NI DUNG N TPMN HC: MNG VIN THNG

Nhm 1: Cc khi nim c bn v mng v dch v mng1. nh ngha mng vin thng? Ly v d v mt mng c th v lit k cc thnh phn trong mng ?

Nm c nh ngha lin quan n 3 yu t: thit b, phng tin v dch v cung cp

Lin h c mt mng c th nh mng in thoi c nh, mng ADSL, mng in thoi di ng t bo, mng Internet,2. Phn loi cc loi mng vin thng: phm vi a l, phng thc chuyn mch, chc nng, vng hot ng?

Nm c phng php phn loi theo cc yu cu trn v k tn c cc loi mng tiu biu

Phm vi a l t mng nh nht n mng hot ng phm vi ln nht

Theo phng thc chuyn mch: cn nm c cc mng tng ng vi cc ch chuyn mch: chuyn mch bn tin, chuyn mch knh, chuyn mch gi, chuyn mch t bo.

Theo chc nng: c th mng truyn ti, mng iu khin, mng qun l.

Theo vng hot ng: mng truy nhp, mng li

3. Phn bit c im hot ng v tnh cht ca cc dch v: thoi, thoi di ng, email, SMS, chat, web browsing

Cn m t c tnh cht c bn nh tnh thi gian thc, hai/mt chiu, di ng hay khng.

Cn m t c tm tt thnh phn tham gia trao i nh ngi yu cu v ngi nhn, server,.4. Nu cc thnh phn cc mng in bo, in thoi, my tnh?

Nm c cc thnh phn c bn ca cc mng in bo, in thoi, my tnh nh truyn dn tng t/s, c cu chuyn mch, dng thng tin trao i (thoi, gi d liu, bn tin), phng php nh tuyn (theo a ch hay khng, c cn bng nh tuyn khng), phng php chuyn tip d liu, phng php thit lp kt ni (c hay khng)

5. Nu v phn bit cc dch v FTTx?

Phn bit cc dch v FTTH, FTTC, FTTN, FTTB v min hot ng in/quang, khong cch cho min tn hiu in.

6. Nu n v o cng lu lng in thoi? Khi nim v ngha ca n v Erlang?

Nm c cng thc cng lu lng theo tc cuc gi ti v thi gian gi my trung bnh.

Nu c ngha ca n v Erlang da trn n v c bn 1 Erlang l cng lu lng lm bn mt knh lin tc.

7. Nu tham s nh gi cht lng dch v trong mng truyn d liu?

Nu c tham s nh gi cht lng nh tr truyn, t l mt d liu, bin ng tr (delay jitter)

Phn tch ngha cc loi tham s ny

8. Ti sao a ch Internet li gm hai phn a ch mng v a ch trm?

Ch n bi ton to thun li cho nh tuyn.

Ly v d minh ha

9. Trnh by khi nim th no l hp ng lu lng, cc tham s nh ngha trong hp ng lu lng, v ngha ca hp ng lu lng trong ATM?10. Th no l mng ISDN? Cu trc v cc giao din trong mng ISDN?

Nu c ngha (nh ngha) ca mng ISDN t tn gi (mng s tch hp a dch v )

Nu c cc giao din BRI v PRI, ch Vit Nam theo h Chu U nn giao din PRI dng mang lung E1 (2,048 Mbps) gm 32 knh 64 kbps: 30 knh B + 1 knh D 64 kbps + 1 knh bo hiu/bo cnh 64kbps11. Nu nhim v v yu cu ca cc giao thc a truy nhp? Phn loi cc giao thc a truy nhp?12. Nu cc thnh phn ca mt mng chuyn mch knh (mng in thoi)? Trnh by s v nguyn l pht trin mng chuyn mch knh da trn chuyn mch v ghp knh?

Nm c cc thnh phn ca mng chuyn mch knh nh ni dung cu 4

Trnh by c nguyn l pht trin mng chuyn mch knh da trn chuyn mch (tng i) v ghp knh, v c cc v d pht trin mng t mng ni ht, mng vng, mng quc gia, quc t. 13. Nu cc dch v mng chuyn mch knh (in thoi) c th cung cp? Mng in thoi c th cung cp dch v truyn d liu c khng? Nu c th tc gii hn bng bao nhiu?

Dch v c bn: thoi

Dch v m rng truyn d liu tc thp. Cn bit vn dng cng thc Shannon v gii hn bng thng ca knh in thoi chng minh tc truyn d liu qua mng in thoi l thp. Nn tm hiu tiu chun V.92 cho tc 56kbps.

14. Nu cc c im ca truyn dn ADSL? Phn bit s khc bit, u nhc im ca truyn dn s dng ADSL v dial-up modem?

Gii thch c ngha ca t ADSL v mch vng thu bao s bt i xng

Trnh by c so snh ADSL vi dial-up MODEM v: phng php kt ni (c s dng chuyn mch khng, c s dng splitter khng), rng bng thng, gii tn cng tc (POTS, ADSL upstream, downstream) , c th s dng hai dch v thoi v d liu ng thi khng? u im v tnh cht thun li trong s dng v tc .15. Trnh by c tnh lu lng in thoi? Cho bit qu trnh ti ca cc cuc gi in thoi c m hnh ha bng phn b g? Vit cng thc phn b v gii thch?Nu v gii thch c tnh cht ngu nhin v xc nh ca lu lng in thoi

Nu c phn b Poisson v vit c cng thc, gii thch c cc bin trong cng thc.16. Nu nhim v ca bi ton nh c mng? Biu din v gii thch mi quan h gia cc tham s s dng trong bi ton nh c mng?

