S-38.188 exam, 8.9.2005

General comments about the grading

Problem 1:

correct acronym gives 0.5p and a short explanation 0.5p
some minor errors were tolerated in the acronyms (for example, one of the letters of the acronym could be false without penalty), as long as the explanation was correct

Problem 2:

CIDR + explanation why (2p)
forwarding explanation (address format, AND(IP_addr, prefix), longest match -rule) (2p)
BGP-4 explanation (BGP speakers, paths distributed as AS-nr lists, goal: loopless paths!) 2p

Problem 3:

slow start + AIMD explanation (2p)
congestion avoidance = (mostly) router based mechanisms to indicate TCP sources about increasing congestion (1p)
RED description (1p)

Problem 4:

slides 81 and 84 (lecture 12)
reasons for using NAT (2p)
problems with NAT (2p)

Problem 5:

DNS + why (1p)
domain hierarchy (1p)
DNS functionality (2p)

Problem 6:

a) explanation of MIME (1p), SMTP/TCP relaying from server to another, POP/IMAP to read email (2p)
b) authentication (1p), integrity (1p), secure hash function (0.5p), public key cryptography = RSA (0.5p)

Valitustilaisuus

A "valitustilaisuus" will be arranged for questions about the grading. The time and place is:

Friday, October 7, at 10-11 o'clock, room E312.

Results

S-38.188 Computer Networks - spring 2005

Exam 08.09.2005 16:00-19:00 S4

	T1	T2	T3	T4	T5	T6	Total	Exam	Project	Final
47596B	4	2,5	4	3	2	5,5	21	3	0	3
51453B	5	1	3	1	2	5	17	2	1	3
51747M	2,5	1	2	4	0,5	3,5	14	1	-1	1
51875F	4	3,5	3	1,5	4	2	18	2	0	2
52058V	4,5	3	0,5	1,5	2	2,5	14	1	0	1
52085H	5	3,5	2,5	4	2	4	21	3	0	3
53013D	4	0	0	1	0	3	8	0	0	0
54246B	4,5	4	3,5	0,5	3	5	21	3	0	3
54249E	4,5	2	3,5	0	3	3,5	17	2		2
54366J	5	3	3,5	1	3	6	22	3	0	3
54627C	4,5	3	4	3	4	5,5	24	4	0	4
54719W	3,5	2	3	2	2,5	5,5	19	2	0	2
54874C	6	3	4	1	4	4	22	3	0	3
54887T	4	4,5	3,5	2	3,5	3	21	3	-1	2
55072M	5	3	3,5	4	4	3,5	23	4	-1	3
55605N	3,5	0,5	2,5	1	2	1,5	11	0	0	0
57676N	3	2	4	1	2,5	3	16	1	1	2
58137U	1,5	2	4	3,5	3,5	0,5	15	1	-1	1
58286R	6	5	3,5	2	2,5	5,5	25	4	1	5
58591S	5	3	4	4	4	4,5	25	4	0	4
60606T	6	5	3,5	3	4	5,5	27	5	0	5
60612C	3	4	3	1,5	2,5	5,5	20	3	0	3
60870R	4	4,5	2	0	1,5	3	15	1	-1	1
61144M	5,5	5,5	4	3	4	6	28	5	0	5
61328T	2,5	2	2	4	1,5	0	12	0	-1	0
63522F	3	2,5	3	1	2	4,5	16	1	0	1
65209B	3,5	2	3,5	0	2	2	13	0	0	0
76276M	4	4,5	4	0	2	1	16	1	0	1
76753P	2	2	3,5	0	1	2	11	0	-1	0


Grading
1	14
2	17
3	20
4	23
5	26