P N NGN HNG THIMN: TNG QUAN VIN THNG

(45 tit 3 tn ch)

CHNG 1: TNG QUAN V VIN THNGCU HI MC 1 (D) 1/ Lch s vin thng c chia thnh bn giai on chnh v lin quan ti cc mng vin thng no di y a Mng in bo - Mng vin thng s - Mng Internet - Mng ISDN b Mng in thoi tng t - Mng vin thng s - Mng s liu - Mng hi t c Mng vi ba s - Mng thng tin v tinh - Mng truyn s liu - Mng in thoi 2/ My in thoi u tin c ra i v pht minh bi a Alexandre Graham Bell - 1876 b Nyquist - 1920 c Shanon - 1948 d Samuel Morse - 1838 3/ Vin thng (telecommunications) l khi nim rng bao gm: a in bo, in thoi, pht thanh truyn hnh, Internet v truyn d liu, fax .. b in thoi c nh, in thoi di ng c in thoi, fax v Internet 4/ Vin thng (telecommunications) l mt thut ng m t vic truyn thng a Qua mi trng cp kim loi b Qua c ly xa v s dng tn hiu mang thng tin c Qua c ly xa d Qua mng Internet 5/ Thng tin (information) c m t l s hiu bit hay tri thc c kh nng biu din di cc dng ph hp cho qu trnh trao i, truyn lan, lu tr v x l, n bao gm cc dng c bn sau a Ting ni, nh tnh, nh ng b m thanh, hnh nh (tnh, ng) v d liu c Ting ni, nh tnh, nh ng d D liu, m thanh 1

6/ Cc hot ng no di y c gi l truyn thng (communications)? a Phng vn trc tip b Gi th c Tt c d Gi in thoi 7/ La chn cc thnh phn c bn trong m hnh h thng truyn thng di y?(a) (b) (c) (d) (e)

M hnh h thng truyn thng (theo 1 chiu ta (a). Ngun tin;(b). B m ha;(c).Knh truyn; (d). B gii m v (e). Nhn tin b (a). B m ha; (b). Ngun tin;(c). Knh truyn; (d). B gii m v (e). Nhn tin c (a). Ngun tin; (b). B gii m; (c). Knh truyn; (d). B m ha v (e). 8/ Knh (communication channel) l khi nim m t mt n v nh nht trong h thng truyn thng c th s dng cho mt dch v vin thng (v d knh thoi, knh s liu ..) a Sai b ng 9/ Cc phng thc truyn thng tin no di y c s dng trc khi cc h thng vin thng hin i ra i? a nh chung b Hiu lnh bng c c Tt c cc phng thc trn d t la 10/ Mc ch chnh ca vic chun ha v cng ngh trong lnh vc vin thng l ? a Nng cao cht lng cc dch v vin thng b Cho php trin khai cc dch v vin thng quc t c Gim gi thnh sn xut cc thit b vin thng d Gip cho cc thit b vin thng ca cc hng khc nhau c kt ni vi nhau mt cch d dng 11/ T chc chun ha quc t no c tn vit tt di y a ra cc khuyn ngh (Recommendations) v vin thng? a IETF b ETSI c IEEE 12/ IETF (Internet Engineering Task Force - i c trch k thut Internet) l t chc quc t m lin quan ti? a Cc tiu chun truy cp Internet tc cao trn ton cu b Cc tiu chun v lnh vc vin thng trn ton cu c Qu trnh khai thc v pht trin cu trc mng Internet 2

d Vic qun l cc nh cung cp dch v Internet trn ton cu (ISP) 13/ C quan no di y ban hnh cc tiu chun trong lnh vc vin thng ti Vit Nam a B thng tin v truyn thng b B khoa hc cng ngh c Tp on Bu chnh Vin thng Vit Nam d Tt c cc c quan trn 14/ Vit Nam chnh thc ha mng Internet quc t vo thi im no? a 11/1997 b 11/1996 c 15/ Mc ch ca m ha ngun (source coding) trong vin thng l : a Gim bt cht lng truyn tin b Biu din ngun tin thnh dy bt m bo ti a dung lng h thng truyn dn c Truyn thng tin i nhanh hn d D dng khi phc thng tin b mt pha thu 16/ Mc ch ca m ha knh (channel coding) trong truyn thng l : a Tng hiu qu s dng knh truyn b Gim bt cht lng truyn tin c C th pht hin v sa li trong qu trnh truyn 17/ Lin minh vin thng quc t (ITU-T), trc y c tn gi khc l? a ITU-R b ETSI c IETF d CCITT 18/ Trong cc h thng truyn thng hin nay, c cc phng thc truyn thng no ang c s dng? a n cng v bn song cng b n cng v song cng c n cng, bn song cng v song cng 19/ Bng tn hin ang s dng cho tn hiu thoi truyn thng l bao nhiu? a 16 Hz - 3400 Hz b 300 Hz 3400 Hz c 300 Hz - 20 CC CU HI MC 2 (TRUNG BNH) 20/ Khi nim m ha ngun (source coding) l qu trnh biu din ngun thng tin: a Thnh chui cc bt nh phn m bo ti a dung lng 3