Trnh by c nhim v ca bi ton nh c mng l thit k v ti u mng sao cho cn bng c 3 yu t lu lng, QoS, v ti nguyn mng.Biu din c mi quan h gia 3 yu t thng qua tam gic u, v nu c nhim v xc nh mt tham s khi bit hai tham s cn li.

17. Trnh by tham s QoS trong in thoi, ngha ca hiu sut mng?

Nu c tham s xc sut nghn mch cuc gi Pb v GoS. Vit c cng thc tnh hiu sut, gii thch c cc i lng trong cng thc.Nm c ngha hiu sut t cng thc tnh hiu sut l t l knh chim dng trn tng s knh c trong mng.

18. Ti sao chuyn mch gi c thay chuyn mch bn tin?

Nu c ngha ca chuyn mch gi trong vic gim thi gian tr truyn, gim lng d liu truyn li trong trng hp c li truyn d d liu.

Cn biu din bng hnh v v v d minh ha

19. Phn bit hai ch knh o v datagram ca mng chuyn mch gi? Phn bit ch knh o v knh dnh ring ca mng chuyn mch knh?Phn bit c s khc bit sau: datagram: khng cn thit lp kt ni, cc packet i theo cc ng c lp; knh o: cn thit lp kt ni xc nh ng i ca cc packet, cc packet i theo mt knh c thit lp trong qu trnh thit lp kt ni.

Phn bit c s ging nhau l cc packet cng i theo 1 ng nn cho php gim bin ng tr, nhng khc nhau l knh dnh ring c s dng ring cho mt kt ni cn knh o c chia s bi nhiu kt ni v vy knh o vn c bin ng tr, trong khi knh dnh ring khng c.Nhm cu hi v giao thc mng

1. Da trn nguyn tc truyn d liu trong mng, trnh by u, nhc im ca cc mng chuyn mch bn tin, chuyn mch gi v chuyn mch t bo (ATM) v cc hiu sut s dng, tr truyn dn, bin ng tr v cc loi d liu thch hp?2. Trnh by nguyn l hot ng ca giao thc CSMA/CD, cng thc tnh hiu sut ca giao thc CSMA/CD. Da trn l thuyt hc, gii thch ti sao giao thc CSMA/CD li ch thch hp cho s dng trong mng cc b LAN?3. Trnh by nguyn l hot ng ca giao thc CSMA? Giao thc CSMA c th s dng trong mng WLAN khng? Ti sao? Trong mng WLAN theo chun IEEE. 802.11 cc trm s dng c ch no nhn bit ng truyn bn hay ri?4. Trnh by s cu trc mng bo hiu SS7 v nhim v ca cc thnh phn trong mng?5. Cho bit ti sao cn c lng lu lng gi cao im? Trnh by 2 phng php c lng lu lng gi cao im ADPH v TCBH? So snh u nhc im ca hai phng php ny?6. Qu ti trong mng in thoi xy ra khi no? Ti sao cn phi iu khin qu ti trong mng? Trnh by cc gii php iu khin qu ti c th s dng trong mng in thoi?7. Trnh by nguyn l hot ng ca giao thc Aloha? Tnh thng lng v tr trung bnh ca giao thc Aloha?8. Trnh by nguyn l hot ng ca giao thc S-Aloha? Tnh thng lng v tr trung bnh ca giao thc S-Aloha?9. Trnh by hin tng nt n (Hidden Terminal) trong mng Ad hoc? Mng WLAN khc phc hin tng nt n bng cch no?10. V s cu trc mt mng WLAN c s h tng in hnh s dn DS kt ni 2 BSS, kt ni ti 1 server v kt ni ra mng Internet s dng cc gateway? 11. Trnh by m hnh tham chiu B-ISDN? Nu chc nng ca cc mt phng (plane)? 12. Trnh by s cu trc phn lp ca ATM v nhim v ca cc phn lp AAL v ATM network?13. Trnh by ngha ca cc IFS trong WLAN? Nhim v ca SIFS, PIFS v DIFS?14. Trnh by hai phng php cm nhn song mang trong WLAN? Ti sao WLAN phi s dng ng thi c hai phng php ny?15. Ti sao trong cu trc frame ca WLAN li cn s dng hai trng From DS v To DS? Nu ngha ca ca t hp cc trng hp ca hai trng ny? 16. Trnh by v v minh ha cu trc VP v VC trong si quang? Cho bit s kt ni o c th nh ngha c trong mt ng si quang?17. Nu nhim v ca phn lp AAL trong mng ATM? Trnh by ng dng ca cc loi phn lp AAL khc nhau? Nhm bi tp:

Cc bi tp v nh c mng, tnh hiu sut cc mng v giao thc mng, tm ng ngn nht s dng hai thut ton Bellman-Ford v Dijkstra. Thi gian lm bi 90 pht, khng s dng ti liu.Yu cu: hiu v nm chc cu hi, trnh by cn thn, thi v kim tra tuyt i khng c copy bi ca nhau.