 100% u liza on, e 1 / 9

2 4 Ciruit swithing originally developed for oth data & voie transfer etween terminals a. true. false Why your answer? Ciruit swithing originally developed for voie exhanging etween terminals, as links are fully dediated for short period for single all 5 Trunks are multiplexed links that an onnet user terminals to exhanges. a. true. false Why your answer? Trunks are multiplexed links etween exhanges to arry multiple alls etween these swithes. So they an t onnet susriers. The following figure shows three different approahes of swithing 7 Su figure (a) refers to a. frame relay. Asynhronous Transfere Mode. iruit withing d. data grame paket swithing e. Virtual iruit paket swithing 8 Su figure () refers to a. frame relay. Assynronus Transfere Mode. Virtual iruit paket swithing 2 / 9

3 d. data grame paket swithing e. iruit withing 9 Su figure () refers to a. frame relay. Assynronus Transfere Mode. Virtual iruit paket swithing d. iruit withing e. data grame paket swithing 10 Proess (d) alled a. routing preparation proess. path learane proess. all estalishment proess d. end to end path estalishment proess 11 Proess (e) alled a. Sequening. reovery. aknowledgment d. respone 12 Delay (f) alled a. node delay. Tranmission delay. Propagation delay d. transition delay 13 Delay (g) alled a. node delay. transition delay. assemling delay d. transition delay e a 3 / 9

4 The following figure desries the paket sizing effets on overall transmission speed. The message onsists of 30 otets; node adds 4 otets of ontrol information at the eginning of eah paket in the, and data rate 1 otet/us, Ignoring swithing time. 14 In 1 paket message, total transmission me equals to =3x(30+4)=102 use 15 In 2 pakets message, total transmission me equals to =4x(15+4)=76 use / 9

5 16 In 5 pakets message, total transmission me equals to =7x(6+4)=70use 17 In 10 pakets message, total transmission time equals to =12x(3+4)=84 use 18 The optimum paket size is Smallest transmission time = 76 us 19 X.25 protool is not a reliale protool whih was solved in frame relay protool a. true. false Why X.25 is a reliale protool unlike frame relay, as it sends aknowledgement for eah paket sent 20 data link onnetion identifier (DLCI) is to identify a. virtual iruit in virtual iruit paket swithing approah. virtual path in Asynhronous Transfere Mode. logial link in frame relay swithing approah d. virtual hannel in Asynhronous Transfere Mode otet, 5 pakets, 6 data + 4 ontrol 5 / 9

6 21 The following figure shows frame relay protool arhiteture for network terminals. User plane ontains only two layers while ontrol plane ontains 3 layers. d a. paket is fixed size, so no need to implement paket layer in nodes.. data is not transmitted etween nodes as pakets.. data pakets share the same protool (3 rd layer) defined for ontrol pakets. d. sequening is used for ontrol pakets and not used for data pakets. 22 In the following multiple stage swithes, whih of the following onnetion an e estalished (3) a,, e a. 1L 7R. 4L 4R. 7L 6R d. 9L 3R e. 4L 8R 6 / 9

7 23 For the previous multi stage swith, if the intermediate swithes replaed with one 4x4 swith. Numer of simultaneous loking proaility will a. remains the same. half. squared d. douled 24 The most effetive delay in paket swithing tehnique, data gram approah is a. transmission delay. node delay. transition delay Why? Nodes take routing deision per paket 25 The most effetive delay in paket swithing tehnique, virtual iruit approah a. node delay. transition delay. Transmission delay Why? Pakets use the same path during the all, no routing deision in eah node 26 Virtual iruits approahes in paket swithing tehniques overall transmission speed.. transmission speed of iruit swithing tehnique a. equals to. less than. more than d. an t e judged Why? VC divide data into pakets, eah node has to uffer the pakets efore forwarding these pakets to the seond node. 27 TCP layer is reponsile of (3) a. paket data error heking. paket data error reovery. peer hosts onnetivity d. peer appliations onnetivity e. ommuniation session rialaility a a, d, e 7 / 9

8 28 The tranmission delay equals to (2) a. link speed/paket size. link length/wave propagation speed. node uffer length/paket length d. node swithing speed. A, 29 Consider PC1 sending request to paket sent y R2 will ontains a. link layer Soure R Destination R link layer Soure R Destination R link layer Soure R Destination R d. link layer Soure Destination e. link layer Soure Destination / 9

9 30 Consider is replying PC1, paket sent y R2 will ontains a. link layer Soure Destination link layer Soure Destination link layer Soure R Destination R d. link layer Soure R Destination R e. link layer Soure Destination / 9

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