NAME: CIS456 Quiz 02/03/04 Use this paper and the paper Dr Ott provides. No other paper. Put your name on every sheet. Black and Blue pen and pencil only. 4:05 to 4:20 Strictly! 1. What does ARP stand for? Address Resolution Protocol 2. What does CRC stand for? Cyclic Redundancy Check 3. NJIT has a ``subnetwork'' (actually, a ``VLAN'') with adress space 128.235.32.0/22 . Which of the following addresses can be the IP address of an interface on this subnet? For each, answer yes (it can be) or no (it can't be) AND give a VERY SHORT explanation. For example, write out the binary form of the address and point at or circle the critical (right or wrong) part. Or ``no, because the zeroth bit is wrong'' or ``yes, because the first 27 bits are the same, and 27 < 29''. Or so. To save you time: 235 = 1110 1011 in binary. (235 = 128 + 64 + 32 + 8 + 2 + 1). In Binary, the address space of the VLAN is 1000 0000 1110 1011 0010 00(further ``anything'') A. 129.235.32.8 No. Best argument: there is a difference in one of the bits 0 - 7. Also OK: the address is 1000 0001 1110 1011 0010 0000 0000 1000 ^ so bit number 7 is wrong, and 7 < 22. B. 128.236.32.9 No. Best argument: there is a difference in one of the bits 8 - 15. Also OK: the address is 1000 0000 1110 1100 0010 0000 0000 1001 ^^^ so bits number 13, 14, 15 are wrong, and 13 < 22. C. 128.235.36.10 No. Now you have to be careful. the address is 1000 0000 1110 1011 0010 0100 0000 1010 ^ so bit number 21 is wrong, and 21 < 22. (Or make a drawing and point or circle). D. 128.235.32.11 Yes. The difference is only among bits 24 - 31. E. 128.235.33.12 Yes. The first difference is in bit number 23, and 23 > 21. F. 128.235.35.13 Yes. The first difference is in bit number 22, and 22 = 22 (!). (Don't forget: because we are computer scientists, bit number 22 has 22 bits ``before it'' and (32 - 22 - 1) bits ``after it'' in the address. G. 128.235.35.255 No. This is the ``directed broadcast'' address on the VLAN. It can not be the address of an interface on this network. (It CAN occur in a packet, but then only as destination address). Quiz 1 was on 02/03/04. It was announced in advance in class. Henceforth, quizes will not be announced in advance. The next quiz will probably be either on 02/10 or 02/13, with a tiny chance it will get delayed to 02/17. Quiz number 2 will be cumulative: all material from day zero until the day of the quiz, including reading for the day of the quiz and homework for the day of the quiz. Further: Quiz n will be on material from the day of quiz (n-2) until the day of quiz n: All material done in class any of these days, or assigned for any of these days.