1. u l li ch ca phn tng trong h thng mng truyn thng:

a. Cho php s dng cc giao thc.

b. Dch v do thc th ny cung cp hon ton da trn dch v do thc th ng trc trong chui (tng thp hn) cung cp.

c. Cho php xc nh c th quan h gia cc thnh phn trong h thng

2. M hnh TCP/IP v m hnh OSI c cc c tnh:

a. Cng c ci t trn cc mng truyn thng

b. Ch TCP/IP mi c ci t trn cc mng truyn thng cn OSI l m hnh nghin cu l thuytc. C hai u c s lng giao thc s dng nh nhau

d. Ba tng trn cng ca OSI (Application, Presentation, Session) c ghp li lm mt trong m hnh TCP/IP

3. Mt webclient h tr giao thc HTTP version 1.1 kt ni n hai webserver khc ln lt h tr giao thc HTTP 1.0 v 1.1 ly t cc webserver v 3 file nh GIF (t server h tr 1.0) v 5 file nh JPG (t server h tr 1.1). Tng s kt ni m webclient ny phi s dng ti thiu l bao nhiu:

a. 2b. 3c. 4d. 54. Root name server h tr cc loi truy vn no:a. Truy vn tng tcb. Truy vn quyc. C hai loi trnd. Ty tng trng hp m client s dng5. Trong giao thc Go-Back-N, A gi cc packet c STT 0,1,2,3,4 n B. Gi 2, 3 n B b li 1 ln. Tnh c cc gi ACK, c A v B phi gi bao nhiu gi cho n khi B nhn bit ca s gi c kch thc l 3:14

6. Trong giao thc Selective Repeat, A gi cc packet c STT 0,1,2,3,4 n B. Gi 2, 3 n B b li 1 ln. Tnh c cc gi ACK, c A v B phi gi bao nhiu gi cho n khi B nhn bit ca s gi c kch thc l 3:12

7. Trong cc ng dng sau, ng dng no cn t nht 2 trong 3 yu cu c bn m dch v giao vn cn cung cp cho cc ng dng:

a. Webb. Emailc. Game onlined. File sharing8. Tng giao vn ti my tnh A cn gi 212 segment cho my tnh B thng qua giao thc TCP. Bit cc segment c hng n v l 4 v d: 4, 14, 24 u b li ln u trong qu trnh gi, ngoi ra cc thng tin khc trong ton b qu trnh truyn thng l hon ho. Hy tnh s lng cc ACK bn B gi li cho bn A.

9. c bit ngng (threshold) ca qu trnh kim sot tc nghn l 48, hy xc nh gi tr ca ca s chng tc nghn (congwin) khi gi 128 segment v nhn s ACK tr v.

10. Tnh UDP checksum 16 bit ca on text: DHQGHN. Sau vit li di dng s thp phn hoc nh phn. Bit A c m l 6511. Cho bit my tnh A c IP l 152.15.90.58/29. C th chia mng cha A thnh bao nhiu mng con, hy lit k tt c cc mng con c th chia:12. My tnh A gi 9000 byte data t tng network ca mnh n tng network ti my tnh B. Bit rng trn ng i cc gi d liu phi i qua cc chng c MTU ln lt l 1500, 1200; tiu ca cc datagram khng c phn ph, hay cho bit bn B nhn c bao nhiu datagram v datagram th 8 cha bao nhiu byte d liu:

13. S sau biu din cc con ng c th i gia cc router A, B, C, D, E, F v gi tr phi tr cho mi tuyn. Hy xc nh ng i c gi tr b nht t A n F thng qua gii thut Dijsktra14. S sau biu din cc con ng c th i gia cc router A, B, C, D, E, F v gi tr phi tr cho mi tuyn. Hy xc nh bng Distance Vector i t A n cc nt cn li.15. Mt webclient cn ly file nh c a ch http://www.pictures.net/funny/mydarling.jpg gi s webclient to xong kt ni TCP ti server. Hy vit thng ip yu cu ti thiu m webclient cn gi cho server:

16. Trong bng nh tuyn ca router A c cc dng nh sau:

a. Destination 203.113.0.0/16 ( Gateway 113.16.8.1b. Destination 203.113.128.0/17 ( Gateway 113.16.9.1c. Destination 203.113.64.0/18 ( Gateway 113.16.10.1d. Destination 203.113.192.0/18 ( Gateway 113.16.11.1Hy cho bit khi A nhn gi tin c a ch ch l 203.113.224.1 th dng no s c la chn

17. Bit n v d liu sau khi thm bit kim tra l 8 bye. Hy xc nh ma trn kim tra chn l hai chiu cho on k t sau: fedcba bit m ca k t a l 9718. Xc nh m Hamming cho k t i bit m ca k t a l 9719. M Hamming ca mt k t m bn nhn nhn c l: 1 0 1 0 1 1 1 0 1 1 0. Bit on m ny b li ti mt bit. Hy sa li v xc nhn li k t m bn gi cn gi bit n nm trong khong t a n z20. Cho bit r = 4, G = 10101. Hy tnh R trong gii thut CRC ca on k t DHCN E

B

A

F

C

D

1

4

5

1

3

3

3

2

1

2

2

2

E

B

A

F

C

D

2

1

2

1

1

1

2

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