b Bng cch thm vo cc bt nh phn gim thiu xc sut li khi gii m ti pha thu c Thnh dng ph hp cho truyn dn trong si quang d m bo vic truyn thng tin i nhanh hn 21/ K thut b sung thm cc bt vo cc bn tin truyn i nhm mc ch pht hin v sa li c gi l? a Ghp knh b M ha knh c M ng truyn d M ha 22/ Khi nim iu ch (modulation) l qu trnh bin i? a Thng s ca sng mang theo bin ca tn hiu mang thng tin cn truyn b Tn s ca sng mang theo bin ca tn hiu mang thng tin cn truyn 23/ Xu hng chung pht trin lnh vin thng trong thi gian ti l a Hi t mng c nh v di ng, hi t cc loi thng tin (thoi, d liu v hnh nh) b Pht trin cc mng di ng theo hng bng rng c Pht trin mng vin thng s tch hp a dch v (ISDN) 24/ C quan no di y c chc nng trnh Chnh ph d n lut, php lnh v cc vn bn quy phm php lut khc v Vin thng v Cng ngh thng tin ti Vit Nam? a B khoa hc cng ngh b Vn phng Chnh ph 25/ C quan no di y c thm quyn cp, cho php vic s dng tn s v tuyn in ti Vit Nam? a B Ti nguyn v mi trng b B Cng An c B Quc phng d B thng tin v truyn thng CC CU HI MC 3 (KH) 26/ Tn hiu (signal) l mt khi nim m t dng biu din vt l ca .? a Vin thng (telecommunications) b Thng tin (information) c Ting ni (Voice) d Hnh nh (Picture) 27/ V mt biu din ton hc, tn hiu tng t l tn hiu: a Ri rc theo bin s thi gian v lin tc theo 4

b Lin tc theo bin s thi gian v lin tc theo hm s c Lin tc theo bin s thi gian v ri rc theo hm s 28/ V mt biu din ton hc, tn hiu s l tn hiu: a Ri rc theo bin s thi gian v lin tc theo hm s b Lin tc theo bin s thi gian v lin tc theo hm s

CU HI MC 1 (D)

CHNG 2: DCH V VIN THNG

29/ Theo php lnh Bu chnh Vin thng, dch v vin thng (telecommunications service) c nh ngha l dch v? a Lp t, khai thc v bo dng thit b vin thng b Pht thanh, truyn hnh c Truyn thng tin (k hiu, tn hiu, s liu, ch vit, m thanh, hnh nh) gia cc im kt cui qua mng vin thng d in thoi c nh, di ng v in thoi Internet 30/ Theo quan im ca ngi s dng, dch v vin thng c th phn lo theo cc tiu ch no? a Phm vi cung cp dch v (ni ht, ng di, quc t) b Loi hnh dch v (dch v c bn, dch v gi tr gia tng...) c a im cung cp dch v (ti nh khch hng, ti im giao dch cng cng) 31/ Dch v vin thng c bn l dch v? a Truyn a tc thi thng tin qua mng vin thng m khng lm thay i loi hnh hoc ni dung thng tin. b C gi cc c nh hng thng (khng ph thuc vo lng thng tin v thi gian truyn tin) c c cc nh cung cp dch v cung cp ti cc im giao dch cng cng d Lm tng thm gi tr thng tin ca ngi s dng bng cch ci thin loi hnh 32/ Dch v truyn thng a phng tin l dch v: a Ch truyn d liu b Truyn t nht 2 loi hnh thng tin tr ln c Ch truyn thoi 33/ Khi nim cht lng dch v vin thng (QoS) l? a Xc sut tn tht cuc gi do nng lc mng cung cp b tr lan truyn tn hiu qua cc thit b trn mng vin thng c Tng hp nhng tham s, kin th hin s hi lng, khng hi lng ca khch hng i vi mt dch v vin thng.

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d Khi nim m t nng lc mng li v cc trang thit b cung cp cc dch v vin thng 34/ Hiu nng mng (Network Performance) l khi nim m t: a sn sng ca mng vin thng cung cp cc dch v cho ngi s dng b Nng lc ca mng cung cp kh nng truyn thng tin gia nhng ngi s dng 35/ Khi nim tr (Delay) ni chung l khong thi gian ? a Truyn tn hiu t ngun ti ch b Lu gi tn hiu ti cc nt mng c M ha tn hiu chng li trn ng truyn 36/ Xu hng chung cho vic pht trin dch v vin thng ca cc nh khai thc vin thng trn th gii l? a a dng ha cc loi hnh dch v vin thng b Nng cao cht lng cc dch v vin thng c C 3 p n cn li u ng d Gim gi cc cc dch v vin thng 37/ Ti Vit Nam, rt nhiu cc dch v vin thng (th in t, tin tc, truyn file.) c khai thc ch yu da trn ? a Internet b PLMN 38/ Dch v truy cp Internet no di y ca VNPT ang c s dng rng ri cho truy cp bng rng? a MegaVNN b Internet trc tip c Tt c cc dch v trn d VNN1260, VNN1268, VNN1269 39/ Th in t (e-mail) l mt trong cc dch v gi tr gia tng trn nn mng Internet? a Sai b ng 40/ Ngi s dng dch v vin thng phi thanh ton cc ph cho cc dc v cung cp thng tin no di y: a Hng dn th tc ng k s dng dch v vin thng b Hng dn, t vn s dng dch v vin thng c Gii p thng tin cc ph dch v vin thng d Gii p thng tin kinh t x hi 41/ C th s dng my tnh kt ni Internet v cc thit b h tr khc thc hin cuc m thoi? 6

a b

Sai

42/ Trong cc khi nim v vin thng v cng ngh thng tin, thut ng ISP l cm t ting Anh c vit tt m t: a Nh cung cp dch v Internet b Thit b nghe nhc s c Mt phn mm dit virut 43/ Ti Vit Nam, a ch IP v tn min (domain name) c cung cp chnh thc bi: a Tp on Bu chnh Vin thng (VNPT) b Cng ty FPT c Trung tm Internet Vit Nam (VNNIC) d Cng ty in ton v truyn s liu (VDC) 44/ Dch v gi tr gia tng l loi dch v: a Lin quan ti truyn thoi b Khng cn tnh cc c Thit yu nht m h tng mng c th cung cp 45/ Dch v VoIP c u im g so vi dch v thoi truyn thng? a C chi ph r hn b Cht lng tt hn c Tn nhiu bng thng cho 1 cuc gi d c h tr thm nhiu dch v b sung 46/ Khuyn ngh E800 ca ITU-T th, ...........................c nh ngha l nng lc ca mt mng hoc mt phn mng cung cp cc chc nng c lin quan ti kh nng truyn thng gia nhng ngi s dng a QoS b GoS c MOS d NP CC CU HI MC 2 (TRUNG BNH) 47/ Trong cc cu di y, cu no ng nht? a Hiu nng mng ph thuc vo ngi dng b Nu hiu nng mng (Network Performance) tt th Cht lng dch v (QoS) thp c Hiu nng mng s quyt nh cht lng dch v 48/ Ti Vit Nam, tt c cc nh cung cp dch v chnh l cc nh cung cp mng? a Sai b ng

