Computing 205/406 & IT8
Tutorial #7
- The
following are some (possibly hypothetical) IP addresses:
205.184.10.20 48.55.190.88 10.170.45.56
149.144.20.82 192.54.252.7 128.250.150
Extract the network number and the host number from each of these, stating
what class of network it is. Note that the last one is not a typing error.
- What[1] is the chief difference between the IP addressing scheme and the
International (and Australian) telephone numbering scheme?
- One of the weaknesses of the IP addressing scheme is that when a machine is
physically moved from one network to another, its address must change. Why
is this so, and why is it a problem?
- We have seen that the address with all 1Ős in the host part is used as the IP
broadcast address. What do you think the address with all 0Ős in the host part is
used for?
- The class-B networks in Q.1 are to use subnetting, with a netmask of
255.255.255.0. What are the subnet and host parts of the addresses? What
is the broadcast address in each case? (Harder) What if the netmask were
255.255.255.128?
- We have seen the broadcast address format where subnetting is used. What
happens if the system administrator makes a mistake, and doesnŐt set up
subnetting correctly on one of the hosts in a subnet?
Practical exercises:
[1] From Comer, Internetworking with TCP/IP, Vol 1, 3rd Ed, P.71
This tutorial is also available in PostScript format.
Phil Scott