Networking An organization has been assigned the network number 128.59.48.0/20 a

ID: 3830926 • Letter: N

Question

Networking

An organization has been assigned the network number 128.59.48.0/20 and it needs to create IP subnets that support up to 1020 hosts on each subnet. (a) What is the maximum number of subnets that can be set up? Explain your answer. (b) Suppose a single router connects all subnets (whose number you found in (a)), where each router port is connected to a different subnet. In the following table, fill in the routing table of the router. Note that you should fill the routing table with the smallest possible number of entries (some rows in the table that follows may remain empty)

Explanation / Answer

2(a). 26 = 64 subnets

this is class B address.

NID.NID.HID.HID ------ 8.8.8.8

16 bits are used for network address and 16 bits are host addresses.

We need 1020 hots on each subnet.

From host 16 bits 6 bits are used for subnet 10 bits are used for host address.

26 = 64 subnets. The Number Of Available addresses 1024 and usable host address are 1022.(210-2=1022).

Subnet0:128.59.0.0 To 128.59.252.0(64 subnets)

2(b) Subnet0: 128.59.48.0 To 128.59.252.0(54 subnets)

Destination Network

Next hop

128.59.48.0

128.59.48.1

128.59.52.0

128.59.52.1

128.59.56.0

128.59.56.1

128.59.60.0

128.59.60.1

128.59.64.0

128.59.64.1

128.59.68.0

128.59.68.1

128.59.72.0

128.59.72.1

128.59.76.0

128.59.76.1

128.59.80.0

128.59.80.1

128.59.84.0

128.59.84.1

128.59.88.0

128.59.88.1

128.59.92.0

128.59.92.1

128.59.96.0

128.59.96.1

128.59.100.0

128.59.100.1

128.59.104.0

128.59.104.1

128.59.108.0

128.59.108.1

128.59.112.0

128.59.112.1

128.59.116.0

128.59.116.1

128.59.120.0

128.59.120.1

128.59.124.0

128.59.124.1

128.59.128.0

128.59.128.1

128.59.132.0

128.59.132.1

128.59.136.0

128.59.136.1

128.59.140.0

128.59.140.1

128.59.144.0

128.59.144.1

128.59.148.0

128.59.148.1

128.59.152.0

128.59.152.1

128.59.156.0

128.59.156.1

128.59.160.0

128.59.160.1

128.59.164.0

128.59.164.1

128.59.168.0

128.59.168.1

128.59.172.0

128.59.172.1

128.59.176.0

128.59.176.1

128.59.180.0

128.59.180.1

128.59.184.0

128.59.184.1

128.59.188.0

128.59.188.1

128.59.192.0

128.59.192.1

128.59.196.0

128.59.196.1

128.59.200.0

128.59.200.1

128.59.204.0

128.59.204.1

128.59.208.0

128.59.208.1

128.59.212.0

128.59.212.1

128.59.216.0

128.59.216.1

128.59.220.0

128.59.220.1

128.59.224.0

128.59.224.1

128.59.228.0

128.59.228.1

128.59.232.0

128.59.232.1

128.59.236.0

128.59.236.1

128.59.240.0

128.59.240.1

128.59.244.0

128.59.244.1

128.59.248.0

128.59.248.1

128.59.252.0

128.59.252.1