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49/ Khi nim thng lng (throughput) l tc truyn ti d liu ti a trn ng truyn? a Sai b ng 50/ Dch v thoi qua giao thc Internet (VoIP) em li nhiu u im cho: a C khch hng v nh cung cp dch v b Nh cung cp dch v c Nh cung cp h tng mng d Khch hng 51/ Dch v in thoi c nh v dch v in thoi di ng c cung cp cho khch hng da trn cng mt c s h tng mng in thoi. a ng b 52/ Hin nay ti Vit Nam, dch v truyn s liu ch yu c cung cp cho: a Cc nh cung cp dch v Internet (ISP) b Cc t chc hoc doanh nghip c nhu cu trao i thng tin gia cc chi nhnh c Khch hng c nhn s dng ti nh cho truy cp Internet d Cc trng i hc, vin nghin cu 53/ Dch v in thoi quc t no di y cho php khch hng gim gi cc nhng vn m bo cht lng m thoi? a IDD b Tt c cc dch v trn. c VoIP (171..) d PhoneVNN (in thoi Internet) 54/ Trong s cc dch v trn mng th h sau (NGN) di y ca VNPT, dch v no c cung cp min ph cho ngi gi? a Mng ring o b 1800 c MegaWAN d 1900 55/ Theo khuyn ngh ca ITU-T, cc thnh phn to ln cht lng dch v bao gm: Kh nng h tr dch v, Kh nng khai thc dch v, Kh nng phc v v kh nng ...........? a Khi phc dch v nhanh sau s c b Chm sc khch hng c Cung cp dch v an ton d Cung cp dch v vi gi thnh r nht 56/ Ti Vit Nam ngi s dng dch v vin thng phi thanh ton cc ph cho cc dch v no di y? a 1900 b 114 (cu ho) 8

c 115 (cu thng) d 1800 57/ Trong lnh vc truyn s liu, truy cp bng quay s (Dial-up) l thut ng ch vic: a Kt ni Internet qua ng ADSL b Gi in thoi bng hnh thc quay s c Kt ni internet qua ng in thoi truyn thng d Gi in thoi qua mng Internet

CU HI MC 1 (D) 58/ Khi nim mng vin thng (telecommunications network) l tp hp bao gm: a Cc thit b chuyn mch thc hin kt ni gia cc khch hng b Cc thit b truyn dn truyn ti thng tin trn mng c Cc nt mng (node) v cc ng lin kt (link) gia cc nt mng cung cp cc dch v vin thng d Cc tng di in thoi v thit b truyn dn cung cp dch v 59/ Mng in thoi cng cng chuyn mch knh (PSTN) l mng? a Ch s dng cho truyn thng tin thoi b c xy dng ti u cho truyn d liu tc thp c c xy dng ch yu cho truyn thng tin thoi v c th c s dng truyn d liu tc thp 60/ Trong mng thng tin di ng da trn nn cng ngh GSM, thut ng BTS l cm t vit tt ting Anh ch: a Thit b u cui di ng b Trm thu pht sng v tuyn (trm gc) c Tng i cng v tuyn di ng d Trung tm chuyn 61/ Cc mng truyn s liu tc cao ch yu c xy dng da trn nn cng ngh chuyn mch gi a Sai b ng 62/ Nhc im ln nht ca cu trc mng hnh li (mesh) l kh nng kt ni gia cc nt mng l thp. a Sai b ng 63/ INTRANET l mng my tnh cho php cc my tnh ca cc c nhn, t chc khc cng truy cp trao i thng tin a ng b Sai 9

CHNG 3: CC MNG VIN THNG

64/ Trong lnh vc truyn thng, tp hp cc quy tc m cc im kt cui s dng trao i thng tin c gi l? a Chun (Standard) b Giao din (interface) c Giao thc (protocol) d Chnh sch (policy) 65/ Chng giao thc (protocol stack) l tp hp cc giao thc truyn thng c phn chia theo cc tng thc hin chc nng trao i thng tin qua mng. a 66/ Trong m hnh tham chiu OSI, tng no lm nhim v truyn dn t hiu qua knh truyn thng? a ng dng (Application) b Mng (Network) c Lin kt d liu (Data link) d Vt l (Physical) 67/ Trong m hnh tham chiu OSI, tng lin kt d liu (Data link) lm nhim v? a Truyn cc gi d liu qua mng ti ch b To khung d liu & gi ti knh truyn thng qua tng vt l c To khung d liu & gi ti knh truyn thng qua tng vt l; nhn khung d liu, sa li v chuyn ln tng d Nhn khung d mng 68/ Chng giao thc TCP/IP ch c dng trong cc mng cc b (LAN) hin nay a Sai b ng 69/ Trong chng giao thc TCP/IP, tng giao din mng (network interface) tng ng vi cc tng no trong m hnh tham chiu OSI? a Tng lin kt d liu v tng mng b Tng vt l c Tng lin kt d liu d Tng lin kt d liu v tng vt l 70/ .. l chng giao thc truyn thng c s dng ph bin trong mng Internet. a OSI b IETF c LAN d TCP/IP 71/ Phng thc truyn thng tin qua mng qua 3 giai on: thit lp, duy tr v gii phng kt ni l? a C phng thc chuyn giao hng kt ni v phi kt ni 10

