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Consider the network in Figure 1 . It represents a small corporate network. The IP addresses are shown explicitly; M 1 to M 1 2

Consider the network in Figure 1. It represents a small corporate network. The IP addresses are shown
explicitly; M1 to M12 mean MAC addresses. B1, B2 and B3 are bridges; R1, R2 and R3 are routers.
Figure1. A small corporate network. D3 is the DNS server for this network. The machines C1, D1, C2, D2, and C3 are configured with
DNS server address =192.168.1.52.
All interfaces that have IP addresses of the form 192.168.x.y are configured with netmask =
255.255.255.240.
The default gateways are configured as follows
at C1 and D1: 192.168.1.17
at C2 and D2: 192.168.1.33
at C3 and D3: 192.168.1.49
1. What IP address and netmask should we give to M12?
with reliable service.
connection-oriented or connectionless service?
Explain.
2/5
shown
..........................................................................................................................................
..........................................................................................................................................
2. In the following table, write the routing tables after RIP has stabilized. (Give only
the entries for destination prefixes that are
3. We reconfigure the network as shown in Figure 2. The interfaces at M4, M8 and M12 are not
used. We change the network mask to 255.255.255.0 on all systems, the IP addresses remain the
same. We do a ping from C1 to C2, C2 to C3 and C3 to C1. Packet sniffers are placed at locations
labeled 1,2 and 3 on the figure.
Figure2. A small corporate
In the table below, mark the values of the fields that are read in the ping packets
corresponding to each of the ping exchanges if the packet is visible at this location.
Consider only the ping packets themselves, not the replies.
not on-link with this router.)
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