Problem5

Part of a networking infrastructure consists of three routers R1, R2, and R3 and six networks N1 through N6, as shown in Figure 1. All address entries of each router are also given as seen in the figure. A packet with the destination IP address 195.25.17.3 arrives at router R1.

(a) Find the exact network ID field of each network in binary form. (b) Find the destination network for the packet (proof needed). (c) Specify how many hosts can be addressed in network N1

SEE THE ATTACHMENT

Figure 1

Problem 6.

A router with four output links L1, L2, L3, and L4 is set up based on the following routing table

SEE THE ATTACHMENT

:

The router has a masking pattern of 255.255.255.240 and examines each packet using the mask in order to find the right output link. For a packet addressed to each of the following destinations, specify which output link is found:

(a) 192.5.150.18 (b) 129.95.39.10 (c) 129.95.38.15 (d) 129.95.38.149

Problem 7.

A company has three LANs with 500 nodes each. Explain how many of the IP addresses the company uses up if it selects:

(a) Three class B networks. (b) One class B network with subnetting. (c) CIDR addressing.

Justify your answers by describing each addressing scheme

11 195.25.16.0/20 L12 95.25.8.0/22 L13 135.11.2.0/22 L14 R1 Table Entry Link R2 Table Entry Link R3 Table Entry Link 195.25.24.0/1921 195.25.16.0/20 L22 195.25.8.0/22 L23 11.5.0.0/21 L31 Else 95.25.16.0/20 L33 32 N1 N3 N5 11 21 31 Packet R1 12 R2 22 R3 32 13 23 33 N2 N4 N6 Figure 1 11 195.25.16.0/20 L12 95.25.8.0/22 L13 135.11.2.0/22 L14 R1 Table Entry Link R2 Table Entry Link R3 Table Entry Link 195.25.24.0/1921 195.25.16.0/20 L22 195.25.8.0/22 L23 11.5.0.0/21 L31 Else 95.25.16.0/20 L33 32 N1 N3 N5 11 21 31 Packet R1 12 R2 22 R3 32 13 23 33 N2 N4 N6 Figure 1