b Phng thc chuyn giao hng kt ni (connection-oriented) c Phng thc chuyn giao kiu gi d Phng thc chuyn giao phi kt ni (connectionless) 72/ Lu lng ch yu trn mng Internet ton cu hin nay l? a Video b VoIP c D liu 73/ Mng Internet cng cng c kh nng truyn cc cuc thoi vi tin cy cao v cht lng tt khi? a Hnh thnh cc tiu chun quc t cho m ha tn hiu thoi tc thp b Ngi dng s dng cc thit b u cui cht lng cao c S dng cc cng ngh bng rng trn mng ng trc v mng truy nhp 74/ Mng ring o (VPN) l khi nim m t? a Mt giao thc mng tc cao b Mng s dng cng ngh chuyn tip khung (Frame-Relay) c Mt tiu chun mt m d liu m bo truyn dn an ton qua mng 75/ Gii php truy cp Internet bng k thut quay s (dial-up) hin nay ang c dng rt ph bin ti Vit Nam a Sai b ng 76/ Hai cng ngh ang c s dng trn cc mng in thoi di ng Vit Nam l? a GSM, GPRS b FDM, DWDM c GPRS, CDMA d GSM, 77/ S khc bit chnh gia mng cc b (LAN) v mng din rng (WAN) l? a Tc truyn d liu b Kh nng bo mt thng tin c Cht lng truyn d liu 78/ S pht trin ca cng ngh .l ng lc cho s bng n mng bng rng. a ISDN b Truyn dn quang c TDM d Ethernet 79/ S hi t v cng ngh vin thng dn ti nhu cu v ... 11

a Mng khng dy b Bng thng ln c Nn lu lng qua mng quang d m bo an ninh 80/ c im no di y khng l u im ca cc mng bng rng a Ph hp vi lu lng thi gian thc b Chi ph thp c Dung lng ln, tc cao d Thi gian tr nh 81/ Mng th MAN, c vit tt bi cm t : a Medium Area Network b Medium Access Network c Metropolitan Area Network d Metropolitan Access Network 82/ Cu hnh mng no di y c cc nt cng c ni vo mt nt trung gian trn mng a Hnh sao (Star) b Tt c cc cu hnh trn c Hnh li (Mesh) 83/ Trong k thut phn tng, khi thay th cc giao thc s dng trong m tng th? a nh hng ti ton b h thng b Khng th thay th c c C nh hng n cc tng khc 84/ Trong m hnh OSI, tng 3 c tn l g? a ng dng (Application) b Vt l (Physical) c Lin kt d liu (Data link) d Mng (network) CC CU HI MC 2 (TRUNG BNH) 85/ Mi mng vin thng c xy dng thc hin truyn ti 1 trong cc loi hnh thng tin (thoi, d liu hoc hnh nh)? a ng b 86/ Cc doanh nghip ln hin nay ang c mt nhu cu lin quan ti kt ni mng my tnh l? a S dng cc my tnh vi tc x l cao b Gii php truyn d liu tc cao qua mng trn phm vi rng ln c Gim cng sut tiu th in ca thit b 12

87/ S khc bit chnh gia mng thng tin di ng cng cng (PLMN) v mng in thoi cng cng chuyn mch knh (PSTN) l? a Phng php truy nhp vo mng ca cc thit b u cui ca khch hng b Mng thng tin di ng cng cng (PLMN) qun l c s d liu khch hng tp trung c Mng in thoi cng cng chuyn mch knh (PSTN) l mng c xy dng cho truyn thng tin thoi. d Mng thng tin di ng cng cng (PLMN) ch c xy dng trn nn 88/ Mc ch chnh ca vic kt ni cc my tnh thnh mng l? a cc my tnh c hot ng an ton hn b Gip ngi dng trong vic lu tr d liu hiu qu hn c Chia s ngun ti nguyn chung gia cc my 89/ Loi mng no di y ang c ng dng rng ri ti pha khch hng? a LAN b MAN c WAN 90/ Mng Internet l khi nim m t? a Mng vin thng c pht trin ch yu cho dch v thoi v truyn hnh b Chui cc mng my tnh trn ton cu c kt ni vi nhau s dng chng giao thc TCP/IP c Mng cung cp dch v th in t, truyn file. d Mng kt ni cc my tnh trn ton cu c kt ni vi nhau s 91/ Xu hng pht trin mng vin thng trong thi gian ti l? a Xy dng cc mng vin thng cung cp cc dch v c cht lng cao b Hi t cc loi hnh mng (c nh v di ng) v cc loi hnh thng tin (thoi, d liu, hnh nh) c C 3 p n cn li u ng 92/ Lp mng no di y lin quan ch yu ti vic qun l cc thit b ca ngi s dng khi tham gia vo mng s dng dch v? a C lp li v lp bin b Lp mng bin (edge) c Lp truy nhp (Access) d Lp mng li (Core) 93/ Ti sao cn xy dng mng vin thng theo quan im phn tng (layering)? a C 3 p n cn li u ng b C th chun ha cc chc nng ca cc thit b

