In the partial network topology shown below, a well-formed IP datagram with a so
ID: 3573239 • Letter: I
Question
In the partial network topology shown below, a well-formed IP datagram with a source IP of 144.27.8.25 and a destination IP of 128.2.19.5 arrives at router1 via the external link. Link 1 uses the subnet 128.2.17.34/31 and Link 2 has the subnet 128.2. 19.0/25. The hosts and routers on the Ethernet subnet are all connected to their own port on an Ethernet switch. host3 eth0 ost4 etho 128.2.19 bb: 2:64 11 C4:a External Link subnet 1 Link 1 router1 eth1: 128.2.17.34 Link 2 de: a4:fe: 03:4d:8a Ethemet Switch 1 router2 eth0: router2 ethl 128.2.17.35 128.2.19.1 de: a4:fe: 03:2c:4f c4:a8:6e:32:cc:7b host2 eth0 128.2.19.5 128.2.19.4 c4:a8:6b: 10:4b:c9 a) Suppose all ARP tables are up to date. Considering all the steps involved in delivering this datagram (from the outside to 128.2.19.5) to the destination host, answer the questions below. i. (4 pts) Router l gets the IP datagram, it then checks the forwarding table for the entry to be used, shown below. The adapter in router l then creates an Ethernet frame and sends out via its interface eth1.Explanation / Answer
a) i. source Ip : 144.27.8.25, destination IP : 128.2.19.5, source mac: de:a4:fe:03:4d:8a, destinantion mac: de:a4:fe:03:2c:4f
ii. source Ip : 144.27.8.25, destination IP : 128.2.19.5, source mac: de:a4:fe:03:2c:4f, destinantion mac: c4:a8:6b:1f:a5:32
iii MAC = c4:a8:6b:1f:a5:32 interface = 5
b) i. source mac: de:a4:fe:03:2c:4f, destinantion mac: ff:ff:ff:ff:ff:ff
ii) swith will flood packets through all it interfaces as the host respond it will update it MAC table
iii) source mac: c4:a8:6b:1f:a5:32, destinantion mac: de:a4:fe:03:2c:4f
iv) it updates it mac table as c4:a8:6b:1f:a5:32,5 and when it first received de:a4:fe:03:2c:4f it has already updated the mac as de:a4:fe:03:2c:4f,1. it forwards the packet to router2 through 1
v) it forwards to interface 5 as it already updated its mac table
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