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Networking A few questions on the course A few questions about the course.

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Presentation on theme: "Networking A few questions on the course A few questions about the course."— Presentation transcript:

1 Networking A few questions on the course A few questions about the course

2 The Director of Studies is A.Alwyn Barry B.James Davenport C.Alan Hayes D.Mickey Mouse

3 That was the warmup I hope you got Alan Hayes: James Davenport is so last year! Alwyn Barry is just history (as far as this job is concerned!)

4 Questions on the course (mostly factual, but there is more to the course than facts)

5 An Ethernet address is how long? A.4 bytes B.6 bytes C.16 bytes D.Variable length

6 The answer is B (6 bytes) If you didnt get that, youre pretty confused: re-read sections 2.2 and 3.2 of the book.

7 100 Mbps twisted pair length limit is A.60 metres B.100 metres C.195 metres D.500 metres

8 The correct answer is B: 100m However, this is the sort of factual answer: a)I dont expect you to know, and would give you in an exam question; b)You should always check in real life, especially if equipment installation depends on it; c)As I showed in the Library, isnt what it seems in practice

9 Internet and Ethernet A.An internet is impossible without Ethernet B.The Internet needs Ethernet C.Todays Internet depends on Ethernet D.Totally independent concepts

10 I hope that made you think A.Certainly false B.Was false in the beginning, and may well be false again. C.True in practice today. D.True, but not as helpful as C.

11 When it comes to END characters, PPP 1.Is better than SLIP, as it doesnt use one 2.Has one, which cant be used in IP 3.Allows it in the middle of IP packets 4.Allows it anywhere in IP packets

12 The correct answer is D: anywhere in IP packets Since PPP doesnt have a length field, it must have some END marker IP can contain arbitrary binary data, so B and C cant be right. If there is an END character in the IP packet, it is escaped by the sending PPP, and re-interpreted by the receiver See figure 2.2

13 When it comes to delivering packets, IP A.Guarantees to deliver B.Guarantees to deliver or return an ICMP error C.Makes no guarantees

14 The answer is C On Ethernets, you have no idea if the packet is received Congested routers may just drop packets No error is generated for header checksum errors No error is generated for broadcast or multicast packets Etc.

15 The system administrator decides on the routing mechanism 1.True 2.False

16 False There is only one routing mechanism: see Stevens sections 9.1, 9.2. Who confused routing mechanism with policy?

17 The manager of an autonomous system in the Internet A.Can do whatever he likes B.Must implement the routing policy of whoever his AS is connected to C.Must satisfy the constraints of whoever his AS is connected to D.Depends on whether its stub/transit

18 A.True, but he may not stay connected to the Internet for very long. B.It would be rare to be told what routing policy to implement. C.Yes, such constraints must be satisfied. D.In theory no, but in practice a transit AS will have many more constraints.

19 Networking A few questions on the course A few questions about the course

20 The textbook is a fantastic resource A.Strongly Agree B.Agree C.Neutral D.Disagree E.Strongly Disagree

21 Actually, I use other sources A.Strongly Agree B.Agree C.Neutral D.Disagree E.Strongly Disagree

22 My principal other source is A.Bradfords book B.Farouzans book C.Other book D.Wikipedia E.Other on-line non- book sources F.A mixture G.No other source

23 If you had other Then you can tell us. Text to

24 The lecturer uses the textbook far too much in lectures A.Strongly Agree B.Agree C.Neutral D.Disagree E.Strongly Disagree

25 What about this technology A.Revolutionises problem classes B.Useful extra, but shouldnt dominate C.OK 1-2 times/term D.Never again E.Abstain


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