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c gim phc tp trong qu trnh thit k cc h thng v ch to cc thit b trn mng d Gip cho vic pht trin, nng cp mng c thun li hn 94/ Phng thc chuyn giao thng tin qua mng chuyn mch knh thch hp cho? a Truyn hnh nh b Truyn tt c cc loi thng tin (thoi, d liu v hnh nh) qua mng c Truyn d liu qua mng 95/ Mng Internet c ra i v ch thc s pht trin khi mng thng tin di ng ton cu (GSM) xut hin a Sai b ng 96/ Trong mng thng tin di ng da trn nn cng ngh GSM, nt mng l thit b c tn vit tt no di y? a MS b BTS c BSC d MSC 97/ Trong mng in thoi cng cng, mi thit b u cui ca khch hng u c kt ni trc tip ti cc tng i in thoi trn mng? a ng b 98/ Trong mng my tnh s dng chng giao thc TCP/IP, mi a ch IP c dng gn cho? a Mt b nh tuyn (Router) b Mt mng con c Mt my trm (Host) d Mt giao din mng 99/ .l cng ngh truy nhp hu tuyn, bng thng rng v ang c s dng rng ri trn mng vin thng Vit Nam a ADSL b GPRS c ISDN d FTTH 100/ Cng ngh truy nhp no di y khng phi l truy nhp bng rng? a EPON b N-ISDN c FTTH d ADSL CC CU HI MC 3 (KH) 101/ Nt mng (node) trn mng my tnh ton cu (Internet) l thit b no di y? 14

a B nh tuyn (Router) b My ch (Server) c My ch (Server) v my tnh kt ni vo internet d My tnh kt ni vo Internet 102/ Giao thc no di y c s dng trong tng lin mng (internetwork) trong mng da trn chng giao thc TCP/IP? a OSPF, BGP b Tt c cc giao thc k trn c ARP d IP, ICMP 103/ thc hin vic truyn tp d liu qua mng my tnh thnh cng cn s dng cc giao thc truyn thng ti cc tng no di y theo chng giao thc TCP/IP? a Cc giao thc ti tng giao vn b Cc giao thc ti tng ng dng c Cc giao thc truyn thng ti c 4 tng

CHNG 4: CC VN V TRUYN DN V GHP KNHCU HI MC 1 (D) 104/ Trong truyn dn tng t, khi ni n bng thng (Bandwidth) c ngha l: a rng ca mt di tn s m cc tn hiu s dng b Tn s cao nht ca knh truyn dn c Tc hay dung lng truyn dn ti a m knh truyn dn c kh nng truyn ti d Tn s hot ng ca knh truyn dn 105/ Trong truyn dn s, khi ni n bng thng (Bandwidth) c ngha l: a Tn s hot ng ca knh truyn dn b Tc ti a hay dung lng truyn dn m thit b c kh nng truyn ti c Tn s cao nht ca knh truyn dn d rng ca mt di tn s m cc tnh hiu chim dng trn mt 106/ Mt h thng truyn dn (Transmission system) ni chung gm cc thnh ti thiu sau: a Thit b pht, thit b thu v b m ha b Thit b pht, mi trng truyn dn v thit b thu c Thit b pht, trm khuych i v mi trng truyn dn d Mi trng truyn dn, trm lp v thit b thu 107/ Cc mi trng truyn dn c th c dng truyn dn tn hiu qua mng vin thng? a Cp ng trc, Si quang v Si cp ng b Si cp ng v mi trng v tuyn 15

c Si quang v Cp ng trc d C 3 p n cn li u 108/ .l mi trng truyn dn c nhiu u im nht v dung lng, cht lng v gi thnh trn knh? a Cp si quang (Optical fiber cable) b Cp ng xon i (Twisted pair cable) c Cp ng trc (Coaxial cable) d Mi trng v tuyn (Wireless) 109/ Trn mng vin thng hin nay cp xon i c dng ch yu truyn dn tn hiu trn mng ng trc c dung lng ln. a ng b Sai 110/ Cc u im chnh ca h thng truyn dn v tuyn l? a Khng cn dy dn, lp t h thng nhanh v chi ph thp b Chi ph thp v t nh hng bi can nhiu c Lp t h thng nhanh v t nh hng bi thi 111/ H thng truyn dn no c s dng tt nht trong trng hp pht qung b ti cc vng su, vng xa? a Cp si quang b Cp ng trc c Vi ba s 112/ Mt trong cc nhc im ca thng tin v tinh l khong thi gian tr truyn dn ln v? a Cng sut pht tn hiu nh b Dung lng truyn dn ln c Suy hao trn ng truyn ln d C ly truyn dn 113/ Ti sao cn s dng k thut khuych i tn hiu trn ng truyn? a b li cc suy hao tn hiu khi lan truyn qua cc mi trng truyn dn b tng tc lan truyn tn hiu trong cc mi trng truyn dn c gim can nhiu trong tn hiu sau khi lan truyn qua cc mi trng truyn dn 114/ Mc ch ca vic ghp knh (Multiplexing) l : a Pht hin v sa li truyn dn b Gim can nhiu trn ng truyn c Tng hiu qu s dng ng truyn (dung lng truyn dn) 115/ Truyn dn song cng (Full duplex transmission) l khi nim m t kh nng truyn tn hiu: 16

a Ch theo mt hng b ng thi trn hai hng c Vi dung lng gp 2 ln so vi thng thng d Trn hai hng nhng khng ng thi 116/ Tn hiu tng t c th c bng cch kt hp chng vi mt sng mang ph hp vi mi trng truyn dn. a Ghp knh b Trn c Tch knh d Truyn dn qua mng 117/ .... l k thut iu ch bin ca sng mang theo dng sng ca tn hiu iu ch. a AM (Amplitude Modulation) b PSK(Phase Shift Keying) c PM (Phase Modulation) d FM (Frequency Modulation) 118/ lin lc gia cc xe taxi v trung tm iu hnh xe taxi, hin nay cc hng taxi thng s dng phng thc lin lc: a Bn song cng b Song cng c Tt c cc p p u ng d n cng 119/ Truyn dn quang l phng thc truyn dn tt nht vi u im sau: Dung lng ln, c ly di v ........................... a Khc phc li nhanh b Gi thnh thit b thp c Cht lng 120/ Vt liu thng c s dng lm dy dn trong cp ng xon i: a Vt liu c bit khc b c ng Thu tinh (Cu) d Nhm 121/ Mt trong cc nhn t quan trng hn ch vic s dng truyn dn v tuyn l? a di tuyn cp b Phn b ti nguyn tn s c Gi thnh cp d H thng phc tp 122/ b li suy hao trn ng truyn dn, cn s dng? a B pht tn hiu b B khuych i 17

