Given the assigned block of IP addresses 194.99.64.0/18, a router 194.99.64.33 managing this block of IP addresses and connecting the network using this block of addresses to the rest of the internet, and the list of previously assigned networks (within that block of addresses) given below, answer each of the following questions.
PREVIOUSLY ASSIGNED NETWORKS
i) network 1 194.99.96.0/20
ii) network 2 194.99.72.0/21
iii) network 3 194.99.64.0/22
a) Consider a network with a net-mask consisting of 18 ones followed by 14 zeros.
How many bits are there in the netid for this network?
How many bits are there in the hostid for this network?
How many addresses are available in this network?
Are there any of these addresses that should not be used as addresses of hosts?
If so why?
b)What is the range of addresses available in each of the previously assigned
networks? How many hosts can be supported by each of the three previously assigned networks?
c) A CIDR network has 2N addresses where N is the number of bits in the hostid. For N=12 what base addresses can be chosen for CIDR networks between 194.99.0.0 and 194.99.128.0.
d) Your job is to assign blocks of addresses based on CIDR. Group 1, group2 and group3 above have already been allocated from your block. Two further requests have been made, one for 800 hosts and one for 3500 hosts. What is the most efficient way to fill these two requests? You must allocate from the remaining addresses (not including the addresses already allocated to group 1, group 2, and group 3).
e) Consider that there is one router connected to all the networks within the address block 194.99.64.0/18. What entries would be placed in that routing table of this router to forward packets arriving from outside the address block 194.99.64.0/18 to the correct network within the address block 194.99.64.0/18? For each routing table entry give network address, gateway address, mask and interface for each network. Consider entries for each of
the preexisting networks and each of the networks you added.
f) Consider a router outside the address block 194.99.64.0/18. What entry or entries would be needed in this router's routing table to forward packet to the networks within the address block 194.99.64.0/18? Give the minimum number of entries that could be used in this external router to reach all hosts in the address block 194.99.64.0/18.