Midterm, CIS656, 02/21/2004 Use only the paper provided by Dr Ott. Name on every sheet. Save margin for Mr Jain! Black and Blue Pen/Pencil only. 1. Make a drawing of an IP Header. For each field, give size and a SHORT explanation of its use, role, or function. Where appropriate, give the units in which the content is expressed. (like liters, meters, bits, pounds per square inch, etc). For problems 2, 3, study the following two outputs: arp output (part was erased to save paper): argerich-244 ott>: arp -a Net to Media Table: IPv4 Device IP Address Mask Flags Phys Addr ------ -------------------- --------------- ----- --------------- eri0 dhcp-207-32 255.255.255.255 00:c0:4f:a0:ab:c7 eri0 megalon 255.255.255.255 08:00:20:c4:86:8d eri0 dhcp-207-14 255.255.255.255 00:c0:4f:a0:ab:fe eri0 dhcp-207-16 255.255.255.255 00:c0:4f:a0:ab:ac eri0 argerich 255.255.255.255 SP 00:03:ba:02:83:fc eri0 BASE-ADDRESS.MCAST.NET 240.0.0.0 SM 01:00:5e:00:00:00 traceroute output: maan-505 ott>: traceroute argerich traceroute to argerich.njit.edu (128.235.204.109), 30 hops max, 40 byte packets 1 cisnet-gw5 (128.235.32.5) 1.337 ms 0.424 ms 0.407 ms 2 argerich (128.235.204.109) 0.447 ms 0.431 ms 0.404 ms 2. What is the physical address of the computer with IP address 128.235.204.109 ? VERY briefly explain your answer. 3. Are maan.njit.edu and argerich.njit.edu on the same subnetwork? VERY briefly explain your answer. 4. Suppose we have a (sub)-network 128.235.32.0/21 Which of the following addresses can be the address of a host on that network? (Each yes (it can) or no (it can not), with SHORT explanation. Like: ``first difference is in the bit number 27, and 27 < 32''. Or a drawing with arrows and/or circles. Bits are numbered 0 , 1 , ... , 31 . Convince us you did not just guess.) (i) 129.235.32.1 (ii) 128.234.32.2 (iii) 128.235.33.3 (iv) 128.235.34.4 (v) 128.235.35.5 (vi) 128.235.35.255 (vii) 128.235.39.254 (viii) 128.235.40.253 (ix) 255.255.255.255 (x) 128.235.39.255