d B ghp knh 123/ Xuyn m v cc loi can nhiu khc nh hng ti h thng truyn dn nh no? a Gim cht lng truyn dn b Khng nh hng ti cht lng truyn dn c Ci thin cht lng truyn dn d C gim cht lng truyn dn nhng rt nh c th b qua khng ph thuc vo khong cch 124/ Cp ng trc c cu trc nh no? a Gm 2 cp dy dn xon vo nhau b Gm mt dy dn kim loi v khng c v c Gm li kim loi gia v lp dn in khc bao ph bn ngoi d Gm mt cp dy dn xon vo nhau 125/ Trong cc h thng truyn dn, mc suy hao nhiu nht ph thuc vo? a Cng sut my thu b Cng sut my pht c Loi tn hiu lan CC CU HI MC 2 (TRUNG BNH) 126/ Loi si quang ang c s dng ph bin hin nay trn mng truyn dn l si n mt (SM)? a 127/ Khi nim sng mang (carrier wave) l sng in t c dng mang thng tin ca ngi dng qua mng v thng c tn s cao hn tn s ca tn hiu gc mang tin tc. a 128/ Trong lnh vc truyn dn, iu ch (modulation) l qu trnh bin i? a Cc thng s ca sng mang theo tn s ca tn hiu gc mang thng tin b Tn s ca sng mang theo dng sng ca tn hiu gc mang thng tin 129/ Trong truyn dn s, m ng truyn (line code) l cc loi m c dng : a Gip cho vic pht hin, sa li v tng hiu qu s dng knh truyn b Tng hiu qu s dng knh truyn c m bo vic truyn dn tn hiu s khng b li qua mng d Biu din tn hiu trn ng truyn m bo pha thu c th 130/ Trn mng vin thng Vit nam, k thut ghp knh theo bc sng (WDM) c s dng trn cc mng truyn dn quang ng trc. a Sai

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b 131/ Si quang n mt (SM) l loi si quang u tin c thng mi ha v s dng trong cc h thng thng tin quang? a ng b 132/ n v o suy hao ca tn hiu khi truyn qua cc mi trng truyn dn l? a mW (milli watt) b Hz (Hetz) c dB (Decibel) d ms (milli second) 133/ Mt s u im chnh ca truyn dn s so vi truyn dn tng t l: dung lng ln, c ly truyn dn di v .? a C s dng cp kim loi b Cht lng tt c C s dng b khuych i d Gi thnh r 134/ Lung truyn dn s c s trong h thng truyn dn (E1) c tc bt l? a 2 Mbit/s b 64 Kbit/s 135/ Thut ng PCM c vit tt bi cm t no sau y? a Pulse Canceller Modulation b Pulse Code Modulation c Pulse Code 136/ Mi trng truyn dn no c dng ph bin trong cc mng cc b (LAN)? a Cp xon i b V tuyn c Si quang 137/ Mi trng truyn dn no di y s dng trong h thng ghp knh theo bc sng (WDM)? a V tuyn b Cp ng trc c Cp si quang 138/ Vt liu ch yu ch to si quang trong thng tin vin thng l: a Cht do (polyme) b Thu tinh (SiO ) c Nhm 19

d ng (Cu) 139/ Trong thng tin thoi, rng bng tn (Bandwidth) ca tn hiu thoi c s dng l 3.1kHz (0.3-3.4) l ? a Gim can nhiu trn ng truyn b Hiu qu s dng knh truyn l tt nht c m bo hiu qu s dng knh truyn v cht lng m thoi 140/ Trong h thng thng tin quang, linh kin c dng ch yu pht ra nh sng a vo si quang ang c s dng hin nay l? a LASER b APD c LED d PIN CC CU HI MC 3 (KH) 141/ i vi cp kim loi s dng trn mng vin thng, tham s ng knh li si s quyt nh C ly truyn dn ti a? a Sai b ng 142/ Si quang c phn chia thnh 3 loi chnh: si a mt chit sut bc (SI-MM), si a mt chit sut bin thin (GI-MM) v si n mt (SM) theo cc yu t no di y: a Kch thc ca li si quang b Tt c cc yu t c Phn b chit sut trong li si quang d c tnh lan truyn ca sng nh sng qua li si 143/ Trong phng php ghp knh phn chia theo thi gian (TDM), tc ghp ti a ca cc thit b c thng mi l? a 1Gb/s b 565 Mb/s c 2.5Gb/s d 10Gb/s 144/ Hin nay nng cao dung lng truyn dn, cc h thng thng p dng c 2 phng php: ghp knh theo thi gian (TDM) v ghp knh theo bc sng (WDM). a Sai b ng 145/ K thut ghp knh theo thi gian (TDM) c s dng ph bin ghp? a Tn hiu s b Tn hiu tng t c Tn hiu s v tn hiu tng t d Tn hiu quang 20

146/ Di tn s s dng ca knh truyn dn cng rng th ............... a Dung lng truyn dn cng nh b Dung lng truyn dn cng ln c Cht lng truyn dn cng km d Dung lng truyn

