Question

Given assigned block of IP addresses 194.99.64.0/18, a router 194.99.64.33 managing this block of IP addresses and connecting network using this block of addresses to the rest of internet, and the list of earlier assigned networks (within that block of addresses) given below, answer each of 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 have to not be used as addresses of hosts?

If so why?

b) What is the variety of addresses available in each of 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 elected for CIDR networks between 194.99.0.0 and 194.99.128.0.

d) Your job is to allocate 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 most competent way to fill these two requests? You have to allocate from remaining addresses (not including the addresses already allocated to group 1, group 2, and group 3).

e) Consider that there is one router associated 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 access give network address, gateway address, mask and interface for each network. Consider entries for each of the pre existing networks and each of the networks you added.

f) Consider a router outside address block 194.99.64.0/18. What entry or entries would be essential in this router's routing table to forward packet to the networks within the address block 194.99.64.0/18? Give 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.