CHNG 5:CC VN V CHUYN MCH V NH TUYCU HI MC 1 (D) 147/ Trong lnh vc vin thng, chuyn mch l mt khi nim m t: a Chuyn i dng tn hiu ph hp vi ng truyn trn mng b Qu trnh thit lp mt tuyn ni t mt u vo ti u ra ti nt mng thc hin cuc trao i thng tin. c Qu trnh truyn thng tin gia 2 im trn mng thc hin cuc trao i thng tin d Vic trao i cc thng tin iu khin kt ni cho cuc trao i thng tin qua mng 148/ Hai phng thc chuyn mch c bn ti cc nt mng l? a Chuyn mch in thoi c nh v chuyn mch in thoi di ng b Chuyn mch t bo v chuyn mch gi c Chuyn mch knh & chuyn mch gi 149/ Cc nt mng trong mng chuyn tip khung (Frame Relay) s dng phng thc chuyn mch knh? a Sai b ng 150/ Chuyn mch knh l khi nim m t qu trnh trao i thng tin gia cc: a Lung tn hiu ti u vo v u ra ca nt chuyn mch b Knh c tc khc nhau c Khe thi gian trn cc lung tn hiu cng th t ti u vo v u ra ca nt chuyn mch d Khe thi gian trn cc lung tn hiu ti u vo v u ra ca nt chuyn mch 151/ K thut chuyn mch knh thng c s dng cho qu trnh trao i thng tin: a Thoi, d liu b D liu c a phng tin 152/ Mng no di y s dng cng ngh chuyn mch knh? a Internet 21

b PSTN c X.25 d Frame Relay 153/ u im ca chuyn mch knh l? a Chi ph khng ph thuc vo khong cch b Nng cao hiu qu s dng ng truyn 154/ Tng chuyn mch khng gian trao i thng tin gia hai khe thi gian cng ch s ca bt k lung tn hiu u vo v bt k lung tn hiu u ra ca trng chuyn mch. a 155/ Tng chuyn mch thi gian trao i thng tin gia hai khe thi gian: a Cng ch s trn cc lung tn hiu u vo v u ra ca trng chuyn mch b Trn cc lung tn hiu u vo v u ra bt k ca trng chuyn mch c C ch s khc nhau trn cc lung tn hiu u vo v u ra cng ch s ca trng chuyn mch d Cng ch s trn cc lung tn hiu u vo v u ra cng ch s ca 156/ Chuyn mch gi c s dng ch yu trong? a Mng truyn s liu X.25 b C 3 p n cn li u ng c Mng Internet d Mng bo hiu knh chung s 7 157/ Trong cu trc ca gi tin (packet), trng tiu (header) thng c dng mang thng tin v a ch ngun, a ch ch ca gi tin? a Sai b ng 158/ nh tuyn trong mng chuyn mch gi l khi nim m t qu trnh thc hin ti nt mng bao gm: a Xc nh ng i qua nt mng b Chuyn tip thng tin qua nt mng c Xc nh ng i ti u v chuyn thng tin qua cc giao din 159/ Theo m hnh tham chiu OSI, chc nng nh tuyn c thc hin t lp no? a Lp 1 (lp vt l) b Lp 7 (lp ng dng) c Lp 3 (lp mng) d Lp 2 (lp lin kt d liu) 160/ Trong trng chuyn mch knh khng gian s (S), nu khe thi gian u vo l TS#4 th khe thi gian u ra c ch s l? 22

a TS#0 b TS#4 c Khe thi gian bt k khc d TS#16 161/ Trong trng chuyn mch knh khng gian s (S), mi mt cuc thng tin ch c thc hin trn mt khung PCM duy nht? a ng b 162/ Trong chuyn mch gi, cc gi tin thng i t ngun ti ch theo..qua mng: a C 3 p n cn li u ng b Nhiu ng khc nhau c Mt ng duy nht CC CU HI MC 2 (TRUNG BNH) 163/ Trong mng in thoi s dng chuyn mch knh, cc knh s b chim dng: a Ch khi c 1 trong 2 thu bao m thoi b Cho ti khi c hai thu bao t my dng m thoi c K t khi thu bao ch gi bt u quay s d Trong sut thi gian din ra cuc gi ca cc thu bao 164/ Trn trng chuyn mch thi gian, nu khe thi gian u vo l 5 (TS#5) v khe thi gian u ra s 9 (TS#9) th thi gian tr ca tn hiu l bao nhiu? a 32TS b 165/ Nu mt nt chuyn mch ch s dng mt trng chuyn mch thi gian hoc trng chuyn mch khng gian th s xy ra tn tht. a Sai b ng 166/ Ti nt mng chuyn mch gi , gi tin s c lu tr tm thi v c chuyn tip ti cc u ra (Store and forward) a Khng gy ra hin tng bin ng thi gian tr ca cc gi tin b Cc gi tin c thi gian tr ln ti nt mng c Cc gi tin c thi gian tr nh ti nt mng 167/ Cc gi (packet) mang thng tin ca 1 ngi s dng s c truyn theo cng mt ng i qua mng chuyn mch gi? a

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168/ So vi mng chuyn mch knh, mng chuyn mch gi c hiu qu s dng knh truyn? a Cao hn b Ngang bng c Thp hn 169/ Vi cng ngh chuyn mch gi, mng Internet gim xc sut mt gi tin trong cc cuc thoi qua Internet? a 170/ Trong cc mng ln (nhiu nt mng), m bo hiu qu trong vic trao i thng tin nh tuyn, ngi ta thng s dng kiu nh tuyn phn cp? a Sai b ng 171/ tng dung lng chuyn mch, phng n xy dng trng chuyn mch no di y thng c s dng? a T-S-T b T-S c S-T-S d S-T CC CU HI MC 3 (KH) 172/ Cc mng chuyn mch gi no di y s dng chuyn giao hng kt ni (connection-oriented) a ATM, X.25 v Frame Relay b TDM c IP d Ethernet 173/ Nhc im ca nh tuyn tnh so vi nh tuyn ng l? a Khng c c ch khi phc li cc tuyn b li b S dng nhiu ti nguyn mng trong qu trnh tm ng i cho gi tin c Tt c cc thng tin nh tuyn c truyn trn cc bn tin cp 174/ B nh tuyn (Router) hot ng tng no theo m hnh tham chiu OSI? a Tng 3 b Tng 1 c T tng 1 ti tng 7 d T tng 1 ti tng 3

CHNG 6: BO HIU V NG B TRONG MNG VIN THNG24

CU HI MC 1 (D) 175/ Trong mng in thoi, bo hiu l khi nim m t qu trnh trao thng tin iu khin lin quan ti? a Thit lp cuc gi b Gii phng cuc gi c Tt c cc giai on thit lp, duy tr v gii phng cuc gi d Duy tr cuc gi 176/ H thng bo hiu trong mng in thoi thc hin 3 chc nng chnh, l: a Gim st, pht hin thu bao nhc my v khai thc mng b Tm chn, chuyn a ch v khai thc mng c Gim st, tm chn v khai thc mng d Gim st, tm chn v gii phng cuc gi 177/ Trong mng chuyn mch knh, bo hiu ng dy thu bao l qu trnh trao i thng tin bo hiu gia? a Thit b u cui v tng i ni ht b Cc tng i ni ht c Tng i ni ht v tng i chuyn tip d Gia cc thit b u cui ca khch hng 178/ Thng tin bo hiu a ch trn mng chuyn mch gi thng c truyn trn mng cng vi ni dung thng tin cn trao i. a Sai b ng 179/ Trong h thng bo hiu knh chung s 7 (CCS 7), ton b cc thng tin bo hiu ca cc cuc gi gia hai nt mng u c truyn trn mt knh dnh ring a 180/ Bo hiu .. l bo hiu gia thu bao v tng i ni ht trn mng in thoi a CSS-7 b R2-MFC c Lin i d Thu 181/ Bo hiu .. l bo hiu gia cc tng i in t s trn mng in thoi. a Lin i b Thu bao c DSS-1 182/ ng b mng l khi nim m t vic m bo cc thit b trn mng: a Phi hp lm vic vi nhau cung cp dch v vi cht lng tt nht 25

c Lm vic vi cng mt ngun ng h chung d ng b vi nhau v chng loi thit b 183/ Ti sao cn thc hin ng b mng? a Phi hp trao i thng tin bo hiu b gim gi thnh u t mng li c Gim can nhiu trn ng truyn d m bo s n nh v cht lng dch v do 184/ ng b ch t (Master - Slave) l phng php? a Ty thuc vo v tr trn mng m cc ngun ng h c th va tham chiu ln nhau, va hot ng c lp. b Cc ngun ng h ti cc nt mng lm vic c lp vi nhau c Mt ngun ng h c chnh xc cao lm ng h ch, cc ngun ng h khc hot ng tham chiu theo ngun ng h ch . d Tt c cc ngun ng h trn mng hot ng u tham chiu ln 185/ m bo mng lm vic ng b vi nhau, phng php ng b no c chi ph u t cao nht? a ng b hn hp b ng b ch t c ng b c lp 186/ Trong nhng trng hp no th thu bao in thoi nhn tn hiu bo bn? a Knh trung k gia cc tng i tc nghn b Thu bao b gi ang m thoi c Thu bao b gi t knh my 187/ Trong h thng bo hiu knh ring R2-MFC, tn hiu bo hiu m t trng thi ng trung k c truyn trn khe thi gian no ca khung PCM 30/32? a TS#1 b 188/ Trong phng php ng b mng kiu cn ng b, th . a Mt ng h ch c chnh xc cao s iu khin cc ng h trn mng b Cc ng h ti cc nt mng c lp vi nhau c Cc thnh phn trn mng khng cn ng b vi nhau CC CU HI MC 2 (TRUNG BNH) 189/ Ti sao cn c cc k hoch bo hiu, ng b, nh s v tnh cc trong mng vin thng? a phi hp lm vic gia cc tng i trn mng in thoi b phi hp lm vic gia nt mng v cc ng truyn dn c m bo cung cp dch v vi cht lng tt hn 26

d thc hin phi hp lm vic gia cc phn t trn mng vin thng cung cp cc dch v 190/ i vi cc cuc gi lin i, cc knh ch c gii phng hon ton khi? a Thu bao ch gi t my b C thu bao ch gi v b gi t my c Mt trong hai thu bao ch gi hoc b gi t my d C hai thu bao khng m thoi 191/ Cc u im ca h thng bo hiu knh chung so vi bo hiu knh ring l? a Phm vi ng dng rng ri b Bao gm c 3 p n cn li c Hiu qu s dng knh bo hiu cao d H tr nhiu dch v b 192/ ng dng ca cc h thng bo hiu lin i trn mng vin thng Vit Nam hin nay? a a phn l bo hiu knh ring, mt s t s dng bo hiu knh chung b Ch s dng bo hiu knh chung c Ch s dng bo hiu knh ring 193/ Mng ng b ti Vit Nam (do VNPT qun l) c xy dng da trn phng php ng b no? a Ch t b Tng h c Ch t (c d phng) d c lp 194/ Trong phng php ng b ch t, nht thit phi xy dng mt mng truyn ti tn hiu t ng h ch ti cc ng h t? a Sai b ng 195/ Trong cc phng php ng b mng di y, phng php no phc tp nht trong qu trnh xy dng mng ng b? a ng b ch t b ng b c lp c ng b tng h d ng b hn hp 196/ Trong mng ng b, mt trong cc thng s c dng nh gi cht lng ca ng h l? a chnh xc b Gi thnh c sn sng 197/ Trong h thng bo hiu R2-MFC: a Gim st, tm chn v gii phng cuc gi 27

b Cc thng tin bo hiu (cc con s a ch) ca cc cuc thoi khc nhau c truyn trn cc knh ring bit. c Gim st, pht hin thu bao nhc my v khai thc mng d Tt c cc thng tin bo hiu ca cc cuc thoi khc nhau c truyn trn 1

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